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侯书增,鲍崇高,付鸽.CTCP/NiCrBSi局域化增强耐热钢基复合材料的界面及其高温磨损性能[J].稀有金属材料与工程(英文),2019,48(7):2364~2370.[Hou Shuzeng,Bao Chonggao and Fu Ge.Interface Characteristics and High Temperature Wear Properties of Refractory Steel Matrix Composite Reinforced by Zoning CTCP/NiCrBSi[J].Rare Metal Materials and Engineering,2019,48(7):2364~2370.]
Interface Characteristics and High Temperature Wear Properties of Refractory Steel Matrix Composite Reinforced by Zoning CTCP/NiCrBSi
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Received:January 27, 2018  Revised:April 01, 2018
Key words: metal-matrix composite  high-temperature wear  zoning reinforcement  cast tungsten carbide
Foundation item:自贡市重点科技计划项目(2017XC21);四川理工学院人才引进项目(2015RC05);西华大学汽车高性能材料及成形技术省高校重点实验室项目(szjj2015-092)
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Hou Shuzeng,Bao Chonggao and Fu Ge  
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      Using surface-modified cast tungsten carbide particles (CTCP) as reinforcement, NiCrBSi alloy as binder phase and refractory steel as substrate, refractory steel matrix composite reinforced by zoning CTCP/NiCrBSi was prepared by vacuum fusion sintering. Composite interface was observed and formation mechanism of composite interface was analyzed. Wear behaviors of the composite in the range of 25~800℃ were studied. Wear mechanisms of the composite were also discussed. The results showed that, theSstructure is compact and the CTCP are evenly distributed in CTCP/NiCrBSi area of composite; the interface between CTCP/NiCrBSi area and refractory steel substrate is composed of three parts: CTCP dissolution zone, γ-Ni isothermal-solidification zone and element spread influence zone rich in (Fe,Cr)-B; within the test temperature range, the wear rate of composite is less than that of refractory steel and both the wear rate and the relative wear resistance of the composite show the trend of decreasing and then increasing with the increase of the test temperature; the relative wear resistance of composite at 800℃ is the highest, reaching 1.8 times that of refractory steel; in the range of 25~600℃, the wear mechanisms of the composite are mainly micro-plowing, fatigue fracture induced by undergoing plastic deformation, CTCP surface fatigue fracture caused by abrasive rolling and scratching, CTCP broken or shedding due to insufficient NiCrBSi support; in the range of 600~800℃, the wear mechanism of composite are mainly micro-plowing and mutual promotion of oxidation and wear.