孙正,赵飞,黄芳

• 1:贵州大学材料与冶金学院
• 2:贵州理工学院

摘要(Abstract)：

在Gleeble3500热模拟试验机上对中国低活化马氏体钢进行形变热处理,变形温度为850℃,形变量范围为15%~60%,应变速率为10 s-1,研究形变量对实验钢显微组织的影响。结果表明:形变热处理后,晶粒出现明显的细化,形变量为60%时晶粒细化最为显著,平均尺寸约为5μm;随着形变量的增加马氏体板条有细化的趋势,同时马氏体板条内部产生高密度位错,为纳米级颗粒碳氮化物MX相的形核提供有利位置,促进MX纳米级颗粒大量析出。当形变量为60%时MX纳米级颗粒数量最多,析出的MX纳米级颗粒进一步阻碍位错的滑移,钉扎位错,起到析出强化的作用,同时具有良好的韧性,从而改善高温力学性能,提高高温组织稳定性,以达到提高高温使用温度的目的。

关键词(KeyWords)： 中国低活化马氏体钢;形变热处理;形变量

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(51461008,51571066)

作者(Author): 孙正,赵飞,黄芳

DOI: 10.13289/j.issn.1009-6264.2018-0115

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