霍存龙,霍元明,何涛,贾昌远,杨万博,刘克然

• 1:上海工程技术大学机械与汽车工程学院

摘要(Abstract)：

在高温低速压缩的条件下,采用Gleeble-3800型热模拟试验机对40CrNiMo钢进行了热模拟试验。研究了40CrNiMo钢在高温(850、950、1050℃)、低应变速率(0.01、0.1、1 s~(-1))条件下的变形行为及微观组织演变。分析了峰值应变(σ_p)与温度和应变速率的关系以及流变曲线与加工硬化率关系。分析了温度、应变速率以及不同变形程度对动态再结晶晶粒的影响。结果表明:40CrNiMo钢的流变应力与温度呈负相关,与应变速率呈正相关;流变曲线表现为4种类型:加工硬化型、动态回复型、动态再结晶型以及二次加工硬化型。在变形温度为1050℃,应变速率为0.01和0.1 s~(-1)的两条曲线上出现了二次加工硬化现象,结合光学显微组织分析了高温低速变形时出现二次硬化的原因是由于再结晶形核后有充足的长大时间,形成了较稳定的等轴晶,变形抗力增加。40CrNiMo钢再结晶晶粒的大小与变形温度成正比,而与应变速率成反比。采用直线截点法测得40CrNiMo钢不同变形程度区的平均晶粒尺寸分别为35.38、59.09和74.12μm。

关键词(KeyWords)： 40CrNiMo钢;热变形行为;二次加工硬化;微观组织

Abstract:

Keywords:

基金项目(Foundation): 国家重点研发计划(2018YFB1307900);; 国家自然科学基金青年基金(51805314);; 上海市科委重点攻关资助项目(16030501200)

作者(Author): 霍存龙,霍元明,何涛,贾昌远,杨万博,刘克然

DOI: 10.13289/j.issn.1009-6264.2021-0119

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