Impact wear resistance of WC/Hadfield steel composite and its interfacial characteristics
Impact wear resistance of WC/Hadfield steel composite and its interfacial characteristics
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DOI：
10.1016/j.wear.2005.04.010
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发表时间：
2006-04-07
期刊：
影响因子：
5
通讯作者：
Gao, YL
中科院分区：
文献类型：
--
作者：
Zhang, GS;Xing, HD;Gao, YL
采用离心铸造工艺制备WC/Hadfield钢复合涂层，以提高Hadfield钢在低或中等冲击能条件下的抗冲击磨损性能。采用扫描电子显微镜（SEM）、能量色散X射线光谱（EDX）和X射线衍射（XRD）分析了WC陶瓷颗粒与钢基体之间的界面结构。在MLD-10型冲击磨损试验机上进行了不同冲击功下的冲击磨损试验，研究了3种不同WC粒径复合材料的耐磨性能。为了进行比较，哈德菲尔德钢也在相同条件下进行了磨损试验。结果表明，在离心铸造过程中，WC颗粒部分溶解在钢中。钢中的元素W、C和Fe反应形成新的碳化物，例如Fe3W3C或M23C6，这些碳化物在先前的WC颗粒周围沉淀，在随后的凝固过程中形成细颗粒。因此WC颗粒与哈德菲尔德钢基体之间的界面是牢固的冶金结合。无论冲击能水平如何，用更小的WC颗粒增强的复合材料都比Hadfield钢具有更好的抗冲击磨损性能。而较大WC颗粒增强的复合材料在冲击功较小时比Hadfield钢具有更好的抗冲击磨损性能，但在冲击功较高时却得到相反的结果。因此，选择合适尺寸的WC颗粒作为哈德菲尔德钢的增强体，使复合材料在使用条件下更加耐用是非常必要的。 (c) 2005 Elsevier B.V. 保留所有权利。
A composite coating of WC/Hadfield steel was fabricated through centrifugal casting process to improve the impact wear resistance of Hadfield steel under the conditions of low or medium impact energy. The interfacial structure between WC ceramic particle and the steel matrix was analyzed with scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX) and X-ray diffraction (XRD). The impact wear tests at different impact energy were carried out on a MLD-10 type impact wear rig to investigate the wear-resistant properties of three kinds of composites with different WC particle sizes. For comparison, the wear tests of Hadfield steel were also carried out under the same conditions. The results show that WC particles are partially dissolved in the steel during centrifugal casting. The elements W, C and Fe in steel react to form new carbides such as Fe3W3C or M23C6, which precipitate around former WC particles forming fine particles during subsequent solidification. So the interface between WC particles and Hadfield steel matrix is a strong metallurgical bonding. The composite reinforced with smaller WC particles has better impact wear resistance than that of Hadfield steel regardless of impact energy level. Whereas, the composite reinforced with larger WC particles has better impact wear resistance property than that of Hadfield steel when the impact energy is small but an opposite result is gained when the impact energy is higher. So, it is very essential to choose suitable size of WC particles as reinforcement in Hadfield steel to make the composite material more durable in the service conditions. (c) 2005 Elsevier B.V. All rights reserved.