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| 激光熔覆镍基合金层的组织与高温耐磨性能 | |
| 引用本文： | 路程,刘江文,马文有,陈和兴.激光熔覆镍基合金层的组织与高温耐磨性能[J].材料保护,2012,45(2):1-4,84. |
| 作者姓名： | 路程 刘江文 马文有 陈和兴 |
| 作者单位： | 1. 华南理工大学材料科学与工程学院,广东广州510640／广州有色金属研究院,广东广州510650 2. 华南理工大学材料科学与工程学院,广东广州,510640 3. 广州有色金属研究院,广东广州,510650 |
| 基金项目： | 广东省教育部产学研结合项目(2010A090200077) |
| 摘 要： | 为了改善304不锈钢工件的高温耐磨性能,利用CO2激光器在其表面熔覆了Ni基高温合金层。研究了熔覆层的物相组成、显微组织、成分分布,测试了其显微硬度、高温耐磨性能等,并与基材进行了对比。结果表明:Ni基合金熔覆层的组织从熔池底部到表层为胞状晶—柱状枝晶—树枝晶;熔覆层的主要组成相是Ni3Cr2,NbC,Mo2C与Cr23C6;Ni基合金粉末中添加难熔元素Cr,Mo,Nb等对熔覆层的组织起到了固溶强化、硬质相强化和弥散强化作用;熔覆层的平均显微硬度达到了405 HV,高温耐磨性能是基体的2倍多。 |
| 关 键 词： | 激光熔覆 Ni基合金层 难熔元素 显微组织 高温耐磨性能 |
Microstructure and High-Temperature Wear Resistance of Laser Cladding Nickel-Based Alloy Coating |
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| LU Cheng,LIU Jiang-wen,MA Wen-you,CHEN He-xing.Microstructure and High-Temperature Wear Resistance of Laser Cladding Nickel-Based Alloy Coating[J].Journal of Materials Protection,2012,45(2):1-4,84. | |
| Authors: | LU Cheng LIU Jiang-wen MA Wen-you CHEN He-xing |
| Affiliation: | 1. School of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, China;2. Guangzhou Research Institute of Non-Ferrous Metals, Guangzhou 510650, China) |
| Abstract: | Ni-based alloy cladding coating was prepared on 304 stainless steel substrate using a CO2 laser. The phase structure, microstructure and composition distribution of the laser cladding coating were investigated, and its microhardness and high-temperature wear resistance were examined. It was found that as-prepared Ni-based alloy coating consisted of cellular crystalline, columnar dendrite and fine dendrite from the bottom of the molten cell to the surface. Ni3Cr2 , NbC, Mo2C and Cr23C6 were identified in the laser cladding layer. Besides, introducing refractory element Cr, Mo and Nb into the laser cladding materials resulted in solid solution strengthening, hard phase strengthening and dispersion strengthening. As-prepared Ni-based alloy coating possessed an average microhardness of 405 HV, and its wear resistance was two times better than that of the stainless steel substrate. |
| Keywords: | laser cladding Ni-based alloy coating refractory element microstructure high-temperature wear resistance |
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