龚志华,定巍,王宝峰

• 1:内蒙古科技大学材料与冶金学院

摘要(Abstract)：

利用高温拉伸试验机测试了S30432钢650℃长时时效过程中的高温力学性能,利用光学显微镜OM、扫描电镜SEM、X射线衍射XRD、透射电镜TEM等方法观察了其微观组织和析出相,研究了析出相对S30432高温性能的影响规律。高温拉伸试验结果表明,在长时时效过程中S30432钢的强度降低不明显,但其塑性在时效100 h后急剧下降。微观组织观察表明,在长时时效期间,大量析出的M23C6相、纳米级的富铜相以及MX相共同阻碍位错和晶界的运动,抵消了因高温下位错密度降低、孪晶减少引起的强度降低,因此强度下降不明显;随着时效时间延长,尤其是当时效时间超过100 h后,大量M23C6在晶界析出并聚集长大,弱化晶界,从而导致塑性急剧下降。

关键词(KeyWords)： 长时时效;高温性能;M23C6;富铜相

Abstract:

Keywords:

基金项目(Foundation): 内蒙古自然基金(2012MS0803);; 内蒙古高校基金(NJZY13142);; 材料学院孵化基金(2014CY012)

作者(Author): 龚志华,定巍,王宝峰

DOI: 10.13289/j.issn.1009-6264.2015.11.015

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