赵睿澍,孙俊杰,王浩,柳永宁

• 1:西安交通大学金属材料强度国家重点实验室

摘要(Abstract)：

以50CrV弹簧钢为研究对象，采用感应热处理细化其晶粒，研究了细化晶粒对其力学性能和马氏体相变亚结构的影响。结果表明：感应热处理一次就可以将试验钢的晶粒尺寸由起始态的31.9μm细化到11.8μm,进一步增加感应热处理到5次，晶粒细化到9.8μm,细化的效果减弱。力学性能测试表明：常规热处理试样(850℃淬火及250℃回火2 h)表现出脆性状态，强度达到1655 MPa,伸长率只有0.9%,断口是沿晶断裂；感应淬火试样同样在250℃回火2 h,一次感应处理后强度达到了2180 MPa,伸长率恢复到2.5%;感应处理5次后抗拉强度没有进一步提升，但是伸长率达到了7.2%,断口由沿晶转变为以韧窝为主的断裂模式。透射电镜分析结果表明：常规热处理试样的马氏体亚结构以孪晶为主，而感应处理5次的试样中马氏体亚结构以位错为主，这表明细化晶粒对高碳马氏体亚结构有影响，粗晶(常规晶粒尺寸)是孪晶亚结构而细晶是位错亚结构。

关键词(KeyWords)： 50CrV弹簧钢;细化晶粒;循环热处理;力学性能;马氏体亚结构

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(51801144);; 陕西省自然科学基金(2020JQ-049)

作者(Author): 赵睿澍,孙俊杰,王浩,柳永宁

DOI: 10.13289/j.issn.1009-6264.2021-0574

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