含Nb微合金钢时效过程中双硬化峰的形成Formation of Two Hardening Peaks in Nb-Containing Microalloyed Steel during Aging
苑少强,武会宾,杨善武,尚成嘉,贺信莱
摘要(Abstract)：
运用热模拟方法,结合萃取复型、硬度测量及透射电子显微镜观察(TEM)等方法,研究了含Nb微合金钢经85 0℃热变形并弛豫不同时间后、水淬并在5 2 5℃时效时的硬度变化及析出行为。结果表明:变形奥氏体弛豫一定时间淬火后,在时效过程中出现双硬化峰现象;而奥氏体变形后直接淬火或长时间弛豫(10 0 0s)则没有第一个硬化峰出现。对比C Mn钢的分析结果证明Nb是产生硬化峰的重要原因。电镜观察的初步结果显示,变形奥氏体中形成的细小析出在时效过程中逐渐长大,已粗化的析出颗粒在5 2 5℃等温时效时变化不明显;而经过γ→α相变后α相中过饱和的Nb在时效时会重新析出,形成第二个硬化峰。
关键词(KeyWords)： Nb微合金钢;弛豫;时效析出;硬化峰
基金项目(Foundation): 国家“8 63”研究发展计划 (2 0 0 3AA0 0 1 0 2 0 ) ;; 唐山市科技攻关项目 (0 4 360 80 2B 5)
作者(Author): 苑少强,武会宾,杨善武,尚成嘉,贺信莱
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