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鉄と鋼
Vol. 81 (1995), No. 9

鉄と鋼 Vol. 81 (1995), No. 9

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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. 9

Revision of the Standard Method (JIS G 1253) for Spark Discharge Atomic Emission Spectromety of Iron and Steel

Akihiro ONO

pp. 869-875

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Oxidation of Aluminum in Molten Iron by Impurity Oxygen in Argon

Minoru SASABE, Yoshinori AKIYAMA

pp. 876-881

抄録

Oxidation rate of aluminum in molten iron by impurity oxygen in argon is observed in order to take information on evolving nonmetallic inclusion as well as nozzle blocking of continuous casting apparatus. The aluminum is oxidized by argon containing oxygen above 10^-14 Pa in oxygen partial pressure.
Rate determining step of the oxidation in the case of no convection is diffusion process in an oxide layer generated at the surface of the molten iron.
In the case of specimen with convection, the step is chemical reaction process. The rate is expressed as a second order reaction for aluminum content. Apparent activation energy of the reaction is -1224 kJ/mol. It is discussed that the apparent activation energy corresponds to enthalpy change of the oxidation reaction.

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鉄と鋼 Vol.81(1995), No.10

Separation of Non-metallic Inclusions from Molten Metal Using Traveling Magnetic Field

鉄と鋼 Vol.81(1995), No.12

Fundamental Study on Effect of Stirring on Oxidation Rate of Molten Steel in Tundish

鉄と鋼 Vol.81(1995), No.12

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A Quantitative Description of Void Distributions in Blast Furnace Raceway

Kentaro NOZAWA, Tsunao KAMIJO, Masekata SHIMIZU

pp. 882-887

抄録

A void distribution in a blast furnace raceway significantly affects the results of numerical simulations for the raceway combustion zone. Despite its importance, technical difficulty in measuring this physical property had left a quantitative description out of reach.
In the present paper, the direct measurement of raceway void distributions was attained in a three-dimensional cold model with the aid of laser sensors. Measured void fractions clarified the typical distribution pattern in a raceway, showing the inlet region with relatively high and constant void fractions(the gas core region) from the tuyere tip to the middle part of the raceway, followed by the linear decrease of voidage toward the raceway boundary. The extent of the gas core region was used to achieve the non-dimensional representaion for the axial void distribution, and was successfully estimated by the newly established correlation between a gas core length(D_M), a tuyere diameter(D_T) and a raceway factor (R_f), expressed by D_M/D_T=0.0963R_f^0.546.

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Combustion Behavior of Pulverized Coal in Tuyere Zone of Blast Furnace and Influence of Injection Lance Arrangement on Combustibility

鉄と鋼 Vol.80(1994), No.4

Reduction Behavior of Iron Ore Fines and Circulation Characteristics of Finesin in Prereduction Fluidized Bed

鉄と鋼 Vol.79(1993), No.12

Development of "In-situ" Observation System for Oxide Films Formed during Thermal Oxidation Using Raman Spectroscopy

鉄と鋼 Vol.81(1995), No.6

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Interfacial Tensions between Mutual Interfaces of Liquid Iron, SiO₂-Al₂O₃-MnO-MnS Slags and MnS Based Sulfide

Haiping SUN, Reisuke ITO, Kunihiko NAKASHIMA, Katsumi MORI

pp. 888-893

抄録

Interfacial tensions between liquid MnO-SiO₂-Al₂O₃(sat)slag/liquid iron of varying sulfur content, MnS based sulfide/liquid iron, and MnO-SiO₂-Al₂O₃(sat) slag/MnS based sulfide were studied at 1550°C using Sessile Drop Method. The interfacial tensions, σ, between liquid MnO-SiO₂-Al₂O₃ slag/liquid iron were found to be 0.164 to 1.10 N/m, depending on sulfur and oxygen contents in liquid iron and they were expressed by the following equation as a function of sulfur and oxygen activities :
1.07-σ = 0.235 ln(1+10a_s+120a_s)
Precipitation of MnS based sulfide under the condition of adding more than 20mass% MnS to the slag was observed to occur at the slag-metal interface. The interfacial tensions between MnS based sulfide/liquid iron as well as MnO -SiO₂-Al₂O₃(sat) slag/MnS based sulfide were found to be 0.114 and 0.077 N/m, respectively.

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Oxidation of Aluminum in Molten Iron by Impurity Oxygen in Argon

鉄と鋼 Vol.81(1995), No.9

Inclusion Rating by Statistics of Extreme for Electron Beam Remelted Super Clean Bearing Steel and Its Application to Fatigue Strength Prediction

鉄と鋼 Vol.81(1995), No.10

Separation of Non-metallic Inclusions from Molten Metal Using Traveling Magnetic Field

鉄と鋼 Vol.81(1995), No.12

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Improvement of Transverse Corner Cracks in Continuously Cast Hypoperitectic Slabs

Hiroyuki YASUNAKA, Kiminori NAKAYAMA, Kiyoshi EBINA, Tadashi SAITO, Masayasu KIMURA, Hiromu MATUDA

pp. 894-899

抄録

Solidification proceeds inhomogeneously in hypoperitictic steels (medium carbon steels) with carbon contents in the range of 0.08 to 0.16%. Therefore, longitudinal and transverse cracks easily occur on the slabs in molds. Soft cooling in mold, improvement of the mold powder and decrease of the amount of secondary cooling water have been carried out to prevent these surface cracks.
In the slabs cast at Kakogawa Work's No.3 CCM, transverse corner cracks have been found on the slabs with increase in casting velocity. The cracks occur along deep oscillation marks. Mold powder component and segregation of Mn and P are detected in the vicinity of the cracks. This suggests that these cracks are generated in mold. The mechanism of crack formation is considered from analysis of the relation between transverse corner crack frequency and casting conditions. Based on the analysis, the transverse corner cracks are successfully prevented by such means as supression of the meniscus level fluctuation of molten steel, increase of the mold powder consumption and optimization of the taper on narrow face of mold.

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Effects of Strengthening Mechanisms on Fatigue Properties in Hot-Rolled Sheet Steels with Ferrite Matrix

鉄と鋼 Vol.82(1996), No.9

Asymmetry and Oscillation of the Fluid Flow Pattern in a Continuous Casting Mould: a Water Model Study

ISIJ International Vol.37(1997), No.7

Secondary Cooling Pattern for the Prevention of Surface Cracks of Continuous Casting Slab

鉄と鋼 Vol.62(1976), No.12

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Effect of Applied Stress on Flatness of Cold Rolled Austenitic Stainless Steels during Low Temperature Annealing

Haruo AOYAMA

pp. 900-905

抄録

In some cases, cold rolled austenitic stainless steels are heat-treated at a low temperature to improve the threshold value of spring and the fatigue life. Also, the flatness of stainless steel strips is improved by tensile loading given during such low temperature annealing. In order to find suitable condition for better flatness, the relationship between the strain and the stress evolved during low temperature annealing for 1 hour is investigated by heat-treating cold rolled stainless steels. The following conclusions are obtained; (1) The strain increases linearly with tensile stress up to 600N/mm². and the slope to stress is as small as the reciprocal of Young's modulus. (2) A tensile stress near 200N/mm², which is far below the yield strength, is required to improve the flatness of the strips, because of the small slope to stress. (3) The mechanism of micro deformation at low temperatures is considered to relate with stress relaxation, because most of plastic strain is evolved during heating to the annealing temperature.

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Room Temperature-Coloration of Stainless Steel by Alternating Potential Pulse Method

Kazuo SAKURAI, Kotaro OGURA

pp. 906-911

抄録

A film exhibiting interference colors is formed on stainless steel when immersed in a hot solution containing chromic and sulfuric acids, and the applied process is known as the "INCO" method. In this method, the driving force of the coloring reaction is mainly caused by the thermal energy, and the reaction should be performed at elevated temperature (about 80°C). The reproducibility of colors obtained is very poor since it is very difficult to terminate the coloring reaction immediately, to maintain high temperature, and to treat such aggressive solution. Therefore, the coloration of stainless steel is expected to take place at room temperature. In the present study, the coloring reaction was carried out in a chromic and sulfuric acid solution by applying alternating potential pulses at room temperature, and a relatively large-sized electrolytic cell was used to aim an industrialization. The uniformity of the colored film was sensitively dependent on the distribution of current rush in the solution. The sort and brightness of the colors thus produced stood well in comparison with those obtained by the conventional coloring at high temperature.

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Solidificatation Process of High Speed Tool Steel Type Cast Iron for Rolls

Keisaku OGI, Yukinori ONO, Hong ZHOU, Hirofumi MIYAHARA

pp. 912-917

抄録

The phase diagram and the solidification processes are investigated on a series of alloy specimens containing 5%Cr. 5%Mo, 5%W, 011%V and 1.04.4%C. δ, γ, MC and M₃C appeare as primary phases, and eutectics of γ+MC and γ+ M₃C crystallize at boundary compositions between liquidus surfaces of the constituent phases. The compositional extent of each liquidus surface is similar to those of Fe-V-C and Fe-5%Cr-V-C alloy system. M₂C and M₇C₃ crystallize as eutectic carbides because of segregation of Mo, W and Cr to residual liquid, though they don't appear in the diagram. The species and amount of carbides of this alloy system are estimated on the basis of the diagram and the analysis of redistribution of alloying elements.

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Phase Transformation and Compositional Partitioning in TRIP Steel

Toru MINOTE, Shiro TORIZUKA, Atsushi OGAWA, Masakazu NIIKURA

pp. 918-923

抄録

Transformation behavior and compositional partitioning in TRIP (Transformation induced plasticity) steel was investigated by means of microstructural observation and computer modelling. Orthoequilibrium partitioning of alloying elements of Si and Mn was attained even in short intercritical annealing time. A model based on transformation mechanism controlled by C diffusion well described the volume fractional change of ferrite and pearlite during the cooling to austempering temperature. Slower cooling rate significantly increased C concentration to around 0.5% in untransformed γ and caused pearlite transformation. Bainite volume fraction obtained by austempering increased with austempering temperature. Analysis by computer modelling revealed that transformation kinetics above 350°C followed the model based on diffusion mechanism, while it agreed better with the model based on shear mechanism below 350°C.

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Stacking Faults of γ″ Phase Precipitated in a Ni-15Cr-8Fe-6Nb Alloy

Kiyoshi KUSABIRAKI, Shuuichi IKEUCHI

pp. 924-929

抄録

The stacking faults of a metastable γ″ phase precipitated in a nickel-base superalloy, a modified NCF 3 type alloy (X-750M), were investigated by transmission electron microscopy and X-ray diffraction method. The γ″ precipitates are circular shaped plates at the early stage of aging and they become elliptic or irregular shaped plates at the latter stage of aging up to 1033K. Contrast which suggests the existence of stacking faults on {112}_γ″ planes can be seen in many of large γ″ precipitates extracted from the specimens aged at 1033K. It is clear that the values of γ″/γ lattice mismatch increase with increasing the aging time from the measurement of lattice constants of the γ and the γ″ phase. The formation of stacking faults on {112}_γ″ in the large γ″ precipitates is due to the movement of an a/6 [111] partial dislocation introduced by γ″/γ coherency strain. Since a part of stacking sequence has a similar crystal structure to that of a stable δ phase precipitates in γ phase, the formation of stacking faults in the γ″ precipitates is considered to be favorable for the stabilization of them.

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Fatigue Crack Propagation in Beta Ti-15Mo-5Zr-3Al Alloy

Keiro TOKAJI, Jian-Chun BIAN, Hirohisa SHIOTA

pp. 930-935

抄録

Fatigue crack propagation (FCP) in beta Ti-15Mo-5Zr-3Al alloy has been studied in laboratory air for five different microstructures which were solution-treated at 700°C, 735°C, 765°C, 850°C, and 1000°C followed by aged at 500°C. With one exception, microstructure was found to have very little or no influence on FCP behaviour. The one exception was the microstructure having the largest beta grain size whose FCP resistance was higher than that of the other microstructures due to higher crack closure levels. The effect of stress ratio on FCP could not be realized only in terms of crack closure mechanism, because static fracture mechanisms operated in FCP behaviour depending on the magnitude of the maximum stress intensity factor. Furthermore, the FCP resistance of all the microstructures was considerably lower than that of alpha-beta Ti-6Al-4V alloy, which was primarily attributed to lower crack closure levels of the present alloy.

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Effects of Microstructure, Simulated Body and Living Body Environments on Fracture Characteristics of Implant Material Ti-5Al-2.5Fe

Mitstto NIINOMI, Toshiro KOBAYASHI, Osamu TORIYAMA, Noriaki KAWAKAMI, Yoshihito ISHIDA

pp. 936-941

抄録

Mechanical properties, fracture toughness and fatigue strength of implant material Ti-5Al-2.5Fe were investigated related to the microstructure. Effect of the simulated body environment on the fatigue strength and effect of the living rabbit body environment on mechanical properties and fracture toughness in Ti-5Al-2.5Fe were then investigated. The data of Ti-5Al-2.5Fe were compared with those of Ti-6Al-4V ELI and SUS316L.
The equiaxed α structure which is formed by solution treatment at a temperature under β transus followed by air cooling and aging gives the best balance of mechanical properties in Ti-5Al-2.5Fe. Ti-5Al-2.5Fe exhibits much greater rotating bending fatigue strength compared with SUS316L and equivalent rotating bending fatigue strength to that of Ti-6Al-4V ELI in the both air and simulated body environments. Fatigue strength of Ti-5Al-2.5Fe in the simulated body environment is degraded by lowering oxygen content because the formability of oxide on the specimen surface is considered to be lowered comparing with in air. The mechanical properties of Ti-5Al-2.5Fe is not changed in the living rabbit body environment. The hard surface corrosion layer is, however, formed on the surface of SUS316L in the living rabbit body environment.

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Effect of Nitrogen Distribution on Pitting Corrosion Resistance in High Power LASER Welded Duplex Stainless Steels

鉄と鋼 Vol.83(1997), No.9

Wear Characteristics of Surface Oxidation Treated New Biomedical β-type Titanium Alloy in Simulated Body Environment

鉄と鋼 Vol.88(2002), No.9

Microbiologically Influenced Corrosion of SUS304L and SUS316L Welds Caused by Aerobic and Anaerobic Bacteria in Groundwater (I)

鉄と鋼 Vol.88(2002), No.10

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21 Nov. (Last 30 Days)

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鉄と鋼 Vol. 81 (1995), No. 9

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. 9

Revision of the Standard Method (JIS G 1253) for Spark Discharge Atomic Emission Spectromety of Iron and Steel

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Oxidation of Aluminum in Molten Iron by Impurity Oxygen in Argon

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A Quantitative Description of Void Distributions in Blast Furnace Raceway

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Interfacial Tensions between Mutual Interfaces of Liquid Iron, SiO2-Al2O3-MnO-MnS Slags and MnS Based Sulfide

SNSによる共有

Improvement of Transverse Corner Cracks in Continuously Cast Hypoperitectic Slabs

SNSによる共有

Effect of Applied Stress on Flatness of Cold Rolled Austenitic Stainless Steels during Low Temperature Annealing

SNSによる共有

Room Temperature-Coloration of Stainless Steel by Alternating Potential Pulse Method

SNSによる共有

Solidificatation Process of High Speed Tool Steel Type Cast Iron for Rolls

SNSによる共有

Phase Transformation and Compositional Partitioning in TRIP Steel

SNSによる共有

Stacking Faults of γ″ Phase Precipitated in a Ni-15Cr-8Fe-6Nb Alloy

SNSによる共有

Fatigue Crack Propagation in Beta Ti-15Mo-5Zr-3Al Alloy

SNSによる共有

Effects of Microstructure, Simulated Body and Living Body Environments on Fracture Characteristics of Implant Material Ti-5Al-2.5Fe

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

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

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Interfacial Tensions between Mutual Interfaces of Liquid Iron, SiO₂-Al₂O₃-MnO-MnS Slags and MnS Based Sulfide

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

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