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鉄と鋼
Vol. 107 (2021), No. 11

鉄と鋼 Vol. 107 (2021), No. 11

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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 Dec. (Last 30 Days)

鉄と鋼 Vol. 107 (2021), No. 11

データサイエンスに基づく鉄鋼プロセス設備のレベル別異常予兆検知技術

平田丈英, 松下昌史, 飯塚幸理, 鈴木宣嗣

pp. 897-905

DOI:

10.2355/tetsutohagane.TETSU-2021-031

抄録

In steel making processes, influence of an equipment fault on production operation is significant. It is strongly required to detect an equipment fault at an early stage and to prevent the damage. Therefore, fault detection technique for steel making facilities based on data science is developed as an online-monitoring system. One of main features of the developed system is hierarchical monitoring consisting of three levels such as an entire process, facilities and sensors. Another is display of heat-mapping according to the degree of anomaly for huge number of monitoring items. Some anomaly signs at the hot rolling process where the system has been developed are successfully detected.

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鉄と鋼 Vol.107(2021), No.10

A Hybrid Modeling Method Based on Expert Control and Deep Neural Network for Temperature Prediction of Molten Steel in LF

ISIJ International Vol.62(2022), No.3

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データサイエンスに基づく鉄鋼プロセス設備のレベル別異常予兆検知技術

Bibtex

Ris

MgCl₂を含むさび層を形成させたFeの大気腐食に伴う水素侵入に及ぼす大気湿度の影響

汪洋, 山西潤, 春名匠

pp. 906-914

DOI:

10.2355/tetsutohagane.TETSU-2021-081

抄録

An Fe plate, whose one side was electro-polished and the other was covered with the rust layer containing 25.7 g·m⁻² MgCl₂, was used as the specimen to investigate the effect of humidity on the hydrogen absorption of the plate during atmospheric corrosion. The specimen was subjected to an electrochemical hydrogen-absorption test during which the rusted surface was exposed to the air with controlled relative humidity (RH) and atmospheric corrosion occurred on it. When the rusted surface was subjected to dry (RH 0%)–wet (RH 27%) cycle tests for 10.8 ks each, the anodic current density corresponding to the hydrogen-absorption rate was measured on the hydrogen detection surface. The maximum current density was almost independent of the cycle during the first 10 cycles, after which it decreased with an increase in the cycle, reaching almost a steady value after about 40 cycles. After 55 cycles of the dry–wet cycle test, the specimen was subjected to an electrochemical hydrogen-absorption test to obtain the relationship between the steady-state hydrogen-absorption rate and RH. Hydrogen absorption was observed at RH over about 15%, and the absorption rate increased rapidly with an increase in RH, reached a maximum at RH of about 30%, and then decreased rapidly. When RH increased beyond 40%, the absorption rate increased again, reached a maximum value at RH of 80%, and then decreased gradually. The specimen with the rust layer containing 39.8 g·m⁻² MgCl₂ also showed two peaks in the hydrogen-absorption rate versus RH plot.

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MgCl₂を含むさび層を形成させたFeの大気腐食に伴う水素侵入に及ぼす大気湿度の影響

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異なるMgCl₂含有量のさび層を形成させたFeに湿度を制御した大気中で発生する腐食に伴う水素侵入

春名匠, 汪洋, 山西潤

pp. 915-922

DOI:

10.2355/tetsutohagane.TETSU-2021-082

抄録

Fe plates with rust layers containing various MgCl₂ amounts were prepared as specimens. Each specimen was subjected to dry−wet repeated cycle test beyond 50 cycles, and then subjected to electrochemical hydrogen absorption test under atmospheric corrosion in the air with controlled relative humidity (RH). For an MgCl₂ amount of 39.8 g·m⁻², a hydrogen absorption rate (i_H) started to increase from an RH around 15%, steeply increased with an increase in RH up to about 30%, steeply decreased up to about 35%, gradually increased up to 65% and gradually decreased up to about 92%. A decrease in MgCl₂ amount in the range between 0.514 and 39.8 g·m⁻² induced a decrease in i_H in the whole RH range. The maximum i_H at an RH around 30% increased with an increase in MgCl₂ amount in the rust layer. Besides, the RH where the maximum i_H was obtained beyond an RH of 40% increased with a decrease in MgCl₂ amount. From theoretical relationship between RH and thickness of MgCl₂ solution film on the Fe plate without rust layer, it is found that the solution film thicknesses at the RHs were about 0.18 mm, almost independent of MgCl₂ amount. In addition, thicknesses of the rust layers containing 25.7 and 39.8 g·m⁻² MgCl₂ were measured to be almost 0.18 mm each other. The trends of i_H depending on MgCl₂ amount were tried to be explained using nature of deliquescence for MgCl₂.

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異なるMgCl₂含有量のさび層を形成させたFeに湿度を制御した大気中で発生する腐食に伴う水素侵入

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鉄鋼における熱力学物性値の電子論計算とFe-Mo-B三元系理論状態図への応用

榎木勝徳, 高橋宏太, 三富崇永, 大谷博司

pp. 923-933

DOI:

10.2355/tetsutohagane.TETSU-2021-078

抄録

In this study, the ground structures of the Fe-Mo-B ternary systems were estimated by first-principles calculations based on genetic algorithm and the free energies of their structures are evaluated by electronic calculations and statistical thermodynamic techniques. In addition, the phase diagram at finite temperature was theoretically constructed using the calculated free energies and the result was compared with the experimental knowledge. The space groups and compositions of many ground structures obtained by the calculations correspond well with the experimental findings, but the agreement is not perfect. However, by including metastable structures by only a few kJ/mol than the ground state, it becomes clear that the appearance of almost all structures can be predicted based on this technique. The new calculation technique of such theoretical phase diagrams suggested in the present study is expected to open up the possibility of estimation of unknown phase diagram, reexamination of experimental phase diagrams and discovery of new phases. On the other hand, examining the calculation conditions for improving the accuracy of energy calculation, consideration of the anharmonicity of atomic vibration, magnetic entropy effect, handling of solid solution, etc. are mentioned as problems requiring further consideration.

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鉄鋼における熱力学物性値の電子論計算とFe-Mo-B三元系理論状態図への応用

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リバーパターンとテアリッジに基づく脆性破壊起点の自動探索手法の開発

滑川哲也, 星野学, 藤岡政明, 白幡浩幸

pp. 934-943

DOI:

10.2355/tetsutohagane.TETSU-2021-025

抄録

A method to automatically search brittle fracture initiation point is proposed. The method calculates flow paths from each edge of an image to opposite side along flow potential. The potential is derived from the direction of river-pattern and tear ridge. The most concentrated position of flow paths is determined as a fracture initiation point. The method achieves 99% precision and high speed analysis for low magnification images of 206 thick plate samples. Furthermore, discriminating ductile fracture by machine learning and excluding noise potential obtained from it, and considering local feature of river-pattern that spread radially near a fracture initiation point, the method precision is improved for high magnification images. Using fractal feature of brittle fracture and repeatedly applying the method, a fracture initiation point is determined within the size of a single grain level.

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リバーパターンとテアリッジに基づく脆性破壊起点の自動探索手法の開発

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焼戻しマルテンサイト鋼を用いた破壊靭性試験における水素誘起割れの機構解明に対する分子動力学計算の適用

松原和輝

pp. 944-954

DOI:

10.2355/tetsutohagane.TETSU-0201-043

抄録

It is well known that the presence of hydrogen deteriorates mechanical properties of steels, that appears as reduced fracture toughness, shorter fatigue lifetime, etc.; these phenomena are recognized as hydrogen embrittlement. The effect of hydrogen on crack initiation of fracture toughness test has been investigated using a combination of experimental and computational approaches. Tempered lath martensitic steel was subjected to fracture toughness test with monotonically rising load in air and high-pressure hydrogen gas. While crack propagated continuously within grains in air, cracking in hydrogen grew by linking isolated interface failure ahead of a main crack tip. Then, to understand the nucleation mechanism of isolated failure in the presence of hydrogen, the tensile simulations of twist grain boundaries (TGBs) rotated along <110> axis at various angles were conducted using molecular dynamics calculations. While the dislocation emission from TGB rotated 70° is dominant deformation mode in the absence of hydrogen, the rupture along TGB rotated 110° and 170° without stress relaxation due to dislocation emission is dominant deformation mode in the presence of hydrogen. As a consequence, it is indicated that the origin of hydrogen-induced isolated crack initiation in the vicinity of fatigue pre-crack is the rupture along the block boundaries within martensitic structure due to hydrogen-induced inhibition of dislocation emission from GBs.

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焼戻しマルテンサイト鋼を用いた破壊靭性試験における水素誘起割れの機構解明に対する分子動力学計算の適用

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内部・外部水素によるNi基超合金718の延性低下機構とその温度依存性

野口耕平, 小川祐平, 高桑脩, 松永久生

pp. 955-967

DOI:

10.2355/tetsutohagane.TETSU-2021-056

抄録

Toward a better understanding of the hydrogen embrittlement characteristics in nickel-based superalloy 718, tensile tests were performed under hydrogen pre-charged states (internal hydrogen) as well as in hydrogen gas environment (external hydrogen) at various temperatures ranging from −196 to 300°C. Under the internal hydrogen conditions, hydrogen-induced loss of ductility was maximized at around 25°C, while it was recovered with increasing/decreasing test temperature and almost fully mitigated particularly at −196°C. On the other hand, under the external hydrogen conditions, deleterious impact of hydrogen on the ductility monotonically increased with temperature elevation. Scanning electron microscopy (SEM) and electron backscattered diffraction (EBSD) analyses on post-mortem samples revealed that the microstructural initiation sites of hydrogen-induced micro-cracks in internal hydrogen states were annealing twin boundaries or crystallographic slip planes (i.e., {111} planes) at −40~300°C wherein the loss of ductility was substantial, albeit intergranular fracture prevailed at −196°C, accompanying minimum embrittlement effect. Meanwhile, in the case of external hydrogen states, the fracture modes were transitioned from intergranular to slip plane cracking with increasing temperature in response to the augmentation of embrittlement magnitude. The rationales of these multiple hydrogen-related failure modes and their roles on macroscale material performance are discussed on the basis of hitherto-known, unique deformation mechanisms driving the plasticity in this alloy in addition to the hydrogen diffusion rate/pathways which are strongly dependent on temperature.

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内部・外部水素によるNi基超合金718の延性低下機構とその温度依存性

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残留オーステナイト形状の異なる1 GPa級TRIP鋼の機械的特性に及ぼす変形温度の影響

土田紀之, 田中孝明, 田路勇樹

pp. 968-976

DOI:

10.2355/tetsutohagane.TETSU-2021-058

抄録

The effect of deformation temperature on the mechanical properties of 1-GPa-grade TRIP steels with different retained austenite (γ_R) morphologies was studied. The temperature dependence on the deformation-induced martensitic transformation behavior was also investigated. The uniform elongation below room temperature was relatively large in the needle-like γ_R steel, whereas the tensile strength at each temperature was almost the same as it was independent of the γ_R morphology. The better tensile strength–uniform elongation balance was obtained at 373 K for the needle-like γ_R steel and at 473 K for blocky γ_R one. The mechanical stability of γ_R was higher in the needle-like γ_R steel, according to the x-ray diffraction experiments. γ_R was mechanically stable with increasing temperature, but its volume fraction decreased at temperatures above 473 K because of the deformation-induced bainitic transformation. In this paper, the quantitative conditions of deformation-induced transformation to obtain better uniform elongation in the 1-GPa-grade TRIP steels are summarized from the viewpoints of the volume fraction of deformation-induced martensite and the transformation rate.

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残留オーステナイト形状の異なる1 GPa級TRIP鋼の機械的特性に及ぼす変形温度の影響

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第一原理計算と結晶方位解析を用いたC14 Fe₂W Laves相の劈開破壊挙動の評価

山﨑重人, 田中將己, 森川龍哉, 渡部康明, 山下満男, 和泉栄

pp. 977-985

DOI:

10.2355/tetsutohagane.TETSU-2021-069

抄録

Cleavage fracture of C14 Fe₂W Laves phase was investigated using crystal orientation measurement with scanning electron microscopy and first-principles calculations. Trace analysis of the orientations of cleavage planes reveals that cleavage fracture occurred at five types of crystal planes of (0001), {1100}, {1120}, {1101} and {1122}, among which the fracture at (0001) is the most preferable. The first-principle calculations of the surface energy for fracture, Young's modulus, and Poisson's ratio showed that the minimum fracture toughness value of 1.62 MPa·m^1/2 was obtained at (0001). The tendency that the values of calculated fracture toughness become larger with the higher indexed planes is almost the same as the frequency of the types of cleavage planes in the trace analysis. It is concluded that the fracture toughness of C14 Fe₂W Laves phase is controlled by the surface energy for fracture and Young’s modulus.

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A New Diamond Chemical Vapor Deposition Method on Steel Surface

日本エネルギー学会誌 Vol.101(2022), No.8

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第一原理計算と結晶方位解析を用いたC14 Fe₂W Laves相の劈開破壊挙動の評価

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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

崎山裕嗣, 大村朋彦, 杉田一樹, 水野正隆, 荒木秀樹, 白井泰治

pp. 986-995

DOI:

10.2355/tetsutohagane.TETSU-2021-057

抄録

The effect of strain rate on hydrogen embrittlement susceptibility of high strength tempered martensitic steel was investigated by tensile tests under cathodic hydrogen charge. Fracture elongation was decreased with a decrease in strain rate and increase in diffusible hydrogen concentration. The mechanism of hydrogen embrittlement susceptibility was investigated based on vacancy-type lattice defects formation by positron lifetime spectroscopy. The clear correlation was not comfirmed between strain rate and the parameters of average positron lifetime, dislocation density and vacancy density. These parameters decreased with a decrease in fracture elongation, it means that these parameters did not reflect hydrogen embrittlement susceptibility. On the other hand, vacancy clustering was promoted with a decrease in strain rate. Therefore, it is assumed that strain rate dependence of hydrogen embrittlement susceptibility is determined by vacancy clustering process.

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6%Ni炭素鋼の摩擦攪拌接合における攪拌部の残留オーステナイト量に及ぼす炭素量およびオーステナイト粒径の影響

鉄と鋼 Vol.108(2022), No.6

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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

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鉄と鋼 Vol. 107 (2021), No. 11

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hydrogen reduction of iron ore

gasification

characterization of coal and biomass based on kinetic parameter distributions for pyrolysis

kinetics of decarburization of liquid iron with high concentration ofcarbon

mechanisms of liquefaction and pyrolysis reaction of biomass

hydrogen reduction

steel

19al6mg

automotive wheel

deguchi

鉄と鋼 Vol. 107 (2021), No. 11

データサイエンスに基づく鉄鋼プロセス設備のレベル別異常予兆検知技術

SNSによる共有

MgCl2を含むさび層を形成させたFeの大気腐食に伴う水素侵入に及ぼす大気湿度の影響

SNSによる共有

異なるMgCl2含有量のさび層を形成させたFeに湿度を制御した大気中で発生する腐食に伴う水素侵入

SNSによる共有

鉄鋼における熱力学物性値の電子論計算とFe-Mo-B三元系理論状態図への応用

SNSによる共有

リバーパターンとテアリッジに基づく脆性破壊起点の自動探索手法の開発

SNSによる共有

焼戻しマルテンサイト鋼を用いた破壊靭性試験における水素誘起割れの機構解明に対する分子動力学計算の適用

SNSによる共有

内部・外部水素によるNi基超合金718の延性低下機構とその温度依存性

SNSによる共有

残留オーステナイト形状の異なる1 GPa級TRIP鋼の機械的特性に及ぼす変形温度の影響

SNSによる共有

第一原理計算と結晶方位解析を用いたC14 Fe2W Laves相の劈開破壊挙動の評価

SNSによる共有

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

SNSによる共有

Contents

SNSによる共有

Cover

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Editorial Board and Copyright Page

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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

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

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詳細検索

MgCl₂を含むさび層を形成させたFeの大気腐食に伴う水素侵入に及ぼす大気湿度の影響

異なるMgCl₂含有量のさび層を形成させたFeに湿度を制御した大気中で発生する腐食に伴う水素侵入

第一原理計算と結晶方位解析を用いたC14 Fe₂W Laves相の劈開破壊挙動の評価

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