信振飞,迟宏宵,于杰,周健,谷金波

• 1:昆明理工大学材料科学与工程学院
• 2:钢铁研究总院特殊钢研究所

摘要(Abstract)：

利用光学显微镜(OM)、扫描电镜(SEM)、透射电镜(TEM)、X射线衍射仪(XRD)、拉伸试验和洛氏硬度计等研究了一种新型成分优化的超高强度轴承钢经不同工艺热处理后的微观组织及力学性能。结果表明，在1040～1080℃范围内，随着固溶温度的升高，试验钢的抗拉强度逐渐升高，屈服强度逐渐降低。试验钢经1060℃固溶1 h后油淬及两次(-73℃冷处理2 h+540℃回火2 h)处理后，抗拉强度达到1997 MPa,屈服强度达到1600 MPa,断后伸长率达到12%,断面收缩率为55%,具有优异的强韧性能；随固溶温度的升高，试验钢的原始奥氏体晶粒尺寸逐渐增大，从19μm增加到50.9μm,未溶碳化物含量明显减少，残留奥氏体含量逐渐增多，其中，残留奥氏体含量增多是导致屈服强度逐渐降低的主要原因；试验钢中大量存在M_6C和Laves两种不同种类的析出相，其中M_6C碳化物在固溶阶段起到细化晶粒作用，Laves相在回火过程弥散析出，是试验钢获得超高强度的主要强化机制。

关键词(KeyWords)： 轴承钢;超高强度;板条马氏体;析出相;位错密度;M_6C碳化物

Abstract:

Keywords:

基金项目(Foundation): 国家科技重大专项经费资助(J2019-VI-0019-0134)

作者(Author): 信振飞,迟宏宵,于杰,周健,谷金波

DOI: 10.13289/j.issn.1009-6264.2022-0535

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