张世伟,梁益龙,姜云,龙绍檑,孙皓,杨明

• 1:贵州大学材料与冶金学院
• 2:贵州省材料结构与强度重点实验室
• 3:高性能金属结构材料与制造技术国家地方联合工程实验室

摘要(Abstract)：

在DIL805A/T热模拟试验机上对20CrNi2Mo板条马氏体钢进行了等温单道次轴向热压缩试验,结合光学显微镜(OM)、扫描电镜(SEM)、电子背散射衍射(EBSD)和显微硬度计,研究了形变量对20CrNi2Mo钢板条马氏体组织演变规律和力学性能的影响。结果表明:20CrNi2Mo钢在压缩变形过程中极易发生动态再结晶,动态再结晶开始的临界应变为0.22。当变形量小于临界应变时,原奥氏体晶粒尺寸变化不大,板条束尺寸增加,板条块宽度减小,小角度晶界所占比例逐渐增大,大角度晶界所占比例逐渐减少;当变形超过临界应变后,随着变形量的增加,原奥氏体晶粒、板条束、板条块逐渐被细化,小角度晶界所占比例先略有减小后逐渐增大。极图分析表明,20CrNi2Mo钢在形变过程中板条块取向逐渐呈现择优分布。

关键词(KeyWords)： 板条马氏体20CrNi2Mo钢;热压缩;EBSD;动态再结晶;临界应变

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(51461006,51671060)

作者(Author): 张世伟,梁益龙,姜云,龙绍檑,孙皓,杨明

DOI: 10.13289/j.issn.1009-6264.2017-0182

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