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| 激光功率对激光熔覆NiCoCrAlY涂层组织及性能的影响 |
| Effects of Laser Power on Microstructure and Properties of Laser Cladding NiCoCrAlY Coating |
| Received:June 22, 2021 |
| DOI：10.3969/j.issn.1674-6457.2022.03.007 |
| 中文关键词: 激光熔覆 NiCoCrAlY涂层 硬度 耐腐蚀性能 摩擦磨损性能 |
| 英文关键词: laser cladding NiCoCrAlY coating hardness corrosion resistance friction and wear properties |
| 基金项目:国家自然科学基金山西煤基低碳联合基金(U1810112) |
| Author Name | Affiliation | | LIU Si-yuan | School of Materials Science and Engineering, North University of China, Taiyuan 030051, China | | LI Yu-xin | School of Materials Science and Engineering, North University of China, Taiyuan 030051, China | | YANG Yi-xin | School of Materials Science and Engineering, North University of China, Taiyuan 030051, China | | CHEN Bo-wen | School of Materials Science and Engineering, North University of China, Taiyuan 030051, China |
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| 中文摘要: |
| 目的 为了提高17-4PH的耐腐蚀性能和摩擦磨损性能，采用激光熔覆技术在17-4PH不锈钢表面制备NiCoCrAlY涂层。方法 利用X射线衍射(XRD)、扫描电镜(SEM)、显微维氏硬度计、电化学工作站和往复摩擦磨损试验机等研究不同激光功率下NiCoCrAlY涂层的相组成、微观形貌、硬度、耐腐蚀性能和摩擦磨损性能。结果 NiCoCrAlY涂层中包含γ/γ'相和β相，随着激光功率的增大，未完全熔融的NiCoCrAlY粉末颗粒、夹渣和孔隙等缺陷逐渐减少，直至消失。当激光功率为2000 W时，NiCoCrAlY涂层的组织均匀致密，无夹渣和气孔等缺陷。NiCoCrAlY涂层的硬度、耐腐蚀性能及摩擦磨损性能均高于基体。当激光功率为2000 W时，NiCoCrAlY涂层硬度(490HV0.1)最高，摩擦磨损性能(摩擦因数为0.57)和耐腐蚀性能最优。结论 最优的激光功率为2000 W，此工艺参数下制备的NiCoCrAlY涂层有效提高了17-4PH不锈钢的硬度、耐腐蚀性能及摩擦磨损性能。 |
| 英文摘要: |
| The work aims to prepare NiCoCrAlY coating on the surface of 17-4PH stainless steel by laser cladding technology, so as to improve the corrosion resistance and friction and wear properties of 17-4PH. Phase composition, microstructure, hardness, corrosion resistance and friction and wear properties of the NiCoCrAlY coating prepared with different laser powers were studied by means of X-ray diffraction (XRD), scanning electron microscopy (SEM), Vickers hardness tester, electrochemical workstation and reciprocating friction and wear tester. The microstructure of the NiCoCrAlY coating consisted of γ/γ' phase and β phase. With the increase of the laser power, the defects such as incomplete molten NiCoCrAlY powder particles, slag inclusions and pores gradually decreased and finally disappeared. When the laser power was 2000 W, the microstructure of the NiCoCrAlY coating was uniform and dense, without defects such as slag inclusion and porosity. The hardness, corrosion resistance and friction and wear properties of NiCoCrAlY coating were higher than those of the substrate. When the laser power was 2000 W, NiCoCrAlY coating had the highest hardness (490HV0.1), friction and wear properties (friction coefficient 0.57) and corrosion resistance were the best. The optimal laser power is 2000 W. The NiCoCrAlY coating prepared under this process parameter effectively improves the hardness, corrosion resistance and friction and wear properties of 17-4PH stainless steel. |
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