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激光熔敷Cr₃Si/Cr₂Ni₃Si复合材料涂层组织与耐磨性研究

MICROSTRUCTURE AND WEAR RESISTANCE OF LASER CLAD Cr₃Si/ Cr₂ Ni₃Si COMPOSITE COATING

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【Author】 DUAN Gang1,ZHAO Hai- yun1,2 ,WANG Hua- ming1,2 (1.L aboratory of L aser Materials Processing and Surface Engineering,School of Materials Science and Engineering, Beijing University of Aeronautics and Astronautics,Beijing 10 0 0 83,China; 2 .State Key L

【机构】北京航空航天大学材料学院激光材料加工与表面工程实验室；北京航空航天大学材料学院激光材料加工与表面工程实验室北京100083；北京100083华中科技大学激光技术国家重点实验室；武汉430074；北京100083华中科技大学激?；

【摘要】以 Cr- Si- Ni合金粉末为原料、利用激光熔敷技术在 A 3低碳钢表面上制得了以金属硅化物 Cr3Si为增强相 ,以 Cr2 Ni3Si复杂金属硅化物为基体的快速凝固 Cr3Si/ Cr2 Ni3Si复合材料冶金涂层 ,分析了该涂层的显微组织 ,并分别在干滑动磨损及二体磨料磨损条件下测试了该涂层的耐磨性能。研究结果表明 ,由于激光熔敷 Cr3Si/Cr2 Ni3Si快速凝固复合材料涂层组织细小、均匀 ,在滑动磨损过程中不易与对偶件粘着、在磨料磨损过程中具有很高的抗切削抗剥落能力 ,因而在干滑动磨损及二体磨料磨损条件下涂层均具有优良的耐磨性能更多还原

【Abstract】 A novel rapidly solidified Cr3Si /Cr2 Ni3Sicomposite coating is fabricated on the substrate of a0 .2 0 % C low carbon steel by laser cladding using Cr- Si- Ni elemental powder blends.The laser clad coating has a homogeneous microstructure consisting of Cr3Si primary dendrites uniformly dis- tributed in the Cr2 Ni3Si complex silicide matrix and is metallurgically bonded to the substrate.The laser clad Cr3Si reinforced Cr2 Ni3Si silicide matrix composite coating has good wear resistance under dry sliding wear testcondition and pin- on- disk abrasive wear testcondition.更多还原