Fe-Cu激光熔覆涂层时效处理后的组织性能研究
Study on Microstructure and Property of Fe-Cu Laser Cladded Coating After Aging Treatment
李 旭1, 周 芳2
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作者单位：(1. 贵阳学院 机电系, 贵州 贵阳 550005; 2. 贵州大学 材料与冶金学院, 贵州 贵阳 550003)
中文关键字：激光熔覆； 时效； 组织结构； 耐磨性
英文关键字：laser cladding; aging; microstructure; wear resistance
中文摘要：采用光学显微镜、扫描电镜、X射线衍射、透射电镜以及滑动磨损实验机，研究了经时效处理后的Fe-Cu激光熔覆涂层的组织结构及耐磨性能。结果表明，Fe-Cu激光熔覆层组织由α-Fe(马氏体)和断续网状的M7C3和M23C6组成，在马氏体上分布着高密度的位错。熔覆层经550 ℃时效20 h和30 h后，从马氏体基体中析出富铬碳化物相，并且沿M7C3相由马氏体中析出弥散分布的ε-Cu颗粒，在ε-Cu颗粒附近分布有若干位错，对位错起钉扎作用。熔覆层在时效以后可获得较高的耐磨性能。
英文摘要：The microstructure and wear resistance of Fe-Cu laser cladded coating after aging treatment were investigated by OM, SEM, XRD, TEM and sliding wear tester. The results show that the microstructure of the Fe-Cu laser cladded coating consists of α-Fe (martensite), discontinuous reticulate M7C3 and M23C6. The TEM observation shows that the high density dislocation exists in martensite. The Cr-rich carbide and ε-Cu precipitate froms martensite when the cladded coatings were aged at 550 ℃ for 20 h or 30 h. Some dislocations distribute around ε-Cu. The dislocations are anchored by ε-Cu. The Fe-Cu laser cladded coating has excellent wear resistance after aging treatment.