Finite element analysis of thermal residual stresses at cemented carbide rock drill buttons with cob

• 作 者: 黄自谦 贺跃辉 蔡海涛 肖逸锋 黄伯云
• 机 构: State Key Laboratory of Powder Metallurgy Central South University,State Key Laboratory of Powder Me
• 出 处: Transactions of Nonferrous Metals Society of China
• 发表日期: 2008年03期
• 关键词: compressive carbide rock functionally tensile graded cobalt constraint drill app

The aim of this study is to apply the concept of functionally graded materials(FGMs) to cemented carbides and to develop high-performance rock drill buttons. Cobalt-gradient structure was introduced to the surface zone of the buttons by carburizing process. Finite element method and XRD measurement were used to decide the distribution of thermal residual stress. Constitutive parameters were determined by constraint factor. Numerical results show that residual stresses of gradient buttons mainly concentrate in cobalt-gradient zone. There is compressive stress in the surface zone and tensile stress in the cobalt-rich zone. The maximum value of surface compressive stress is 180 MPa for WC-6Co cemented carbides. And the numerical results agree with the results of XRD measurement.

The aim of this study is to apply the concept of functionally graded materials (FGMs) to cemented carbides and to develop high-performance rock drill buttons. Cobalt-gradient structure was introduced to the surface zone of the buttons by carburizing process. and XRD measurement were used to decide the distribution of thermal residual stress. Constituent parameters were determined by constraint factor. Numerical results show that residual stresses of gradient buttons mainly concentrate in cobalt-gradient zone. There is compressive stress in the surface zone and tensile stress in the cobalt-rich zone. The maximum value of surface compressive stress is 180 MPa for WC-6Co cemented carbides. And the numerical results agree with the results of XRD measurement.