谭玄,关富禧,宋新莉,尤学文,邱元元

• 1:武汉科技大学省部共建耐火材料与冶金国家重点实验室

摘要(Abstract)：

采用扫描电镜、透射电镜、X射线衍射仪和万能拉伸试验机等研究了不同温度回火对55CrVNb弹簧钢组织演变与力学性能影响。结果表明：55CrVNb弹簧钢淬火后的组织主要是板条与针状马氏体；在250～550℃回火50 min时，随着回火温度的升高，马氏体板条模糊并逐渐消失，碳化物沿马氏体边界析出，数量增多尺寸也在增大，位错密度逐渐降低，固溶强化，位错强化、析出强化作用减弱，导致55CrVNb弹簧钢的强度降低，抗拉强度从2119.7 MPa下降至1228.0 MPa,屈服强度从1918.8 MPa下降至1188.9 MPa;随着回火温度升高，55CrVNb弹簧钢的伸长率呈现先升高后降低趋势，断裂类型由脆性断裂向韧性断裂转变；实验钢最佳的热处理工艺参数为：860℃奥氏体化30 min, 450℃回火50 min。

关键词(KeyWords)： 弹簧钢;回火温度;组织;力学性能

Abstract:

Keywords:

基金项目(Foundation):

作者(Author): 谭玄,关富禧,宋新莉,尤学文,邱元元

DOI: 10.13289/j.issn.1009-6264.2023-0456

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