摘要
为了解决严苛工况下的磨损问题,利用WC颗粒和中珞钢粉末,采用热压烧结法制备了局域化增强的钢结硬质合金/中珞钢复合材料,观察分析了复合材料界面,研究了试验载荷对复合材料相对耐磨性的影响规律及其磨损机理。结果表明:采用热压烧结法制备的局域化增强复合材料界面结合良好,增强区域组织致密,WC颗粒分布均匀;复合材料的耐磨性远高于中珞钢的,且其相对耐磨性随着试验载荷的增加而增大;在较高试验载荷下,复合材料的耐磨性优势更为显著,加载30 N时复合材料的相对耐磨性达到中鎔钢的3.7倍;在磨损过程中,凸出磨损面的增强区域对基体区域的有效保护作用和基体区域对增强区域的有效支撑作用,两者相互配合是复合材料具有优异耐磨性的主要原因;复合材料的磨损失效机理主要是显微切削和多次塑变疲劳断裂。
In order to solve the wear problems in harsh conditions, zoning reinforcement steel bonded carbide/medium Cr steel composite was fabricated with WC particles and medium Cr steel powders by hot pressing sintering. The composite interface was observed and analyzed to study the influence of test load on the relative wear resistance of composite and the wear mechanism of composite. Results showed that the zoning reinforcement composite was successfully prepared by hot pressing sintering, and the composite interface between enhanced region and matrix region was well bonded. In addition, the texture of enhanced area was compact and the WC particles were evenly distributed in enhanced area. The wear resistance of composite was much higher than that of medium Cr steel, and the relative wear resistance of composite increased with the increase of test load. The wear resistance advantage of composite was more obvious under higher test load. In addition, the relative wear resistance of composite under load of 30 N reached 3.7 times that of medium Cr steel. During the wear process, the protective effects of the enhanced region on the substrate region and the support effects of the substrate region to the enhanced regions were the main reason to endow the composite with excellent wear resistance by their synergistic effect. Moreover, the main wear mechanisms of composite were micro-plowing and fatigue fracture induced by plastic deformation.
作者
侯书增
鲍崇高
韩建东
付鸽
HOU Shu-zeng;BAO Chong-gao;HAN Jian-dong;FU Ge(College of Mechanical Engineering, Sichuan Univesity of Science & Engineering, Zigong 643000, China;State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an 710049, China)
出处
《材料保护》
CAS
CSCD
北大核心
2019年第4期20-25,共6页
Materials Protection
基金
自贡市重点科技计划项目(2017XC21)
汽车高性能材料及成形技术省高校重点实验室项目(szjj2015-092)
四川理工学院人才引进项目(2015RC05)资助
关键词
金属基复合材料
磨损
界面
钢结硬质合金
中珞钢
metal matrix composite
wear
interface
steel bonded carbide
medium Cr steel
