中国机械工程2025，Vol.36Issue(10)：2179-2189,11.DOI:10.3969/j.issn.1004-132X.2025.10.003
8Cr4Mo4V轴承钢微观裂纹萌生与扩展机制的分子动力学模拟
Molecular Dynamics Simulation of Microscopic Crack Initiation and Extension Mechanism in 8Cr4Mo4V Bearing Steels
摘要
Abstract
To investigate the influences of cementite on the mechanics properties of the matrix and the initiation and propagation of microcracks in 8Cr4Mo4V bearing steels,molecular dynamics models were used to systematically analyze the effects of cementite's geometric parameters(such as shape,size,and po-sition)on crack initiation and extension mechanism.And combined with cohesive force theory,the charac-teristics of interface crack propagation were studied.The results indicate that cementite significantly en-hances the mechanics properties of the bcc-Fe matrix,with smaller cementite particles providing a more pronounced strengthening effectiveness.While the shape and position of cementite exert a relatively minor impact on overall mechanics performance,sharper inclusions accelerate crack propagation,and the position of inclusions determines the crack propagation path.Furthermore,interfaces between the bcc-Fe matrix and cementite,as well as twin boundaries with larger misorientation angles,exhibit increased resistance to crack initiation and propagation.关键词
8Cr4Mo4V轴承钢/渗碳体/分子动力学/裂纹扩展/内聚力参数Key words
8Cr4Mo4V bearing steel/cementite/molecular dynamics/crack extension/cohesive pa-rameter引用本文复制引用
马天宇,巩固,曹宏瑞,史江海,尉询楷,章立军..8Cr4Mo4V轴承钢微观裂纹萌生与扩展机制的分子动力学模拟[J].中国机械工程,2025,36(10):2179-2189,11.基金项目
国家科技重大专项(J2019-Ⅳ-0004-0071) （J2019-Ⅳ-0004-0071）
材料服役安全研究评价设施开放项目(MSAF-2023-004) （MSAF-2023-004）
