张春玲,杨金凤,孔玉婷,蔡大勇

• 1:燕山大学亚稳材料制备技术与科学重点实验室

摘要(Abstract)：

采用Gleeble-3500热模拟试验机进行单道次等温热压缩试验,分析研究了Cu-P-Cr-Ni-Mo耐候钢在不同温度、不同应变量和不同应变速率下的组织演变和铁素体晶粒细化机制。结果表明,Cu-P-Cr-Ni-Mo耐候钢在875℃变形时铁素体的析出机制为形变诱导相变(DIFT)。随应变量增加,铁素体转变量先缓慢增加后急剧增加再缓慢增加的S形曲线特征;铁素体晶粒尺寸随应变量增加而减小,当应变为1.6时,铁素体平均晶粒尺寸最小,大约为3μm。在0.01~30 s-1的应变速率下,随应变速率增加,铁素体转变量增加,铁素体晶粒尺寸减小,当应变速率为30 s-1时,铁素体平均晶粒尺寸最小,约为1.9μm。Cu-P-Cr-Ni-Mo耐候钢在875℃变形时,铁素体晶粒细化机制为形变诱导铁素体相变和铁素体的动态再结晶。

关键词(KeyWords)： Gleeble-3500;热压缩;形变诱导相变;铁素体细化

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(51104130);; 河北省自然科学基金(E2012203137)

作者(Author): 张春玲,杨金凤,孔玉婷,蔡大勇

DOI: 10.13289/j.issn.1009-6264.2015.02.012

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