王实,孙建亮,彭艳,董志奎,邱丑武

• 1:燕山大学国家冷轧板带装备及工艺工程技术研究中心

摘要(Abstract)：

在Gleeble-3800热模拟试验机上通过高温等温压缩试验研究了20MND5钢在应变速率为0.001~10 s~(~(-1))、变形温度为950~1150℃的热变形行为及组织转变,研究了变形工艺对20MND5钢的热变形流动应力的影响规律,建立了其热变形本构方程。结果表明:在应变速率为0.001~0.1 s~(-1)时,20MND5钢的高温流变应力主要以动态再结晶软化机制为特征。在应变速率为1.0~10 s~(-1)时,真应力随应变量的增大而增大,但当应变速率为1.0 s~(~(-1)),变形温度达到1150℃时,发生明显的动态再结晶。综合考虑应变速率和变形温度对材料组织性能的影响,建立了基于本构方程的20MND5钢的热加工图,并确定了该钢的热变形流变失稳区及热变形过程的最佳工艺参数。分析讨论了不同区域的20MND5钢的高温变形特征,确定了20MND5钢在低温、中温及高温变形时,宜控制的应变速率及其应变量。

关键词(KeyWords)： 20MND5钢;本构方程;热加工图;动态再结晶

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(51305388);; 河北省高等学校青年拔尖人才计划项目(BJ2014055)

作者(Author): 王实,孙建亮,彭艳,董志奎,邱丑武

DOI: 10.13289/j.issn.1009-6264.2016.12.030

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