王立军,余伟,武会宾,蔡庆伍

• 1:北京科技大学高效轧制国家工程研究中心

摘要(Abstract)：

采用XRD、TEM等实验方法研究了Si含量对超高强钢回火过程残留奥氏体稳定性及其力学性能的影响。结果表明,Si对抑制回火脆性和提高回火抗力具有有益作用;Si抑制残留奥氏体的分解,随Si含量提高,回火过程逐渐出现逆转奥氏体;Si对提高碳分配作用显著,可增强残留奥氏体的稳定性。马氏体板条内部,Si与C原子相互排斥;而奥氏体内Si与C相互吸引。发现1.8%Si钢250℃回火后出现ε-碳化物;400℃回火后ε-碳化物明显粗化,导致回火脆性。对0.4%Si钢而言,导致回火脆性的是回火后出现的大量针状或长条状碳化物,确定这类碳化物为非ε-碳化物。探讨了Si对回火过程残留奥氏体分解及逆转奥氏体形成的作用机理。

关键词(KeyWords)： Si;超高强钢;残留奥氏体;回火稳定性;逆转奥氏体

Abstract:

Keywords:

基金项目(Foundation): “十一五”国家科技支撑计划资助项目(2006BAE03A06)

作者(Author): 王立军,余伟,武会宾,蔡庆伍

DOI: 10.13289/j.issn.1009-6264.2010.10.012

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