陈振华,姜勇,樊恋,张忠健,徐涛,彭文

• 1:湖南大学材料科学与工程学院
• 2:株洲硬质合金集团有限公司

摘要(Abstract)：

对YG8和YG25两种WC-Co硬质合金不同时间深冷处理后的力学性能和疲劳性能进行了研究,利用X射线衍射方法分析了深冷前后合金的相变和残余应力变化,通过扫描电子显微镜(SEM)观察了材料的断口形貌和断裂方式。结果表明:深冷处理能有效提高了WC-Co硬质合金的硬度、强度、耐磨性和疲劳寿命。深冷处理时间是最主要的工艺参数,对YG8合金来说,2 h为深冷处理最佳工艺时间,而YG25则为8 h。其性能变化的主要原因是深冷处理导致硬质合金表面残余应力的变化和Co粘结相发生马氏体相变。

关键词(KeyWords)： 硬质合金;深冷处理;力学性能;疲劳;断裂

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(50804015)

作者(Author): 陈振华,姜勇,樊恋,张忠健,徐涛,彭文

DOI: 10.13289/j.issn.1009-6264.2011.07.008

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