引用本文:崔祥鹏a，刘其斌a,b.45钢激光合金化铬钼硼的显微组织及抗蚀性能[J].中国表面工程,2011,24(2):57~60
CUI Xiang–penga, LIU Qi–binb.Microstructure and Corrosion Resistance of Laser Alloying on 45 Steel with Chromium, Molybdenum and Boron[J].China Surface Engineering,2011,24(2):57~60
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45钢激光合金化铬钼硼的显微组织及抗蚀性能
崔祥鹏a，刘其斌a,b
贵州大学 a. 蔡家关校区材料学院 b. 贵州省材料结构与强度重点实验室，贵阳 550003
摘要:
为改善45钢制件表面耐腐蚀性，采用CO2激光在45钢表面合金化铬钼硼以获得高耐蚀性的合金复合涂层。采用X射线衍射仪、金相显微镜、SEM和多功能微机电化学分析仪对合金化层的显微组织及性能进行了研究。结果表明，合金元素与基材实现了良好的冶金结合。合金层组织主要是胞状晶，在晶粒和晶界上弥散分布着通过原位结合形成的高硬度碳化物。合金层的相成分为Fe–Cr、FeB2、CrB2、MoC、Fe3(C,Mo)及Fe3C等；在合金化层内部硬度最高为860 HV，比基材提高了将近3倍，合金化层在盐酸中的抗腐蚀性能也显著提高。
关键词:  激光合金化  合金化层  显微硬度  抗腐蚀性
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基金项目:贵州省科技厅工业攻关项目（黔科合GY字[2008]3029）;贵阳市科技局“产学研”专项[2008]筑科I合同字第24-14
Microstructure and Corrosion Resistance of Laser Alloying on 45 Steel with Chromium, Molybdenum and Boron
CUI Xiang–penga, LIU Qi–binb
a. College of Materials and Metallurgy b. Guizhou Key Laboratory for Microstructure and Strength of Materials, Guizhou University, Guiyang 550003
Abstract:
To improve the corrosion resistance of 45 steel pieces, Chromium, molybdenum and boron were alloyed on 45 steel by CO2 laser to obtain excellent corrosion resistance composite coating. Microstructure and properties of alloying coating were studied by means of XRD, OM, SEM and multi–purpose microcomputer electrochemistry analyzer. The experimental results indicate that excellent metallurgical bonding is obtained between alloying layer and substrate. The microstructure of alloying layer is principally cell crystal. The different high hardness carbides formed by the in–situ are distributed in grain interior and grain boundary. The phases of alloying layer include Fe–Cr、FeB2、CrB2、MoC、Fe3(C, Mo) and Fe3C. The highest micro–hardness of alloying layer is 860 HV, which is nearly three times than that of substrate; the corrosion resistance of alloying layer is improved obviously in the hydrochloric acid.
Key words:  laser alloying  alloying layer  micro–hardness  corrosion resistance
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