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鉄と鋼
Vol. 81 (1995), No. 3

鉄と鋼 Vol. 81 (1995), No. 3

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オンライン版ISSN:	1883-2954
冊子版ISSN:	0021-1575
発行機関:	The Iron and Steel Institute of Japan

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キーワードランキング

21 Nov. (Last 30 Days)

鉄と鋼 Vol. 81 (1995), No. 3

Relationships between Microstructure and Mechanical Properties in Steels

Minoru UMEMOTO

pp. 157-166

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Effect of Ar Bubbling on Removal Rate of Alumina Inclusion in Al Deoxidized Steel

Jeong-Sik KIM, Masahiro KAWAKAMI, Kouji TANIDA

pp. 167-172

抄録

Effect of Ar bubbling on the deoxidation rate of molten steel with Al has been investigated in 20 kg scale induction furnace. The results are summarized as :
(1) The deoxidation was completed within 5 to 15 min depending on experimental conditions. The final total oxygen content was 30 to 45 ppm.
(2) The deoxidation model has been proposed in which deoxidation rate should be determined by the balance of removal and reentrainment rates of alumina inclusion.
(3) The removal rate constant was obtained at each condition. The apparent activation energy was obtained as 284, 355, 368 kJ/mol, respectively with Ar flow rate of 0, 5, 10 l(STP)/min.
(4) The removal rate constant was expressed as a function of total stirring energy density for induction stirring(ε_ind)and Ar gas stirring(ε_B/B), namely, k=k₁(ε_ind+ε_B/B)ⁿ.The value of n was obtained as 0.50 to 0.65.
(5) The contribution of entrapment of inclusion in bubbles was estimated quantitatively. The transfer coefficient of inclusion migration to bubble was also estimated.

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Cold Model Experiments on the Enhancement of Scrap Melting in a Bath Accompanied by Gas Injection

Manabu IGUCHI, Masaki SHINKAWA, Zen-ichiro MORITA

pp. 173-178

抄録

A fundamental study based upon an aqueous system was carried out to reveal the effect of gas injection on the melting rate of solid bodies such as scrap. Ice spheres and ice cylinders were used as models of solid metals for the aqueous system. As the first step, the melting behavior of a single ice sphere or cylinder in a water bath was observed in this study using a high-speed video camera and by eye inspection. The melting rate of the ice was highly increased with an increase in gas flow rate. An estimation method of the melting time of the ice was proposed. Measured values of the melting time were found to compare well with estimated ones. The estimation method of the melting time originally proposed for the aqueous system was applicable to Wood's metal systems by adding time required for a solid Wood's metal sphere or cylinder to be heated up to its melting point.

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Levitation and Heating of Metallic Ball in Cold Crucible Simultaneously Supplied with Two Frequencies

Kazuyuki SAKURAYA, Toshiaki WATANABE, Satoshi IWASAKI, Akira FUKUZAWA, Motoo YAMAZAKI, Tatsuo TAKE, Michiru FUJITA

pp. 179-184

抄録

The levitation forces working toward the metallic ball in the cold crucible and the temperature rise of the metallic ball were measured under supplying two different frequencies (3kHz and 30kHz) simultaneously with the object of the optimum operation of the cold crucible type levitation melting. The results obtained are as follows.
(1) The levitation forces supplied by two frequencies take additional values of 3kHz and 30kHz which are supplied independently.
(2) The behavior of temperature rise of the metallic ball in the case of supplying two frequencies are almost equivalent to additive behavior of 3kHz and 30kHz power supplying independently.
A new control technique for levitation melting where rather lower frequency is mainly allotted for levitation and higher frequency is mainly allotted for heating has been suggested by the above stated results.

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Influence of Heating Temperature and Strain on Surface Crack in Carbon Steel Induced by Residual Copper

Toshiyuki KAJITANI, Masamitsu WAKOH, Naoki TOKUMITSU, Shigeaki OGIBAYASHI, Shozo MIZOGUCHI

pp. 185-190

抄録

Mechanism of surface crack formation of steel induced by residual copper (Cu) is investigated using a new technique of Greeble test. Two kinds of experiments were carried out, to clarify the effect of temperature and to understand the behavior of crack growth. Crack is caused by liquid Cu, which precipitates at steel-scale interface during oxidation. However, no crack formed at higher temperature. Micro analysis indicates that it is due to the formation of liquid scale above eutectic temperature of FeO-2FeO·SiO₂. Liquid Cu-precipitates are trapped in the liquid scale area, and they cannot penetrate into austenite grain boundaries. The fact that silicon addition reduces the crack formation also supports this mechanism.
Deformation test with various strains reveals that there exist two stages in the behavior of crack growth. At the firststage, crack grows deeper, because liquid Cu penetrates into the boundary. The crack stops growing along the depth direction and opens its width in the second stage, because of the lack of liquid Cu. That means the amount of Cu-precipitates decides the crack depth.

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Effect of Copper Content on Mechanical Properties of Continuously Annealed Extra-low-carbon Titanium-added Steel Sheets

鉄と鋼 Vol.76(1990), No.5

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Development of Accurate Temperature Control in Hot Strip Mill

Takashi ODA, Yoshitaka KONDO, Seiji KONISHI, Hironori MURAKAMI, Masayoshi SUEHIRO, Toshiki YABUTA

pp. 191-196

抄録

A temperature control of hot strips on the run-out table due to a proper cooling plays a significant role for controlling their mechanical properties. For high carbon steels, for example, the temperature control is quite difficult because of a remarkable heat development (thermal generation) caused by latent heat of pearlite transformation. To realize required temperature control, a simplified metallurgical online model has been developed which predicts the transformation behavior and the resultant heat development. In this model, history of removed thermal energy during cooling process has been introduced instead of conventional temperature history. As a result, high accuracy has been realized on special steel without any human intervention to cooling control system.

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On-line Measurement of Work Roll Profile in a Hot Strip Finishing Mill

鉄と鋼 Vol.79(1993), No.7

5.計測・制卸

鉄と鋼 Vol.81(1995), No.4

A Kinetic Model for Phase Transformations of Low Carbon Steels during Continuous Cooling

鉄と鋼 Vol.73(1987), No.8

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Precipitation Behaviour of Titanium Carbo-sulfide in Extra-low-carbon Titanium-added Steels

Katsumi YAMADA, Masakazu NIIKURA

pp. 197-202

抄録

Precipitation behaviour of titanium carbo-sulfide in extra-low-carbon titanium-added steels was studied in detail by Transmission Electron Microscopy (TEM).
Co-precipitation of TiS and MnS was observed to form in chain-like groups at austenite grain boundaries during holding the specimen at 950°Cafter reheating at 1250°C. This seemed to result from preferential precipitation at interfaces with the help of preceding grain boundary of S. On the other hand, hot working at 950°C suppressed the co-precipitation of TiS and MnS at austenite grain boundaries through recrystallization, and enhanced the strain-induced Ti₄C₂S₂ homogeneous precipitation within austenite grains. In the case of reheating at 1250°C followed by holding at 950°C, and then keeping at 700°C, co-precipitated TiS and MnS at prior austenite grain boundaries gradually changed to Ti₄C₂S₂ with the keeping time, and also fine precipitation of Ti₄C₂S₂ additionally occurred within ferrite grains.

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Strengthening Mechanisms of Ti and Nb Bearing Steel Plates Produced by Thermomechanical Control Process

鉄と鋼 Vol.82(1996), No.6

Influence of Ti and N on Strength and Toughness of 780MPa Class Steels and Their Simulated HAZ Toughness

鉄と鋼 Vol.83(1997), No.3

Rate of Dephosphorization of Liquid Iron by Solid Lime

鉄と鋼 Vol.58(1972), No.14

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Effects of Alloying Elements and Oxygen Potential on Equilibrium Carbon Content in Gas Carburizing

Nobuhiro MURAI, Terutaka TSUMURA, Mitsuhiro HASEBE

pp. 203-208

抄録

In order to control the surface carbon content of gas-carburized steels, the effects of alloying elements on equilibrium carbon content of low alloy steels based on JIS SCr420 grade were investigated. 1.0mm and 0.3mm thick specimens were carburized for 108ks or 288ks. As the carburizing time was long, the carbon content of the specimens deviated from the equilibrium value based only on the carbon potential in the atmosphere while excluding oxygen potential. The deviation was affected by Si, Cr, V content which are oxidized in the surface layer.
These results show that the equilibrium carbon content in gas carburizing atmosphere is also affected by oxygen potential in the atmosphere ; i.e. surface oxidaiton of alloying elements decrease the amount of the alloying elements in austenite, which changes the activity coefficient of carbon. Furthermore it is indicated that the growth of oxide results in re-carburization or decarburization. Therefore, oxygen potential in gas carburizing atmosphere is one of the important variables affecting the surface carbon content of gas-carburized steels.

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Fracture Toughness in the Transition Region of a Carbon Steel and a Ferritic Nodular Cast Iron

Keishi NAKANO, Takashi YASUNAKA

pp. 209-213

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In order to characterize the fracture toughness in the ductile-brittle transition region for thick-walled cylinders of ASME SA350 Gr.LF5 carbon steel and JIS FCD300LT ferritic nodular cast iron, elastic-plastic fracture toughness tests were carried out. The specimens were fatigue precracked compact tension (CT) specimens of 25mm in thickness. The tensile testing machines used were Instron type, electrohydraulic type and drop-weight type ones.
In the static fracture toughness test on a FCD300LT cast iron. CT specimens were often fractured at somewhat higher loads after the initiation of pop-in cracks. Although the scatter of pop-in fracture toughness was small, the values of critical J-integral at the unstable brittle fracture scattered largely.
In the transition region of SA350 steel, the initiation of pop-in crack was not observed, and fracture toughness scattered largely.
At the propagation of the unstable crack near the transition temperature, the Weibull distribution provides good fits for the critical CTOD and the critical J-integral. This distribution can be mainly interpreted by the scatter of the distance between the precrack tip and the origin of unstable brittle fracture.

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Long-term Creep Strength Property and Microstructural Stability of 12Cr Steel

Hideaki KUSHIMA, Kazuhiro KIMURA, Koichi YAGI, Kouichi MARUYAMA

pp. 214-219

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Heat-to-heat variation of long-term creep strength property observed for 12Cr steel was investigated from viewpoints of creep deformation behaviour and stability of microstructure. Heat-to-heat variations of creep deformation behaviour and creep rupture strength properties were described by the differences in the parameter α in a modifiedθprojection method which indicates the acceleration in creep rate at the tertiary stage. It was shown that the magnitude of α and its change with creep depend on the morphology and stability of initial microstructure, and correlate with microstructural changes accompanied by recovery and recrystallization under tertiary creep. It is concluded therefore that the creep strength and rupture life can be controlled by the microstructure and its stability of 12Cr steels and expressed only by the rate constant α.

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Collective Evaluation of Temperature and Stress Dependence of Creep Rupture Life in Austenitic Stainless Steels

Hideo NAKAKUKI, Kouichi MARUYAMA, Hiroshi OIKAWA, Koichi YAGI

pp. 220-224

抄録

Temperature and stress dependence of creep rupture life was examined on 24 heats of type 304, 316, 321 and 347 stainless steels. Collective evaluation of the results indicated the existence of three regions, H, M and L, with different activation energy, Q, and stress exponent, n, for rupture life : region H at a shorter rupture life, region L at a longer rupture life, and region M in between the two regions. The values of Q and n decrease with increasing rupture life as expected from creep fracture theories, suggesting that a longer rupture life than the actual value would be predicted erroneously if it is estimated from the short term data taking the high values of Q.
Transgranular and intergranular fracture take place respectively in the regions H and M, and the fracture process in the two regions is controlled by creep deformation. The intergranular fracture in the region L starts from cavities nucleated at sigma-phase/matrix interfaces, and this fracture process is controlled by grain boundary diffusion. The changes in Q and n coincide fairly well with the changes in creep mechanism. This fact points out that the changes in Q and n are inherent to the austenitic stainless steels and the same thing will happen in any materials similar to the four types of stainless steels.

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Resistance against the Stable Crack Growth and Brittle Fracture Initiation Site Controlling the Ductile-Brittle Fracture Transition Behaviors of Low Carbon Steels

Tsuyoshi YAGI, Akihiro ITOH, Michihiko NAGUMO

pp. 225-230

抄録

The fracture process of low carbon steels have been investigated by means of a fracture mechanics test and microscopic observations. Three steels with characteristic differences in the ductile-brittle transition behaviors such as the transition temperature, R-curve and brittle fracture initiation stage are employed. A new microstructural parameter, the constraint factor, is defined to take into account the constraint of plastic deformation by grain boundary carbides. The constraint factor is successfully correlated with the resistance against the stable crack growth. The crack tip field is analyzed in terms of the elastic-plastic analyses in terms of J/σ_y and COD, and the elastic-plastic analyses are found to be applicable at the ductile-brittle transition region. The brittle fracture initiation is controlled either by the local stress or by the local strain for respective steels. The constraint factor is also correlated with the location of the brittle fracture initiation sites. The estimated local stress at the brittle fracture initiation site shows a unique temperature dependence irrespective of the microstructure of steels. It is suggested that the nucleation of an incipient crack at the brittle initiation site is microstructure dependent through a local deformation behaviors.

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応力集中部を有するパイプライン用鋼X80における水素起因擬へき開割れの発生・進展挙動

鉄と鋼 Vol.106(2020), No.9

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Quality Evaluation of Line Pipes by the Chevron Notched Drop Weight Tear Test

Takahiro KUBO, Toyoaki SHIWAKU, Joe KONDO, Hideki MIYAZAKI, Yoshiaki KAWAGUCHI

pp. 231-236

抄録

The WG in High Strength Line Pipe Research Subcommittee of Steel Pipes and Tubes Committee of The Joint Research Society of ISIJ investigated the applicability of the Chevron Notched Drop Weight Tear Test to Japanese high toughness line pipes, and developed a new test method, i.e., the Slit Chevron Notched Drop Weight Tear Test. The effects of the slit width and the notch angle of the specimen was investigated in details, and the established method was verified by the burst tests on actual pipes.The fracture appearance transition temperature of the established test is a little safe side estimation to the brittle fracture of line pipes, and the impact energy of the test gives the prediction to the ductile crack propagation and arrest in natural gas transmission pipelines. It is expected that the developed method serves for the quality evaluation of high toughness line pipes against brittle fracture and ductile crack propagation and arrest.

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Environmental Effect on the Ductile-Brittle Transition of High Purity As-rolled Chromium

Yoshihisa MATSUMOTO, Masahiko MORINAGA, Tomonori NAMBU, Junso FUKUMORI, Takashi SAKAKI

pp. 237-242

抄録

Effect of environment on ductile-brittle transition of high purity as-rolled chromium were experimentally investigated using a small punch (SP) test in ten different atmospheres. The ductile-brittle transition temperature (DBTT) of pure chromium is sensitive to the test environment. DBTT under the environment of water or air is lower than that in vacuum. Also the ductility of chromium at room temperature in air is higher than that in a dry hydrogen gas atomosphere.
The values of the SP energy are higher in a wet gas atmosphere than that in a dry gas atmosphere. This result is contrary to the observation in high-strength steels or intermetallic compounds in which the ductility becames poorer when tested in a wet gas atmosphere.

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誌上討論

佐野正道, 井口学, 森田善一郎, 高梨智裕, 小川雄司, 徳光直樹

pp. 243-248

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Introduction to Reaction Kinetics for Material Processing (I)

Minoru SASABE

pp. N84-N94

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Capacities of Molten Slag

Kimihisa ITO

pp. N95-N100

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Equilibrium between Fe0-MnO-SiO₂ Slags and Molten Iron

鉄と鋼 Vol.51(1965), No.6

The Transfer of Carbon from a Gas Phase to Molten Iron

鉄と鋼 Vol.58(1972), No.2

Kinetics of Silicon Transfer from a Gas Phase to Molten Iron

鉄と鋼 Vol.58(1972), No.14

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論文アクセスランキング

21 Nov. (Last 30 Days)

In-situ Observation of Precipitation and Growth of MnS Inclusions during Solidification of a High Sulfur Steel

ISIJ International 早期公開
Measurement of Bubble Size Distribution and Generation Position of Bubbles Generated during Smelting Reduction of Iron Oxide-containing Slag

ISIJ International 早期公開
Injection of hydrogenous gases into the blast furnace tuyeres for reducing CO₂ emissions: a review

ISIJ International 早期公開
Development of a Low-carbon Sintering Process Technology and Its Application to a Pilot-scale Sintering Testing

ISIJ International Vol.64(2024), No.13
凝固過程における溶鋼中からAl₂O₃上へのMnSの晶出挙動

鉄と鋼早期公開
Molecular dynamics simulation of viscosity of the CaO, MgO and Al₂O₃ melts

ISIJ International 早期公開
Fe–(0.5–2.0)%Al–2.0%Mn合金の一方向凝固におけるAlNの晶出挙動に及ぼすAl濃度の影響

鉄と鋼早期公開
凝固過程のミクロ偏析による溶質濃度分布の定量的理解

鉄と鋼早期公開
SOKD: A soft optimization knowledge distillation scheme for surface defects identification of hot-rolled strip

ISIJ International 早期公開
Reduction and Carburization Behaviors of Iron Oxide Composite with Iron Carbide and Free Carbon

ISIJ International 早期公開

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鉄と鋼 Vol. 81 (1995), No. 3

キーワードランキング

reduction caco3 in electric furnace

kinetics of decarburization of liquid iron with high concentration ofcarbon

kinetics of decarburization of liquid iron by ar-coz gasmixture

ahss

charpy impact chemistry

dual phase steel

foamy slag in eaf

kinetics of decarburization of liquid iron by

ladle furnace flicker

scm440

鉄と鋼 Vol. 81 (1995), No. 3

Relationships between Microstructure and Mechanical Properties in Steels

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Effect of Ar Bubbling on Removal Rate of Alumina Inclusion in Al Deoxidized Steel

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Cold Model Experiments on the Enhancement of Scrap Melting in a Bath Accompanied by Gas Injection

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Levitation and Heating of Metallic Ball in Cold Crucible Simultaneously Supplied with Two Frequencies

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Influence of Heating Temperature and Strain on Surface Crack in Carbon Steel Induced by Residual Copper

SNSによる共有

Development of Accurate Temperature Control in Hot Strip Mill

SNSによる共有

Precipitation Behaviour of Titanium Carbo-sulfide in Extra-low-carbon Titanium-added Steels

SNSによる共有

Effects of Alloying Elements and Oxygen Potential on Equilibrium Carbon Content in Gas Carburizing

SNSによる共有

Fracture Toughness in the Transition Region of a Carbon Steel and a Ferritic Nodular Cast Iron

SNSによる共有

Long-term Creep Strength Property and Microstructural Stability of 12Cr Steel

SNSによる共有

Collective Evaluation of Temperature and Stress Dependence of Creep Rupture Life in Austenitic Stainless Steels

SNSによる共有

Resistance against the Stable Crack Growth and Brittle Fracture Initiation Site Controlling the Ductile-Brittle Fracture Transition Behaviors of Low Carbon Steels

SNSによる共有

Quality Evaluation of Line Pipes by the Chevron Notched Drop Weight Tear Test

SNSによる共有

Environmental Effect on the Ductile-Brittle Transition of High Purity As-rolled Chromium

SNSによる共有

誌上討論

SNSによる共有

Introduction to Reaction Kinetics for Material Processing (I)

SNSによる共有

Capacities of Molten Slag

SNSによる共有

論文アクセスランキング

In-situ Observation of Precipitation and Growth of MnS Inclusions during Solidification of a High Sulfur Steel

Measurement of Bubble Size Distribution and Generation Position of Bubbles Generated during Smelting Reduction of Iron Oxide-containing Slag

Injection of hydrogenous gases into the blast furnace tuyeres for reducing CO2 emissions: a review

Development of a Low-carbon Sintering Process Technology and Its Application to a Pilot-scale Sintering Testing

凝固過程における溶鋼中からAl2O3上へのMnSの晶出挙動

Molecular dynamics simulation of viscosity of the CaO, MgO and Al2O3 melts

Fe–(0.5–2.0)%Al–2.0%Mn合金の一方向凝固におけるAlNの晶出挙動に及ぼすAl濃度の影響

凝固過程のミクロ偏析による溶質濃度分布の定量的理解

SOKD: A soft optimization knowledge distillation scheme for surface defects identification of hot-rolled strip

Reduction and Carburization Behaviors of Iron Oxide Composite with Iron Carbide and Free Carbon

詳細検索

Injection of hydrogenous gases into the blast furnace tuyeres for reducing CO₂ emissions: a review

凝固過程における溶鋼中からAl₂O₃上へのMnSの晶出挙動

Molecular dynamics simulation of viscosity of the CaO, MgO and Al₂O₃ melts