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

IF 1.9 3区材料科学 Q2 METALLURGY & METALLURGICAL ENGINEERING

steel research international 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

steel research international 工程技术-冶金工程

CiteScore

3.30

自引率

18.20%

发文量

319

审稿时长

1.9 months

期刊介绍： steel research international is a journal providing a forum for the publication of high-quality manuscripts in areas ranging from process metallurgy and metal forming to materials engineering as well as process control and testing. The emphasis is on steel and on materials involved in steelmaking and the processing of steel, such as refractories and slags. steel research international welcomes manuscripts describing basic scientific research as well as industrial research. The journal received a further increased, record-high Impact Factor of 1.522 (2018 Journal Impact Factor, Journal Citation Reports (Clarivate Analytics, 2019)). The journal was formerly well known as "Archiv für das Eisenhüttenwesen" and "steel research"; with effect from January 1, 2006, the former "Scandinavian Journal of Metallurgy" merged with Steel Research International. Hot Topics: -Steels for Automotive Applications -High-strength Steels -Sustainable steelmaking -Interstitially Alloyed Steels -Electromagnetic Processing of Metals -High Speed Forming