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高速切削淬硬钢主剪切区绝热剪切失稳微观机理研究

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Indexed by:期刊论文

Date of Publication:2010-07-15

Journal:大连理工大学学报

Included Journals:EI、PKU、ISTIC、CSCD、Scopus

Volume:50

Issue:4

Page Number:502-507

ISSN No.:1000-8608

Key Words:高速切削 锯齿状切屑 主剪切区 绝热剪切失稳

Abstract:使用光学显微镜、扫描电子显微镜(SEM)和透射电子显微镜(TEM)对高速切削淬硬30CrNi3MoV高强度钢形成的锯齿状切屑主剪切区内材料微观特征进行了观察,并对绝热剪切失稳的微观机理进行了分析.微观观察和分析结果表明,绝热剪切带中心由平均直径0.4~0.6μm的细小等轴晶粒组成,过渡区内为碎化并沿剪切方向拉长的马氏体板条组织.锯齿状切屑的形成应归因子主剪切区材料绝热剪切失稳的发生,在此过程中,动态回复和再结晶成为微结构演化的主要冶金过程,绝热温升起到了关键作用.等轴晶组织的形成机制为旋转式动态再结晶.

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