王敬忠,刘阿娇,丁凯伦,李科元

• 1:西安建筑科技大学冶金工程学院
• 2:陕西省耐磨材料工程技术研究中心
• 3:钢铁研究总院特殊钢所

摘要(Abstract)：

利用Gleeble3800热模拟试验机对20Cr-25Ni-1.5Mo Nb Ti N奥氏体耐热钢在温度为930~1230℃、应变速率为0.005~5 s-1条件下进行热压缩试验,获得不同热压缩条件下的流变应力曲线,用光学显微镜观察热压缩试样的显微组织。结果表明:变形温度相同时,随应变速率增大动态再结晶程度逐渐减小,甚至完全处于加工硬化状态,其热激活能为328 k J/mol;当应变速率为5 s-1、变形温度为1130~1230℃、应变量较小时和应变速率为0.005 s-1、变形温度930~1230℃、应变量较大时,出现失稳现象;动态再结晶的临界应力与Z参数之间成线性关系,峰值应力与应变速率和变形温度也有线性关系。

关键词(KeyWords)： 20Cr-25Ni-1.5MoNbTiN耐热钢;流变应力;Z参数;显微组织

Abstract:

Keywords:

基金项目(Foundation): 陕西省教育厅专项科研计划项目(15JK1424)

作者(Author): 王敬忠,刘阿娇,丁凯伦,李科元

DOI: 10.13289/j.issn.1009-6264.2017-0562

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