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Thermal residual stress analysis of coated diamond grits
Authors:Zi-qian Huang  Bo Xiang  Yue-hui He  Bai-yun Huang
Affiliation:1. state Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China
2. Zhejiang Huayou Cobalt Co. Ltd., Tongxiang 314500, China
Abstract:Residual stresses of coated diamond grits were analyzed by a finite element unit cell model.Diamond grits coated with four types of metals, W, Mo, Ti, and Cr, were considered.The numerical results show that compressive stress occurs in the diamond particles and tensile stress occurs in the metal matrix; compressive stress is concentrated in the diamond sharp comer; interface stresses decrease by more than 1000 MPa with a metal interlayer; plastic deformation of the matrix begins near the sharp comer of diamond grits and extends toward the peripheral zone.Stress concentration dramatically decreases due to plastic deformation of the matrix.The deposition of transition metals on a diamond surface can dramatically promote the adhesion between diamond grits and the metal bond.
Keywords:diamond grit  residual stress  interlayer  finite element method
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