超高速激光熔覆与常规激光熔覆431不锈钢涂层微观组织和耐蚀性的对比 
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Comparison of Microstructure and Corrosion Resistance of 431 Stainless Steel Coatings Prepared by Extreme High-Speed Laser Cladding and Conventional Laser Cladding
1 哈尔滨工业大学先进焊接与连接国家重点实验室, 黑龙江 哈尔滨 150001
2 亚琛联合科技(天津)有限公司, 天津 300457
图 & 表
图 1. 熔覆原理图。 (a)超高速激光熔覆过程原理;(b)常规激光熔覆过程原理
Fig. 1. Principles of two laser claddings. (a) EHLA; (b) CLA
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图 2. 单层不锈钢涂层截面的宏观形貌。(a)超高速激光熔覆;(b)常规激光熔覆
Fig. 2. Macroscopic morphologies of single-layer stainless steel coating prepared by two methods. (a) EHLA; (b) CLA
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图 3. 超高速和常规激光熔覆过程的熔池形态。(a)超高速激光熔覆;(b)常规激光熔覆
Fig. 3. Molten pool morphologies of EHLA and CLA. (a) EHLA; (b) CLA
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图 4. 超高速激光熔覆单层多道搭接涂层的形貌。(a)涂层整体形貌; (b)涂层表面(A区域)形貌;(c)涂层中部(B区域)形貌; (d)底部/基体界面结合区(C区域)形貌
Fig. 4. Morphologies of single-layer multi-lap coatings by EHLA. (a) Macroscopic morphology of coating; (b) micro-morphology of surface of coating (zone A); (c) micro-morphology of middle part of coating (zone B); (d) micro-morphology of coating/substrate interface (zone C)
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图 5. 常规激光熔覆单层多道搭接涂层的形貌。 (a) 涂层整体形貌; (b)涂层表面(A区域)形貌;(c)涂层中部(B区域)形貌; (d)底部/基体界面结合区(C区域)形貌
Fig. 5. Morphologies of single-layer multi-lap coatings by CLA. (a) Macroscopic morphology of coating; (b) micro-morphology of surface of coating (zone A); (c) micro-morphology of middle part of coating (zone B); (d) micro-morphology of coating/substrate interface (zone C)
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图 6. 超高速激光熔覆涂层与常规激光熔覆涂层的组织对比。(a)超高速激光熔覆涂层的顶部组织;(b)超高速激光熔覆涂层的截面组织;(c)常规激光熔覆涂层的顶部组织;(d)常规激光熔覆涂层的截面组织
Fig. 6. Comparison of microstructures of coatings prepared by EHLA and CLA. (a) Top microstructure of coating prepared by EHLA; (b) cross-sectional microstructure of coating prepared by EHLA; (c) top microstructure of coating prepared by CLA; (d) cross-sectional microstructure of coating prepared by CLA
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图 7. 涂层中的元素分布。(a)超高速激光熔覆涂层;(b)常规激光熔覆涂层
Fig. 7. Elemental distributions of coatings. (a) Coating prepared by EHLA; (b) coating prepared by CLA
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图 8. 涂层的硬度分布图
Fig. 8. Hardness distribution of coating
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图 9. 超高速激光熔覆突出和常规激光熔覆涂层表面的XRD分析
Fig. 9. XRD analyses for surfaces of coatings prepared by EHLA and CLA
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图 10. 超高速激光熔覆涂层、常规激光熔覆涂层和基体在3.5%NaCl溶液中的极化曲线
Fig. 10. Polarization curves of substrate and coatings prepared by EHLA and CLA in 3.5% NaCl solution
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图 11. 涂层枝晶的显微组织。(a)超高速激光熔覆涂层;(b)常规激光熔覆涂层
Fig. 11. Microstructures of dendrites in coatings. (a) Coating prepared by EHLA; (b) coating prepared by CLA
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表 127SiMn钢和431不锈钢粉末的化学成分(原子数分数,%)
Table1. Chemical composition of 27SiMn steel and 431 stainless steel powder (atomic number fraction, %)
| Material | C | Si | Mn | Cr | Fe | Ni |
|---|
| 27SiMn | 3.37 | 2.09 | 1.70 | 0.47 | 91.78 | 0.58 | | 431 powder | 0.02 | 1.76 | - | 19.12 | 75.63 | 1.96 |
|
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表 2涂层与基体的腐蚀电位、腐蚀电流密度
Table2. Corrosion potentials and current densities of substrate and coatings prepared by EHLA and CLA
| Sample | Corrosion potentialEcorr /V | Corrosion currentdensity Icorr /(μA·cm-2) |
|---|
| EHLA | -0.232 | 0.324 | | CLA | -0.5981 | 9.001 | | Substrate | -0.754 | 12.235 |
|
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表 3超高速激光熔覆涂层和常规激光熔覆涂层的枝晶内部和晶间成分差异
Table3. Difference in chemical composition inside and between dendrites for coatings prepared by EHLA and CLA
| Coating | Position | Atomic numberfraction of Cr /% |
|---|
| EHLA coating | a | 19.78 | | b | 20.17 | | CLA coating | c | 12.78 | | d | 15.19 |
|
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李俐群, 申发明, 周远东, 陶汪, 王威, 王树良. 超高速激光熔覆与常规激光熔覆431不锈钢涂层微观组织和耐蚀性的对比[J]. 中国激光, 2019, 46(10): 1002010. Liqun Li, Faming Shen, Yuandong Zhou, Wang Tao, Wei Wang, Shuliang Wang. Comparison of Microstructure and Corrosion Resistance of 431 Stainless Steel Coatings Prepared by Extreme High-Speed Laser Cladding and Conventional Laser Cladding[J]. Chinese Journal of Lasers, 2019, 46(10): 1002010.
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