曹宇,宋新莉,黄昌虎,贾涓,范丽霞,刘中柱

• 1:武汉科技大学耐火材料与冶金国家重点实验室
• 2:中信微合金化技术中心

摘要(Abstract)：

为了研究奥氏体化温度与Nb含量对51CrV弹簧钢组织与力学性能的影响,本文以3种不同Nb含量的51CrV弹簧钢为研究对象,并对其进行了800、830、860和900℃奥氏体化1 h后淬火及450℃回火热处理。采用扫描电镜(SEM)、透射电镜(TEM)、能谱仪(EDS)以及万能拉伸试验机等研究了实验钢经不同热处理后的组织、析出相及力学性能。结果表明:3种不同Nb含量的实验钢在800℃奥氏体化,渗碳体没有完全溶入奥氏体。随着奥氏体化温度升高到900℃,不含Nb的实验钢淬火马氏体板条更粗大。淬火实验钢在450℃回火后的组织是回火屈氏体,添加Nb实验钢回火后铁素体基体仍呈板条状,合金碳化物更细小。3种实验钢经不同温度淬火及450℃回火后的屈服强度均大于1300 MPa,但是不含Nb实验钢伸长率小于10%,而添加0.02 mass%Nb实验钢伸长率大于11%。其中含Nb为0.02 mass%的实验钢在860℃淬火及450℃回火后综合力学性能最佳:屈服强度1394 MPa,抗拉强度1452 MPa,伸长率11.38%。

关键词(KeyWords)： 弹簧钢;铌微合金化;奥氏体化温度;力学性能

Abstract:

Keywords:

基金项目(Foundation): 中信-CBMM基金(2017FWNB-3082)

作者(Author): 曹宇,宋新莉,黄昌虎,贾涓,范丽霞,刘中柱

DOI: 10.13289/j.issn.1009-6264.2020-0235

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