Author(s): ZHANG Zhong-jian, ZHAO Sheng-zhi, PENG Wen, ZHANG Qian-xia, CHEN Ding
Pages: 3031-3041
Year: 2014 Issue:  12
Journal: The Chinese Journal of Nonferrous Metals
Keyword:  cemented carbide; fatigue crack; initiation; propagation;
Abstract: Cemented carbides are often served in extreme environments, under which they need to suffer mutual influence of cyclic stress, temperature (such as high temperature and cyclic temperature) and corrosive environment. Various fatigue fracture mechanisms, such as mechanical fatigue, thermal fatigue and corrosion fatigue, are the main reasons for the failure of the alloys. In terms of the fatigue crack initiation and propagation, the fatigue performance in cemented carbide was systematically discussed. The analysis shows that the fatigue crack is prone to initiate at coarse WC grains, pores, inclusions or binder phase pools, while the propagation performance of fatigue crack is influenced by various factors, including external factors of stress ratio, frequency, temperature and environment, and internal factors of microstructure and chemical composition.