Effect of Martensite–Bainite Duplex Microstructure on Carbide Precipitation and Mechanical Properties of M50 Steel

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY Accounts of Chemical Research Pub Date : 2024-09-10 DOI:10.1002/srin.202400570

Dongyue Zheng, Wenzeng Zhao, Xingfu Yu, Yong Su, Yinghua Wei

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Abstract

By means of microstructure observation, phase analysis, and mechanical‐property tests, the effect of martensite–bainite (M–B) duplex microstructure on carbide precipitation and mechanical properties of M50 steel is studied. In that results, it is shown that the distribution of secondary carbides in specimens with M–B duplex microstructure is more uniform and finer, and the stability of retained austenite (RA) in the steel is also improved, so that the content of RA in specimens with M–B duplex microstructure is 2.34%, which is higher than the 0.94% of the specimens with full martensite microstructure. The M–B duplex microstructure leads to the reduction of tempering hardness of M50 steel to 60.9 unit of Rockwell hardness (HRC), compared to the 61.6 HRC of the specimens with full martensite microstructure, but the wear resistance is slightly enhanced. Moreover, the M–B duplex microstructure effectively improves the impact toughness and fatigue properties by refining the microstructure and carbides in the steel, and the increase amplitude is 47.4% and 41.0%, respectively.

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马氏体-贝氏体双相显微结构对 M50 钢碳化物析出和机械性能的影响

通过显微组织观察、相分析和力学性能测试，研究了马氏体-贝氏体（M-B）双相显微组织对 M50 钢碳化物析出和力学性能的影响。结果表明，M-B 双相显微组织试样中的二次碳化物分布更均匀、更细小，钢中残余奥氏体（RA）的稳定性也有所提高，因此 M-B 双相显微组织试样中的 RA 含量为 2.34%，高于完全马氏体显微组织试样中的 0.94%。与全马氏体显微组织试样的 61.6 HRC 相比，M-B 双相显微组织导致 M50 钢的回火硬度降至 60.9 洛氏硬度单位（HRC），但耐磨性略有提高。此外，M-B 双相显微组织通过细化钢中的显微组织和碳化物，有效提高了冲击韧性和疲劳性能，提高幅度分别为 47.4% 和 41.0%。

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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.

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