马宁,胡平,郭威

• 1:大连理工大学工业装备结构分析国家重点实验室运载工程与力学学部汽车工程学院
• 2:吉林大学材料科学与工程学院

摘要(Abstract)：

对热成形硼钢进行高温拉伸及淬火实验。试验方法为:硼钢板材试样在奥氏体化(950℃)后保温5min,然后在连续冷却的同时施加拉伸力,记录此过程中力、位移、膨胀量及温度的变化。试验结果表明,当应力小于某个值时,马氏体相变开始温度、转变速率材料常数及相变塑性系数基本不变;当应力在一定范围内变化时,上述物理量随应力的增加而增加;当应力大于某个值时,上述物理量趋于定值;当应力达到400MPa时,马氏体相变开始温度达到565℃,提高了180℃左右。在分析上述物理量的变化规律与马氏体形核影响因素的基础上,发展了热成形硼钢相变过程中的热、力、相变耦合本构模型。

关键词(KeyWords)： 热成形(热冲压);热、力、相变耦合;奥氏体化;本构模型

Abstract:

Keywords:

基金项目(Foundation): 国家高技术研究发展计划(863计划)(2009AA04Z101);; 国家自然科学基金重点项目(10932003);; 国家重大基础研究发展计划(973计划)(2010CB832700)

作者(Author): 马宁,胡平,郭威

DOI: 10.13289/j.issn.1009-6264.2010.11.015

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