Investigation on wear behaviors of high-vanadium high-speed steel compared with high-chromium cast iron under rolling contact condition
Investigation on wear behaviors of high-vanadium high-speed steel compared with high-chromium cast iron under rolling contact condition
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DOI：
10.1016/j.msea.2006.07.047
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发表时间：
2006-10-25
期刊：
影响因子：
6.4
通讯作者：
Rui, Long
中科院分区：
文献类型：
--
作者：
Xu Liujie;Xing Jiandong;Rui, Long
采用自配对滚动磨损试验机研究了高钒高速钢在滚动接触条件下的磨损性能，并与高铬铸铁进行了对比，利用电子显微镜分析了高钒高速钢的微观组织和失效行为。结果表明，高速钢的相对耐磨性是高铬铸铁的4倍。裂纹的萌生和扩展主要取决于碳化物的亚结构和形貌，从而决定材料的耐磨性。由于MC型纳米碳化物在VC中的强化作用，使HVHSS中的裂纹难以在VC中萌生。裂纹主要在VC/基体界面处萌生，并沿VC表面沿着扩展，导致裂纹钝化。而高铬铸铁的裂纹主要在M7 C3内部萌生，这是由于M7 C3内部位错的阻挡，导致M7 C3内部裂纹萌生点密集。这些密集裂纹在扩展一小段距离后，通过主裂纹相互连接形成裂纹，导致高铬铸铁的快速失效。(c)2006 Elsevier B. V.保留所有权利。
The wear property of high-vanadium high-speed steel (HVHSS), compared with high-chromium cast iron, was studied using self-mate rolling wear testing apparatus under rolling contact condition, and the microstructures and failure behaviors were analyzed by electron microscopes. Results show that the relative wear resistance of HVHSS is four times higher than that of high-chromium cast iron. The initiation and propagation of cracks mainly depend on the substructure and morphology of carbides, which determine wear resistance of materials. It is difficult for cracks in HVHSS to initiate inside VC because of the reinforcement of MC-type nano-particles carbides inside VC. The cracks mainly initiate at the VC/matrix interface, and propagate along surface of VC, resulting in crack blunting. Whereas, the cracks in high-chromium cast iron mainly initiate inside M7C3 because of blocking of dislocation inside M7C3, resulting in dense crack-initiation sites inside M7C3. After propagating a short distance, those dense cracks join each other to form through main crack, resulting in rapid failure of high-chromium cast iron. (c) 2006 Elsevier B.V. All rights reserved.