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鉄と鋼
Vol. 108 (2022), No. 2

鉄と鋼 Vol. 108 (2022), No. 2

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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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Vol. 110 (2024)
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キーワードランキング

21 Dec. (Last 30 Days)

鉄と鋼 Vol. 108 (2022), No. 2

Erratum: Spinodal Decomposition in Plastically Deformed Fe-Cr-Co Magnet Alloy [Tetsu-to-Hagané Vol.107 (2021), No.2, pp.147-153]

pp. 67-67

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温度および摩擦制御によるNi基超合金(Alloy720Li)の熱間均一圧縮試験

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Improvement of Carbothermic Reduction of Copper Smelting Slag and Valuable Constituents Recovery

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論文タイトル

Bibtex

Ris

温度および摩擦制御によるNi基超合金(Alloy720Li)の熱間均一圧縮試験

堀越理子, 柳田明, 柳本潤

pp. 107-119

DOI:

10.2355/tetsutohagane.TETSU-2021-079

抄録

Isothermal compression tests at 1000°C and 0.1 s^–1 strain rate, in which mica or glass sheets were used as a lubricant, were conducted. Isothermal condition was achieved by placing high-heat-resistant (HHR) alloys between a workpiece and ceramic tools in the induction-heating configuration to prevent heat from escaping to the ceramic tools. To perform high compression tests, it was necessary to increase the diameter of the HHR alloy, for which a new single-turn coil was designed using FEM calculation coupled with deformation-temperature electromagnetic fields. In order to obtain the correct flow stress, inverse analysis was conducted using the FEM calculation, in which temperature and strain rate fluctuations were compensated. However, the compensation was insufficient when the distribution of temperature and strain rate was large. The use of glass sheets as a lubricant considerably reduced friction and uniform deformation was achieved. Thus, flow stress obtained using the inverse analysis became extremely reliable. The flow stress of mica obtained using inverse analysis with a constant friction coefficient was different from that of glass. Introducing new friction model that the friction coefficient changed from 0.02 to 0.3, the flow stress of mica was consistent with that of glass. Therefore, the flow stress obtained using the inverse analysis for the new configuration proposed in this study proved to be reliable.

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Bibtex

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アルカリジンケート浴からのZn-Ni合金電析挙動に及ぼす浴温の影響

裵聖和, 大上悟, 谷ノ内勇樹, 孫仁俊, 中野博昭

pp. 120-130

DOI:

10.2355/tetsutohagane.TETSU-2021-092

抄録

Zn–Ni alloys were electrodeposited on a Cu electrode at 10–5000 A·m⁻² and 5 × 10⁴ C·m⁻² in an unagitated zincate solution at 293, 313, and 333 K. The effect of solution temperature on the electrodeposition behavior of Zn–Ni alloys from alkaline zincate solutions was investigated. The transition current density at which the deposition behavior shifted from a normal to anomalous codeposition was almost similar at 293 and 313 K but increased at 333 K. The transition current density increased at 333 K due to the enhanced hydrogen evolution and Ni deposition. The current efficiency for alloy deposition increased with solution temperature in both normal (10–50 A·m⁻²) and anomalous (500 A·m⁻²) codepositions region. In a normal codeposition region, Ni deposition and hydrogen evolution mainly occurred, and the current efficiency increased with solution temperature due to a larger promotion effect of increase in solution temperature on the Ni deposition. In an anomalous codeposition region at 500 A·m⁻², Zn deposition and hydrogen evolution mainly occurred, and Zn seems to proceed under a mixed rate-determining process of the charge transfer and diffusion of Zn ions. The current efficiency increased with solution temperature since the diffusion of Zn ions was accelerated. The Ni content in the deposited films increased with solution temperature at all the current densities, since Ni deposition was more accelerated than Zn deposition with increasing solution temperature in the region where the charge transfer process was rate-limiting. The γ phase of the deposited films increased with increasing solution temperature.

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アルカリジンケート浴からのZn-Ni合金電析挙動に及ぼす浴温の影響

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δフェライトを有する12Cr-5.4W鋼のクリープ破断強度に及ぼす冷間圧延の影響

佐藤雄大, 榊原洋平, 野村恭兵

pp. 131-140

DOI:

10.2355/tetsutohagane.TETSU-2021-061

抄録

This study examined cold rolling (20%) effects on the creep rupture strength of 12Cr-5.4W ferritic steel with martensite and δ-ferrite at 700 °C. Creep rupture strength of the as-received steel was equal to or greater than that of Gr.92 steel under 100-50 MPa, but cold rolling decreased the creep rupture strength by as much as 10%. Microstructure observations of crept steels revealed coarsening of the Laves phase by cold rolling in δ-ferrite but not in martensite. This finding suggests that the Laves phase coarsening in δ-ferrite is related to short-circuit diffusion because fine sub-grain structures were observed inside δ-ferrite grains in the cold-rolled steel after creep. Also, the martensite lath structure in the cold-rolled steel recovered quickly. Collectively, these cold-rolling-related phenomena of microstructural degradations are inferred as factors decreasing the creep rupture strength. In the as-received steel, some creep voids were observed in martensite: most were observed adjacent to coarse vanadium nitrides. By contrast, creep voids in the cold-rolled steel were most numerous near the martensite – δ-ferrite interface. It was suggested that nucleation of creep voids near the interface in the cold-rolled steel was attributed to mechanisms such as the Laves phase size and distribution at the interface and stress concentration effects of dislocations that were piled up toward the interface.

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δフェライトを有する12Cr-5.4W鋼のクリープ破断強度に及ぼす冷間圧延の影響

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フェライト組織鋼の靭性に及ぼすCの存在状態と固溶Nの影響

吉村信幸, 潮田浩作, 白幡浩幸, 星野学, 重里元一, 田中將己

pp. 141-155

DOI:

10.2355/tetsutohagane.TETSU-2021-076

抄録

To develop microstructure control concepts for ensuring the toughness of high-strength steel plates, basic research was conducted using ferrite single-phase steels with different amounts of C, and the effects of the states of C were investigated along with those of solute N. In this study, Fe-0.017C (mass%) alloy, wherein the state of C was changed to a solid solution, intragranular cementite, and intergranular cementite, were used for microstructural observation, Charpy testing, and fracture surface investigation. The results reveal that the toughness of the intragranular cementite steel was the best, followed by that of solute C steel and intergranular cementite steel. In intergranular cementite steel with significantly inferior toughness, the coarse intergranular cementite leads to dislocation pile-up, initial crack formation, and macroscopic brittle fracture. The brittle fracture of intragranular cementite steel was caused by the deformation twins. It is thought that the fine intragranular cementite only had a minor effect on the crack initiation and dislocation mobility. Twin was also confirmed at the initiation point of brittle fracture in the solute C steel. Hence, it was deduced that the deterioration of toughness caused by solute C resulted from the promotion of twinning, which replaced the dislocation movements. However, the deterioration of toughness caused by solute C was smaller compared with that caused by solute N, which partly caused intergranular fracture. This is attributed to the suppression of intergranular fracture by the presence of a small amount of solute C.

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フェライト・パーライト鋼中のTiNにおけるき裂生成の観察と定量化

鉄と鋼 Vol.108(2022), No.3

焼戻しマルテンサイト鋼の水素脆化特性に及ぼすひずみ速度の影響とその律速過程

鉄と鋼 Vol.107(2021), No.11

低炭素鋼の低酸素濃度溶接金属における酸化物/母相界面のMn欠乏挙動

鉄と鋼 Vol.108(2022), No.3

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フェライト組織鋼の靭性に及ぼすCの存在状態と固溶Nの影響

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析出硬化型高Mnオーステナイト鋼の水素脆化挙動に及ぼすNi含有量および時効熱処理の影響

細田孝, 小川祐平, 髙桑脩, 本村達, 細井日向, 松永久生

pp. 156-172

DOI:

10.2355/tetsutohagane.TETSU-2021-093

抄録

The effects of Ni concentration and dispersed conditions of vanadium carbide (VC) nano-particles on the hydrogen embrittlement (HE) behavior of precipitation-hardened high-Mn austenitic steels were investigated under the presence of thermally pre-charged hydrogen. Slow strain-rate tensile tests revealed that HE susceptibility decreased with an addition of Ni. VC precipitates functioned as the trapping sites for dissolved hydrogen, though its effect on resisting the HE was trivial. Hydrogen enhanced intergranular (IG) fracture wherein its area fraction was increased with the hardening by VC as well as with the escalation of internal hydrogen concentration. The IG fracture was the primary rationale for the hydrogen-induced loss of ductility. Possible mechanisms of the IG-related HE as well as future strategy for mitigating the mechanical degradation is discussed based on the fractographic observation and post-mortem microstructural analyses.

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腐食生成物を有する鋼上でのスケーリング優先サイト

鉄と鋼 Vol.107(2021), No.10

ICP-MSによる高純度鉄中微量元素の同時定量における鉄高選択性固相抽出樹脂の応用

鉄と鋼 Vol.107(2021), No.10

Grade 91鋼の室温機械的特性に及ぼす低温焼戻しにより析出する炭化物の影響

鉄と鋼 Vol.107(2021), No.10

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析出硬化型高Mnオーステナイト鋼の水素脆化挙動に及ぼすNi含有量および時効熱処理の影響

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21 Dec. (Last 30 Days)

Wettability of CaS against molten iron at 1873 K

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鉄と鋼 Vol. 108 (2022), No. 2

キーワードランキング

hydrogen reduction of iron ore

gasification

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19al6mg

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鉄と鋼 Vol. 108 (2022), No. 2

Erratum: Spinodal Decomposition in Plastically Deformed Fe-Cr-Co Magnet Alloy [Tetsu-to-Hagané Vol.107 (2021), No.2, pp.147-153]

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温度および摩擦制御によるNi基超合金(Alloy720Li)の熱間均一圧縮試験

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アルカリジンケート浴からのZn-Ni合金電析挙動に及ぼす浴温の影響

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δフェライトを有する12Cr-5.4W鋼のクリープ破断強度に及ぼす冷間圧延の影響

SNSによる共有

フェライト組織鋼の靭性に及ぼすCの存在状態と固溶Nの影響

SNSによる共有

析出硬化型高Mnオーステナイト鋼の水素脆化挙動に及ぼすNi含有量および時効熱処理の影響

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Contents

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Cover

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Editorial Board and Copyright Page

SNSによる共有

論文アクセスランキング

Wettability of CaS against molten iron at 1873 K

凝固過程における溶鋼中からAl2O3上へのMnSの晶出挙動

Reduction and Melting Behaviors of Iron Oxide Composite with Carbon Deposited Using CO-CO2-H2 Mixed Gas

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

Perspectives on the Promising Pathways to Zero Carbon Emissions in the Steel Industry toward 2050

モデル材料を用いた凝固過程における介在物生成挙動のその場観察

Transition behavior of gas containing suspension from solid-like to liquid-like flows

A hot rolling full process rolling force prediction method based on transfer learning and Inception-LSTM neural network

Slag-steel reactions in the refining of Advanced High-Strength Steel

Chemical and Mechanical Factors on Phosphorus Dissolution Behavior from P-concentrated Slag

詳細検索

凝固過程における溶鋼中からAl₂O₃上へのMnSの晶出挙動

Reduction and Melting Behaviors of Iron Oxide Composite with Carbon Deposited Using CO-CO₂-H₂ Mixed Gas