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Interface Characteristics and High Temperature Wear Properties of Refractory Steel Matrix Composite Reinforced by Zoning CTCP/NiCrBSi
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1.College of Mechanical Engineering,Sichuan University of Science Engineering;2.State Key Laboratory for Mechanical Behavior of Materials,Xi’an Jiaotong University,Xi′an

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    Abstract:

    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.

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[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.]
DOI:10.12442/j. issn.1002-185X.20180104

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History
  • Received:January 27,2018
  • Revised:April 01,2018
  • Adopted:April 26,2018
  • Online: August 01,2019
  • Published: