Dissolving and Precipitating Characteristics of WC and Carbides in the Ni60A+WC Graded Coating
YUAN You-lu1,2, LI Zhu-guo2
1. School of Materials Science and Engineering, Hubei University of Automotive Technology, Shiyan 442002, Hubei, China;
2. School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
Abstract：The dissolution and precipitation of WC in the multilayered Ni60A+WC reinforced Fe-based graded coating fabricated by Plasma cladding were studied, in which the content of Ni60A+WC increased by 10%mass fraction layer by layer. The results show that the dissolution of WC in each layer of the graded coating during the plasma cladding heating stage was closely related to the particle size and inner defect. The dissolution characteristics of WC are classified into four types: diffusing, core dissolution, crumbling, and diffusing complex core-dissolution. The shape characteristics of the precipitated W-rich carbides in the graded coating during the solidification process are relevant to the contents of Ni60A+WC. With the increasing of the contents for the Ni60A+WC from 10% to 50%, the shapes of W-rich carbides are transferred from reticulation, grain, grain mixed with block, block mixed with cluster to big block mixed with equiaxial structures, and the quantity of the precipitated W-rich carbides increased layer by layer. As a result, the hardness of the graded coating linearly increases gradually.
袁有录, 李铸国. Ni60A+WC增强梯度涂层中WC的溶解与碳化物的析出特征[J]. 材料工程, 2013, 0(11): 12-19,25.
YUAN You-lu, LI Zhu-guo. Dissolving and Precipitating Characteristics of WC and Carbides in the Ni60A+WC Graded Coating. Journal of Materials Engineering, 2013, 0(11): 12-19,25.
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