【摘要】 目的 为了提高GH5188高速激光熔覆涂层的摩擦磨损性能和耐腐蚀性能，采用超声滚压（UR）技术在GH5188涂层表面制备纳米晶层。方法 利用扫描电子显微镜（SEM）、X射线衍射仪（XRD）、能谱分析仪（EDS）、维氏硬度计、高温摩擦磨损试验机和电化学工作站研究超声滚压作用下GH5188涂层的微观形貌、相组成、显微硬度、高温摩擦磨损性能和耐腐蚀性能。结果 超声滚压后，GH5188涂层表面达到镜面效果，与未滚压相比，粗糙度下降58%；制备出厚度为18μm的纳米晶层；与H13基体相比，未滚压的涂层表面显微硬度提高21%，超声滚压后的涂层表面显微硬度提高70%；与H13基体相比，未滚压的涂层耐磨性提高69%，超声滚压后的涂层耐磨性提高81%；电化学测试结果表明，与H13基体相比，未滚压的涂层耐腐蚀性提高12%，超声滚压后的涂层耐腐蚀性提高17%。结论 超声滚压后的涂层表层组织位错密度和晶界增加，获得了纳米晶层，有效改善了GH5188涂层的显微硬度、耐磨性和耐腐蚀性等力学性能。更多还原

【Abstract】 The work aims to prepare nanocrystalline layer on the surface of GH5188 coating by ultrasonic rolling(UR)technique, so as to improve the friction and wear properties and corrosion resistance of GH5188 high-speed laser cladding coating. The microstructure, phase composition, microhardness, high-temperature friction and wear properties, and corrosion resistance of GH5188 coating under UR were investigated by scanning electron microscope(SEM), X-ray diffractometer(XRD),energy spectrum analyzer(EDS), Vickers hardness tester, high-temperature friction and wear tester and electrochemical workstation. After UR, the GH5188 coating surface achieved a mirror-like effect, with roughness decreasing by 58% compared with the coating not rolled. Nanocrystalline layer with a thickness of 18 μm was prepared. Compared with the H13 substrate, the microhardness of the coating surface not rolled increased by 21% and the microhardness of the coating surface after UR increased by 70%. Compared with the H13 substrate, the wear resistance of the coating not rolled increased by 69% and the wear resistance of the coating after UR increased by 81%. From the electrochemical test results, compared with the H13 substrate, the corrosion resistance of the coating not rolled increased by 12% and the corrosion resistance of the coating after UR increased by 17%. Therefore, the microstructure dislocation density and grain boundary of the coating surface after UR increase and the nanocrystalline layer is obtained, which effectively improves the mechanical properties of GH5188 coating such as microhardness, wear resistance and corrosion resistance.更多还原