Hydrogen trapping and precipitation of alloy carbides in molybdenum added steels and vanadium added steels

IF 1.6 4区材料科学 Q2 METALLURGY & METALLURGICAL ENGINEERING

Isij International Pub Date : 2024-02-29 DOI:10.2355/isijinternational.isijint-2024-031

Shunsuke Taniguchi, Miyuri Kameya, Yukiko Kobayashi, Kazuma Ito, Shingo Yamasaki

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引用次数: 0

Abstract

Martensitic steels of Fe-0.1%C-2%Mn-1.6%Mo and Fe-0.1%C-2%Mn-0.2%V alloys were subjected to tempering at 873 K to investigate the hydrogen trapping of Mo and V carbides. We analyzed the alloy carbides in detail via atomic-resolution scanning transmission electron microscopy and atom probe tomography, and evaluated hydrogen trapping energy via ab initio calculations. The hydrogen content of the Mo-added steel tempered for 1.8 ks increased from that of the quenched Mo-added steel, and the hydrogen content monotonically decreased as the tempering time increased. The hydrogen content of the V-added steels increased during tempering up to 7.2 ks and then remained almost constant. A plate-shaped B1-type Mo carbide with a chemical composition of MoC_0.50 precipitated in the Mo-added steel tempered for 3.6 ks. Needle-shaped HCP Mo₂C precipitated and the B1-type Mo carbide decreased in the Mo-added steel tempered for 14.4 ks. A plate-shaped B1-type V carbide with a chemical composition of VC_0.75 precipitated in the V-added steel tempered for 14.4 ks. We found a positive correlation between the hydrogen content and the product of the interface area and the carbon vacancy fraction of the B1-type alloy carbide. The hydrogen trapping energy of the carbon vacancy at the interface between BCC-Fe and the B1-type Mo carbide was higher than that of the interstitial sites in BCC-Fe. These results suggest that the main trapping site in the tempered Mo-added steel was the carbon vacancy at the interface of B1-type MoC_0.50, not HCP Mo₂C.

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添加钼的钢和添加钒的钢中的氢捕集和合金碳化物的析出

对 Fe-0.1%C-2%Mn-1.6%Mo 和 Fe-0.1%C-2%Mn-0.2%V 的马氏体钢进行了 873 K 回火，以研究 Mo 和 V 碳化物的氢捕获。我们通过原子分辨率扫描透射电子显微镜和原子探针断层扫描详细分析了合金碳化物，并通过 ab initio 计算评估了氢捕获能。回火 1.8 ks 的添加钼的钢材的氢含量比淬火添加钼的钢材的氢含量有所增加，并且随着回火时间的延长，氢含量单调下降。V-added 钢的氢含量在回火过程中增加到 7.2 ks，然后几乎保持不变。在回火时间为 3.6 ks 的添加 Mo 的钢中析出了化学成分为 MoC0.50 的板状 B1 型 Mo 碳化物。在添加 Mo 的钢中回火 14.4 ks，析出针状 HCP Mo2C，B1 型 Mo 碳化物减少。化学成分为 VC0.75 的板状 B1 型 V 碳化物在回火 14.4 ks 的添加 V 的钢中析出。我们发现氢含量与 B1 型合金碳化物的界面面积和碳空位率的乘积之间存在正相关。BCC-Fe 与 B1 型碳化 Mo 之间界面碳空位的氢捕获能高于 BCC-Fe 中的间隙位点。这些结果表明，回火添加 Mo 的钢中的主要捕获位点是 B1 型 MoC0.50 界面的碳空位，而不是 HCP Mo2C。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Isij International 工程技术-冶金工程

CiteScore

3.40

自引率

16.70%

发文量

268

审稿时长

2.6 months

期刊介绍： The journal provides an international medium for the publication of fundamental and technological aspects of the properties, structure, characterization and modeling, processing, fabrication, and environmental issues of iron and steel, along with related engineering materials.