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鉄と鋼
Vol. 93 (2007), No. 6

鉄と鋼 Vol. 93 (2007), No. 6

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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. 93 (2007), No. 6

42% Ni合金の高温酸化に及ぼす添加元素の影響

井上正, 小林聡雄, 山内克久, 細谷佳弘

pp. 409-415

DOI:

10.2355/tetsutohagane.93.409

抄録

The effects of alloying elements on the high temperature oxidation of laboratory melted 42% Ni iron-based alloy were investigated. A mechanism controlling the high temperature oxidation of 42% Ni alloy has been also discussed.
In the temperature range between 1000°C and 1200°C, scale, intraglanular oxidation layer and intergranular oxidation layer progressed. Addition of Cr was effective on reducing the oxide layers while addition of C and Mn didn't reduce the oxide layers markedly.
It was suggested by energy dispersive X-ray spectroscopy that oxidation layers were formed mainly by the selective-oxidation of Fe in 42% Ni alloy. The mechanism of reducing the oxide layers of 42% Ni alloy by the addition of Cr was thought to be attributed to the formation of Cr-oxide and Ni-oxide in which diffusion coefficients of metallic ion are very low value.
Marker test also revealed that the scale forming was controlled by the outer diffusion of metallic ion through the scale.

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42% Ni合金の高温酸化に及ぼす添加元素の影響

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Ris

R₂O-CaO-SiO₂ (R=Li, Na, K) スラグの熱伝導度とその推算

小澤純仁, 遠藤理恵, 須佐匡裕

pp. 416-423

DOI:

10.2355/tetsutohagane.93.416

抄録

Thermal conductivities of Li₂O-CaO-SiO₂, K₂O-CaO-SiO₂ and 37CaO-63SiO₂ slags have been determined using the non-stationary hot wire method over a wide temperature range between room temperature and 1823K to propose a prediction equation for thermal conductivities of R₂O-CaO-SiO₂ slag melts, where R represents Li, Na and K. The temperature coefficients of thermal conductivities for all the samples were negative in the liquid state. The thermal conductivities of slags having the same SiO₂ concentration, i.e., the same NBO/T (number of non-briging oxygens per tetrahedrally coordinated atom), decreased by replacement of CaO with R₂O but took almost the same value at their liquidus temperatures (T_L), irrespective of the (%R₂O)/(%CaO) ratio. Furthermore, plotting the thermal conductivities against T/T_L (temperature normalised by T_L) shows that the thermal conductivities for the melts are not dependent upon the (%R₂O)/(%CaO) ratio within experimental scatter as long as the SiO₂ concentration is kept constant. On the basis of this finding, an empirical prediction equation has been proposed for thermal conductivities of R₂O-CaO-SiO₂ melts.

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R₂O-CaO-SiO₂ (R=Li, Na, K) スラグの熱伝導度とその推算

Bibtex

Ris

Ar-Cl₂-O₂雰囲気におけるPbO-PbCl₂の塩化および蒸発挙動

松浦宏行, 月橋文孝

pp. 424-433

DOI:

10.2355/tetsutohagane.93.424

抄録

It is quite important to know the reactivity and behavior of Pb contained in steelmaking dust, or bottom ash and fly ash generated from municipal solid waste incineration process with chlorine. In the present study, chlorination and evaporation kinetics of PbO-PbCl₂ melt have been investigated in Ar-Cl₂-O₂ atmosphere from 1023 to 1123K. The weight of PbO specimen increased first and then decreased in Ar-Cl₂-O₂ stream during experiments, which phenomena mean that produced PbCl₂ by PbO chlorination formed liquid oxychloride phase of PbO-PbCl₂ system and then PbCl₂ evaporated. Increase of partial pressure of chlorine increased the initial chlorination rate, however no effect on the latter evaporation rate was observed. Decrease of maximal weight gain of specimen and the slight increase of evaporation rate were observed with increasing partial pressure of oxygen. Apparent activation energies of chlorination and evaporation of PbO-PbCl₂ melt in the steady state were 35 kJ/mol and 156 kJ/mol, respectively. Evaporation rate of PbO-PbCl₂ was also investigated at 1073K in Ar-O₂ atmosphere, however the change of evaporation rate with changing partial pressure of oxygen was within experimental error. Measured evaporation rate strongly depended on the composition of melt. Composition dependency of evaporation rate estimated from the activity of PbCl₂ for the PbO-PbCl₂ system generally represented the same trend, however the measured evaporation rate was larger than estimated one in the whole composition range. This result indicates that the formation of oxychloride melt affects the evaporation rate. Chlorination mechanisms and removal efficiency of Pb by chlorination have been discussed based on the present results.

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Ar-Cl₂-O₂雰囲気におけるPbO-PbCl₂の塩化および蒸発挙動

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静磁場と交流電流の印加制御による錫-鉛合金の結晶配向

臼井学, 岩井一彦, 浅井滋生

pp. 434-437

DOI:

10.2355/tetsutohagane.93.434

抄録

In this study, a new process for a crystal alignment of an alloy during solidification has been proposed in which the imposing periods of a static magnetic field and an alternating current are controlled. In the initial stage of the solidification both the magnetic and electric fields are imposed on the alloy to break dendrites into pieces and to spread them to the whole area of the sample. In the next stage, only the static magnetic field was applied for the sample. The function of the static magnetic field in this stage is not only the rotation of the crystals to magnetically stable direction but also the suppression of the disturbance such as liquid motion. The principle of this process was experimentally confirmed by using a Sn-10mass%Pb alloy. In the X-ray diffraction pattern of the sample solidified without the static magnetic field, the first and second highest peaks were (101)-plane and (200)-plane. That is, the crystal direction is random. On the other hand, only the peaks corresponding to a,b-plane were observed in the sample solidified under the imposition of the controlled electromagnetic field. Therefore, this process is useful for the crystal alignment of alloy.

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窒素-アルゴン混合ガスを用いたOkamoto-cavityマイクロ波誘導プラズマの分光特性

鉄と鋼 Vol.93(2007), No.2

実機鍛造プレスによる超微細粒組織厚鋼板の試作

鉄と鋼 Vol.93(2007), No.11

機械構造用鋼の軽圧下‐粗大粒発生挙動におよぼすC量およびCr，Mo添加の影響

鉄と鋼 Vol.98(2012), No.9

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静磁場と交流電流の印加制御による錫-鉛合金の結晶配向

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不活性原料介在のコークス収縮挙動および亀裂生成に及ぼす影響

深田喜代志, 山本哲也, 下山泉, 庵屋敷孝思, 藤本英和, 角広行

pp. 438-444

DOI:

10.2355/tetsutohagane.93.438

抄録

Inert materials such as coke breeze have a great influence on the contractile and fissure formation behavior of the coke cake as well as coke quality. Firstly, the contraction coefficient and Young's modulus of semi-cokes, which were produced with the different blending conditions of inert materials, inert brand, grain size and blending ratio, were measured. And then coke shrinkage and fissure formation in coke oven were evaluated by the carbonization test and a mathematical simulation model.
Due to the inert materials, micro cracks are generated inside the coke and contraction coefficient and Young's modulus decrease. Inert type, grain size and blending ratio affect the contraction coefficient curve and shrinkage ratio declines with the increase of the difference between coal and inert contraction coefficient, grain size and addition ratio. The existence of inert material also has an important effect on the coke cake structure. Clearance enlarges with the increase of inert size to around 0.30-0.50 mm, but further size increase gives negative effect to clearance. It is considered that the decrease in macro fissure becomes smaller than the increase in micro crack with the rise of inert size.

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Effect of Inert Size on Coke Strength

鉄と鋼 Vol.92(2006), No.12

Coking Pressure and Coke Shrinkage in Coke Oven

鉄と鋼 Vol.85(1999), No.4

Effect of Coking Conditions on Rankin Coefficient of Coke Cake

鉄と鋼 Vol.90(2004), No.9

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不活性原料介在のコークス収縮挙動および亀裂生成に及ぼす影響

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レーザー加熱を用いた鉄の局所表面アルミニウム粉末被覆

鈴木徹也, 田家真紀子, 森田友晴, 林照剛, 村上浩二, 友田陽, 前川克廣

pp. 445-450

DOI:

10.2355/tetsutohagane.93.445

抄録

A local surface coating using Al and Ti powders on Fe substrate is successfully performed by a laser heating method. A high hardness and high oxidation resistance can be achieved by this method. The thickness of aluminum rich layer can be controlled by the amount of the Al and Ti powder mixture paste. Concentration of aluminum at the coating layer increases with increasing laser scanning speed. Pre-heating at 573K for 10.8 ks improves the uniformity of the coating.

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レーザー加熱を用いた鉄の局所表面アルミニウム粉末被覆

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自動車用熱延高張力鋼板の機械的性質に及ぼすNbおよびVの影響

金堂大介, 国重和俊, 上路林太郎, 橋本俊一

pp. 451-458

DOI:

10.2355/tetsutohagane.93.451

抄録

Nb-bearing and V-bearing steels have been well known as typical high-strength low-alloy (HSLA) steels. However, little comparison has been made so far between the formability of Nb-bearing steels and that of V-bearing steels for automotive use. The hot direct rolling (HDR) process has been noticed because it is a very energy saving process. This paper aims to clarify the differences between the formability of Nb-bearing hot-rolled steel sheets and that of V-bearing hot-rolled steel sheets produced by both HDR process and cold charge rolling (CCR) process. A low temperature (450°C) simulated coiling characterized by good formability of steels was applied in a laboratory to 0.025% Nb (25 Nb), 0.049% Nb (50 Nb) and 0.078% V (80 V) steels with the ultimate tensile strengths (TS) ranging from 490 to 590 MPa. Hole expansion test was carried out in addition to the tensile test because stretch flangeability is very important for automobile structural uses. As a result, TS-flangeability balance of Nb-bearing steels was found to be superior to that of V-bearing steel. This is because their microstructures were distinctly different: Nb-bearing steels had a ferrite+bainite microstructure and V-bearing steel had a ferrite+fine pearlite microstructure. For the linearly precipitated carbides, V-bearing steel had a low TS-flangeability balance. It was concluded that Nb-bearing steels is strengthened by ferrite grain refining and bainite transformation hardening rather than precipitation hardening, which is the main strengthening mechanism for V-bearing steels. Change from CCR to HDR increased the strengths of all the steels studied, resulting in nearly the same TS-elongation and TS-uniform elongation balances, but the TS-flangeability balance was still maintained through this change.

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自動車用熱延高張力鋼板の機械的性質に及ぼすNbおよびVの影響

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極低炭素マルテンサイト鋼における降伏挙動と転位組織の変化

中島孝一, 藤村佳幸, 松林弘泰, 土山聡宏, 高木節雄

pp. 459-465

DOI:

10.2355/tetsutohagane.93.459

抄録

As-quenched martensitic steels exhibit a unique yielding behavior characterized by very low elastic limit. This phenomenon deeply relates to the behavior of mobile dislocations which have been introduced by martensitic transformation. In order to clarify the effect of mobile dislocations on the yielding behavior of martensitic steels, tensile testing, measurement of dislocation density by X-ray diffractometry and TEM observation were carried out in an ultralow carbon martensite (Fe-18% Ni alloy). And then the effect of dislocation strengthening on the yield stress was also discussed in terms of Bailey-Hirsch relationship. Elastic limit and 0.2% proof stress are very low in the as-quenched martensite, however slight pre-straining to the martensite has caused a marked increase in the both properties despite of a significant decrease in dislocation density. It is also confirmed that slight pre-straining to the martensite causes a clear microstructural change from randomly distributed dislocations to cellar tangled dislocations. These results suggest that mobile dislocations in martensite can easily disappear through the dislocation reaction and remained dislocations form cellar tangled structure in the early stage of tensile deformation. The Bailey-Hirsch plot for 0.2% proof stress indicated that the data of pre-strained martensite are just on the line extended from the data of cold-worked ferritic iron, while that of as-quenched martensite is obviously lower than the value expected from the Bailey-Hirsch relationship. This means that mobile dislocations in martensite do not contribute to dislocation strengthening but only make the yield stress lower through the generation of plastic strain.

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冷間加工した鉄の転位強化に関する理論的検討

鉄と鋼 Vol.104(2018), No.2

冷間加工した鉄の降伏応力に及ぼす結晶粒径の影響

鉄と鋼 Vol.104(2018), No.5

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極低炭素マルテンサイト鋼における降伏挙動と転位組織の変化

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2.25Cr-1Mo鋼の応力急変試験によるクリープ変形挙動の評価

早川弘之, 寺田大将, 吉田冬樹, 中島英治, 金谷章宏, 中島聡

pp. 466-471

DOI:

10.2355/tetsutohagane.93.466

抄録

To characterize the creep deformation mechanism of 2.25Cr-1Mo Steel, stress change tests were conducted during creep tests. In this study it was confirmed that the dislocation behavior during the creep tests were in viscous manner, because no instantaneous plastic strain was observed at stress increments and transient backward creep behavior was observed after stress reduction same as Modified 9Cr-1Mo Steel. Mo-bilities of dislocation were evaluated by observed backward creep behavior after stress reductions. Internal stresses were evaluated by the changes of creep strain rate in stress increments. These values were almost stable during creep deformation. Mobile dislocation densities were evaluated with the estimated mobilities of dislocation and the changes of creep strain rate in stress increments. Variation of evaluated mobile dislocation densities with creep strain showed the same tendency as variation of creep strain rate. Therefore mobile dislocation density is the dominant factor that influences the creep strain rate in creep deformation of this steel. The difference of estimated mobility of dislocation between 2.25Cr-1Mo Steel and Modified 9Cr-1Mo Steel was considered to be caused by the different amount of solute Mo between these steels.

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2.25Cr-1Mo鋼の応力急変試験によるクリープ変形挙動の評価

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オイル層を有する水浴の過渡状態における旋回液体噴流の発生領域予測

井口大亮, 大参達也, 井口学

pp. 472-474

DOI:

10.2355/tetsutohagane.93.472

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オイル層を有する水浴の過渡状態における旋回液体噴流の発生領域予測

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

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ISIJ International 早期公開

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鉄と鋼 Vol. 93 (2007), No. 6

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. 93 (2007), No. 6

42% Ni合金の高温酸化に及ぼす添加元素の影響

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R2O-CaO-SiO2 (R=Li, Na, K) スラグの熱伝導度とその推算

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Ar-Cl2-O2雰囲気におけるPbO-PbCl2の塩化および蒸発挙動

SNSによる共有

静磁場と交流電流の印加制御による錫-鉛合金の結晶配向

SNSによる共有

不活性原料介在のコークス収縮挙動および亀裂生成に及ぼす影響

SNSによる共有

レーザー加熱を用いた鉄の局所表面アルミニウム粉末被覆

SNSによる共有

自動車用熱延高張力鋼板の機械的性質に及ぼすNbおよびVの影響

SNSによる共有

極低炭素マルテンサイト鋼における降伏挙動と転位組織の変化

SNSによる共有

2.25Cr-1Mo鋼の応力急変試験によるクリープ変形挙動の評価

SNSによる共有

オイル層を有する水浴の過渡状態における旋回液体噴流の発生領域予測

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

R₂O-CaO-SiO₂ (R=Li, Na, K) スラグの熱伝導度とその推算

Ar-Cl₂-O₂雰囲気におけるPbO-PbCl₂の塩化および蒸発挙動

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