标题：In-suit growth mechanism and hardness of W2C under non-equilibrium solidification conditions
作者：Chi, Jing ;Li, Hui-Qi ;Wang, Shu-Feng ;Li, Min ;Wu, Jie ;Li, Jian-Nan ;Zhao, Jian
作者机构：[Chi, Jing ;Li, Hui-Qi ;Wang, Shu-Feng ;Li, Min ;Wu, Jie ;Li, Jian-Nan ;Zhao, Jian ] College of Materials Science and Engineering, Shandong University 更多
来源：Zhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals
摘要：WpC-Fe composites were successfully fabricated by direct current arc in-situ metallurgy. Through the examination of phase composition, microstructure and hardness for the resultant materials, the in-situ growth mechanism and morphology transformation for W2C as well as the influence of content and shape of W2C on hardness were also carried out. The results show that, when the temperature of molten pool over 1652 K, W2C is formed more easily than WC in the in-situ reaction between W and C. During the non-equilibrium solidification process, the growth mechanism of W2C transits from lateral growth to non-lateral growth, the morphology gradually deviates from the petal-like shape with hexagonal symmetry determined by crystal structure, and grows into directional dendrite with the pattern of parallel intergrowth. The microhardness of W2C is lower than that of WC, and influenced by shape. 1993 HV0.2of the equiaxed dendrite is higher significantly than 1536HV0.2of the directional dendrite. As the current increasing from 600 A to 1000 A, the W2C content increases, and the hardness of materials decreases to 78HRA from 84HRA.
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