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,2019,48(7):2364~2370.[Hou Shuzeng,Bao Chonggao,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.]
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
投稿时间:2018-01-27  修订日期:2018-04-01
中文关键词:  金属基复合材料  高温磨损  局域化增强  铸造碳化钨
基金项目: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)
中文摘要:
      以表面改性的铸造碳化钨颗粒(CTCP)为增强体,以NiCrBSi合金为粘结相,以耐热钢为基板采用真空熔烧工艺制备了一种CTCP/NiCrBSi局域化增强耐热钢基复合材料。观察分析了复合材料的界面特征及其形成机理,研究了复合材料在25~800℃下的磨损性能,并讨论了复合材料的磨损机理。结果表明,复合材料增强区域组织致密、CTCP分布均匀,增强区域与耐热钢基板之间的界面由CTCP分解区,γ-Ni等温凝固区和富含(Fe,Cr)-B的扩散影响区三个部分构成;在试验温度范围内,复合材料的磨损率都小于耐热钢的磨损率,复合材料的磨损率和相对耐磨性都随着试验温度的升高呈现先减小后增加的趋势,800℃时复合材料的相对耐磨性最高,达到耐热钢的1.8倍;在25~600℃时,复合材料的磨损机理主要是微观切削、塑变疲劳断裂、CTCP表面由磨料碾压刮擦导致的疲劳剥落和CTCP因NiCrBSi支撑不足导致的折断或脱落,在600~800℃时,复合材料的磨损机理主要是微观切削和氧化与磨损的交互作用。
Interface Characteristics and High Temperature Wear Properties of Refractory Steel Matrix Composite Reinforced by Zoning CTCP/NiCrBSi
英文关键词:metal-matrix composite  high-temperature wear  zoning reinforcement  cast tungsten carbide
英文摘要:
      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.
作者单位E-mail
侯书增 四川理工学院 机械工程学院 houshuzeng2009@126.com 
鲍崇高 西安交通大学 金属强度国家重点实验室  
付鸽 四川理工学院 机械工程学院  
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