Effect of Cr on the Microstructure and Strength‐Toughness of High‐Strength and Heat‐Resistant Stainless Steel

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2024-08-30 DOI:10.1002/srin.202400412

Hongxiao Chi, Liping Pian, Jinbo Gu, Yong Sun, Xuedong Pang, Zhenfei Xin, Dangshen Ma

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Abstract

The effect of Cr content on the microstructure and mechanical properties of CSS‐42L steel is investigated by X‐ray diffractometer, scanning electron microscopy, and transmission electron microscopy. The results show that increasing Cr from 8% to 13.5% significantly improves toughness and ductility while moderately decreasing the strength. The tensile strength, fracture toughness (KIC), and impact absorbing energy of 13.5% Cr steel are 1.8 GPa, 88.6 MPa√m, and 58.5 J, respectively. 13.5%Cr steel possesses larger grain size and fewer undissolved M6C carbides than 8%Cr and10%Cr steels, which is attributed to that Cr addition increases Cr content in the (Mo,Cr)6C, reducing the dissolution temperature and ability to inhibit grain growth. Cr significantly decreases the Martensite start (Ms) temperature from 263 to 53.1 °C and increases the retained austenite from 0.3 to 13.19 vol%. Cr increases the number density and diameter of nanoscale M2C, which is attributed to Cr promoting the dissolution of Mo and increasing the nucleation rate. Meanwhile, the higher Cr content also increases the growth rate of the carbides along the diameter direction. Cr addition reduces the contribution from coherency strengthening caused by decreased lattice misfit and increased the contribution of Orowan dislocation looping resulted from higher volume fraction and size of M2C.

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铬对高强度耐热不锈钢微观结构和强度-韧性的影响

通过 X 射线衍射仪、扫描电子显微镜和透射电子显微镜研究了铬含量对 CSS-42L 钢微观结构和机械性能的影响。结果表明，将铬含量从 8%提高到 13.5%，可显著提高韧性和延展性，同时适度降低强度。13.5%Cr 钢的抗拉强度、断裂韧性（KIC）和冲击吸收能分别为 1.8 GPa、88.6 MPa√m 和 58.5 J。与 8%Cr 和 10%Cr 钢相比，13.5%Cr 钢具有更大的晶粒尺寸和更少的未溶解 M6C 碳化物，这是因为添加 Cr 增加了（Mo,Cr）6C 中的 Cr 含量，降低了溶解温度和抑制晶粒长大的能力。铬使马氏体开始（Ms）温度从 263 ℃ 明显降低到 53.1 ℃，并使残余奥氏体从 0.3 Vol% 增加到 13.19 Vol%。铬增加了纳米级 M2C 的数量密度和直径，这是由于铬促进了 Mo 的溶解并提高了成核率。同时，较高的铬含量也提高了碳化物沿直径方向的增长速度。铬的添加减少了因晶格错配减少而导致的一致性增强，增加了因 M2C 体积分数和尺寸增大而导致的奥罗恩位错循环的贡献。

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.