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| DIFFRACTION CONTRAST STUDY ON MICROSTRUCTURE AND DEFORMATION PROCESS OF WC-Co CEMENTED CARBIDE |
| Liu Manlang; Huang Xiaoying; Duan Shitian; Shao Daqin; Cui Yumei; Yao Zhenmei (Central Iron and Steel Research Institute; Ministry of Metallurgical Industry; Beijing) |
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Cite this article:
Liu Manlang; Huang Xiaoying; Duan Shitian; Shao Daqin; Cui Yumei; Yao Zhenmei (Central Iron and Steel Research Institute; Ministry of Metallurgical Industry; Beijing). DIFFRACTION CONTRAST STUDY ON MICROSTRUCTURE AND DEFORMATION PROCESS OF WC-Co CEMENTED CARBIDE. Acta Metall Sin, 1982, 18(6): 689-770.
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Abstract The diffraction contrast study was carried out on the deformation and the crack propagation process of WC-12%Co cemented carbide and on the mechanism of phase transformation of binder Co by TEM including weak-beam technique. It indicates that the deformation behaviour of the alloy depends upon the coordinating strain ability of binder Co, and that the characteristic morphology of the crack propagation seems to bear a direct relation to the slip structure of WC with binder Co and the properties of interfaces. The cracks propagate linearly along the intra- and transgranular fracture of WC,WC/WC and along WC/Co interface as well, but zigzaggedly in the binder Co. The β-Co (fee) is unstable at room temperature and very easy to transform into ε-Co (hcp) even by a smaller driving force of the phase transformation, e. g. the alloy subjected to deformation. It may be believed that this transformation undergos the growth and thickening of the stacking faults lamellae in the β-Co and thereby the formation of a stable ε-Co of hcp structure finally.
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Received: 18 June 1982
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