李元元,蔡东东,程晓敏,邹军,赵莉芳

• 1:武汉理工大学材料科学与工程学院
• 2:重庆长安汽车股份有限公司欧尚汽车事业部冲压二车间
• 3:湖北神风汽车弹簧有限公司技术质量部

摘要(Abstract)：

利用光学显微镜(OM)、扫描电镜(SEM)、电子探针(EPMA)分析弹簧钢过早发生疲劳断裂的原因,研究热处理工艺对51CrV4弹簧钢的显微组织和力学性能的影响。结果表明:热处理过程中淬火温度过高导致晶粒度等级偏低,为6.5级,马氏体组织粗大,并且表面出现全脱碳层,总脱碳层厚度为301.56μm,疲劳试样的扫描形貌是沿晶断裂,属于脆性断裂;经过在860℃下保温40 min油淬、随后在450℃下回火保温90 min的优化热处理工艺处理后,弹簧钢的综合性能最佳,抗拉强度和屈服强度分别为1678 MPa和1293 MPa,断后伸长率和断面收缩率为8.9%和42.5%,回火硬度为45.2 HRC,疲劳断口为塑性断裂,疲劳寿命由6.3万次提升到11万次,满足弹簧钢的性能要求。

关键词(KeyWords)： 51CrV4弹簧钢;晶粒度;显微组织;疲劳断口

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(51206125)

作者(Author): 李元元,蔡东东,程晓敏,邹军,赵莉芳

DOI: 10.13289/j.issn.1009-6264.2018-0024

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