| Microstructure and wear resistance of PTA clad Cr7C3/γ-Fe ceramal composite coating |
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| 作者姓名： | LIU Junbo WANG Limei HUANG Jihua |
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| 作者单位： | 1. Weifang University, Weifang 261061, China; 2. School of Materials Science and Engineering, University of Science and Technology, Beijing 100083, China |
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| 摘 要： | A wear resistant Cr7C3/γ-Fe ceramal composite coating was fabricated on substrate of the hardening and tempering C degree steel by PTA (plasma transferred arc) cladding with (wt%) Fe-25Cr-7C elemental powder blends. Microstructure of the coating was characterized by OM, SEM, XRD and EDS. Wear resistance of the coating was tested under dry sliding wear condition at room temperature. The results indicate that the PTA clad ceramal composite coating has a rapidly solidified fine microstructure consisting of Cr7C3 primary particles uniformly distributed in the γ-Fe matrix and is metallurgically bonded to the C degree steel substrate. The PTA clad Cr7C3/γ-Fe ceramal composite coating has high hardness and excellent wear resistance under dry sliding wear test conditions. The excellent wear resistance of the Cr7C3/γ-Fe ceramal composite coating is attributed to the coating’s high hardness, strong covalent atomic bonding and refined microstructure.
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| 关 键 词： | PTA clad Cr7C3/γ-Fe composite coating microstructure wear resistance. |
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