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激光熔覆904L-Y203-Al2O3复合合金涂层

904L-Y203-Al2O3 Composite Alloy Coating Fabricated by Laser Cladding

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摘要

为了延长磷酸反应槽内搅拌桨叶片的服役寿命, 采用激光熔覆技术在904L不锈钢表面制备出Y203/Al2O3/904L复合涂层。采用X射线衍射仪、扫描电子显微镜、金相显微镜、显微硬度计及电化学工作站对涂层相结构、显微组织、硬度及耐蚀性进行检测。实验结果表明, 激光熔覆过程中大量的Al2O3在涂层表面聚集。复合涂层主要由单一的面心立方(FCC)相组成。复合涂层与基材良好冶金结合, 其组织由底部到顶部依次为平面晶→胞状晶→柱状树枝晶→等轴晶。复合涂层的硬度为250 HV左右, 与基材相比, 大约提高了35%。复合涂层的自腐蚀电位较基材更“正”, 自腐蚀电流密度较基材更小, 耐腐蚀性能良好。

Abstract

In order to prolong the service life of agitator blades inphosphoric acid reactors, the 904L-Y203-Al2O3composite alloy coating was fabricated by laser cladding on 904L stainless steel. The X-ray diffraction, scanning electron microscope, optical microscope, microhardness and electrochemical workstation were used to measure phase structure, microstructure, microhardness and corrosion resistance of coating. The experimental results show that an amount of aluminum oxide (Al2O3) couldn′t be dissolved into the coating. The coating is consisted of single face-centered-cubic (FCC) phase. Excellent metallurgical bonding between the coating and substrate is found.From the bottom to top of coating, the microstructure is plane crystal, dendritic crystal, columnar dendrite and equiaxed grain, successively. The hardness of composite coating is about 250 HV, 35% risen than that of substrate. The composite coating exhibits outstanding corrosion resistance with more “positive”self-corrosion potential and lower self-corrosion than that of substrate.

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中图分类号:TG174.4

基金项目:贵州省优秀青年科技人才培养资助项目(项目编号:黔科合人字(2015)04); 国家自然科学基金面上资助项目(项目编号:51671061); 贵州省高层次创新型人才培养资助项目(项目编号:黔科合人才(2015)4009号); 贵州省工业攻关资助项目(项目编号:黔科合GZ字(2015)3022号); 贵州省科技计划资助项目(项目编号:黔科合基础(2016)1024)

收稿日期:2017-05-08

修改稿日期:2017-07-17

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田兴强:贵州交通职业技术学院, 贵州 贵阳 550025
郭亚雄:贵州大学材料与冶金学院, 贵州 贵阳 550025
汪震:贵州交通职业技术学院, 贵州 贵阳 550025
陈佳:贵州大学材料与冶金学院, 贵州 贵阳 550025

联系人作者:田兴强(lbz741120@126.com)

备注:田兴强(1973-), 男, 大学本科, 教授。

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引用该论文

Tian Xingqiang,Guo Yaxiong,Wang Zheng,Chen Jia. 904L-Y203-Al2O3 Composite Alloy Coating Fabricated by Laser Cladding[J]. APPLIED LASER, 2017, 37(5): 644-648

田兴强,郭亚雄,汪震,陈佳. 激光熔覆904L-Y203-Al2O3复合合金涂层[J]. 应用激光, 2017, 37(5): 644-648

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