王猛,孙明雪,李成刚,刘振宇

• 1:东北大学轧制技术及连轧自动化国家重点实验室

摘要(Abstract)：

通过拉伸和冲击试验以及SEM、TEM和EBSD组织观察,研究了不同热处理工艺参数对3.5Ni钢显微组织和力学性能的影响。结果表明:3.5Ni钢在860℃保温1 h水淬后得到细小的板条马氏体(LM)加粒状贝氏体(GB)组织;570℃回火后,LM的板条变粗,GB中的M/A岛也溶解消失,基体上有大量渗碳体析出。随着回火温度的升高,板条继续合并长大,并且开始出现多边形铁素体,渗碳体也不断长大。回火温度为570~600℃时,低温韧性随回火温度的升高而增加,但是继续升高回火温度会使得低温韧性下降。研究表明:3.5Ni低温钢经860℃水淬+600℃回火的热处理可以获得最佳的力学性能。

关键词(KeyWords)： 3.5Ni低温钢;调质热处理;渗碳体;低温韧性;大角度晶界

Abstract:

Keywords:

基金项目(Foundation): 中央高校基本科研业务费专项资金(N120807001)

作者(Author): 王猛,孙明雪,李成刚,刘振宇

DOI: 10.13289/j.issn.1009-6264.2015.03.016

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