无机材料学报

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残余应力对陶瓷/硬质合金复合片硬度的影响

周建强; 艾兴; 李兆前; 邓建新   

  1. 山东工业大学机械工程学院; 济南250061
  • 收稿日期:1997-07-17 修回日期:1997-09-10 出版日期:1998-08-10 网络出版日期:1998-08-10

Effect of Residual Stresses on the Hardness of Ceramic/Cemented Carbide Compacts

ZHOU Jian-Qiang; Al Xing; LI Zhao-Qian; DENG Jian-Xin   

  1. College of Much. Eng.; Shandong University of Technology Jinan 250061 China
  • Received:1997-07-17 Revised:1997-09-10 Published:1998-08-10 Online:1998-08-10

摘要: 分析了残余剪应力对材料硬度的影响,导出了残余剪应力与硬度压头下最大剪应力的关系式.分析表明,残余剪应力与残余正应力不同,无论其方向如何,总是使材料硬度下降.通过实验证明,陶瓷/硬质合金热压复合片界面附近,残余剪应力使硬度下降的值大于由于残余压应力使硬度升高的值.据此分析认为,当陶瓷层热膨胀系数比硬质合金层小,而且太薄时,虽然可以在陶瓷层形成较大的残余压应力,但因残余剪应力的影响,表层的硬度不仅不会升高,反而会降低.

关键词: 残余应力, 硬度, 陶瓷/硬质合金, 热压烧结

Abstract: The effect of residual shear stress on the hardness of materials was considered and the relationship between the residual shear stress and the maximum shear strss
induced by hardness pressure head was also deduced. The analysis indicates that the residual shear stress reduces the hardness of materials whatever its direction
which is different from the residual normal stress. The decease value of hardness by residual shear stress is larger than the increase value of hardness by compressive
stress near the interface of the ceramic/cemented carbide compact. According to this, it is considered that the hardness of the ceramic surface not only can’t increase
but also decrase due to the effect of the residual shear stress, although larger residual compressive stress can be formed in the ceramic when the ceramic is too thin
and its thermal expansion coefficient is smaller than that of the cemented carbide.

Key words: residual stresses, hardness, ceramic/cemented carbide, hot-press

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