Effect of Trace Element B on the Microstructure and Mechanical Properties of 8Cr4Mo4V Bearing Steel

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2024-09-09 DOI:10.1002/srin.202400501

Xingfu Yu, Ze Wu, Tianci Hao, Yong Su, Ying Jia, Yinghua Wei

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引用次数: 0

Abstract

By means of salt‐bath austempering treatment, microstructure observation, X‐Ray diffraction analysis, microhardness measurement, and friction and wear performance tests for 8Cr4Mo4V steels with standard composition and with trace addition of 0.005% boron, the effect of boron on the phase composition and mechanical properties of the steel is studied. The results show that trace element boron greatly increases the content of needle‐like lower bainite in the quenched microstructure, promotes the dissolution of undissolved carbides, reduces the content of M/A island, but coarsens grains. After tempering, trace element B increases the amount of bainite generation, refines the lath martensite, and significantly promotes the precipitation of carbides, whose size is finer, and the distribution is more dispersed. In terms of mechanical properties, trace element B improves the hardness by promoting the precipitation of the second phase and refining the lath martensite, and the increase in the bainite content changes the wear mechanism and enhances the wear resistance.

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微量元素 B 对 8Cr4Mo4V 轴承钢微观结构和机械性能的影响

通过对标准成分和微量添加 0.005% 硼的 8Cr4Mo4V 钢进行盐浴奥氏体回火处理、显微组织观察、X 射线衍射分析、显微硬度测量以及摩擦和磨损性能测试，研究了硼对钢的相组成和机械性能的影响。结果表明，微量元素硼大大增加了淬火显微组织中针状下贝氏体的含量，促进了未溶解碳化物的溶解，降低了 M/A 岛的含量，但使晶粒变得粗大。回火后，微量元素 B 增加了贝氏体的生成量，细化了板条马氏体，并显著促进了碳化物的析出，碳化物的尺寸更细，分布更分散。在机械性能方面，微量元素 B 通过促进第二相的析出和细化板条马氏体提高了硬度，贝氏体含量的增加改变了磨损机理，增强了耐磨性。

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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.