樊宇,孙强,方荣超,等.AlCoCrCuFeNi高熵合金激光加工组织及性能研究[J].精密成形工程,2019,11(6):178-188.
FAN Yu,SUN Qiang,FANG Rong-chao,et al.Microstructure and Properties of AlCoCrCuFeNi High-Entropy Alloy Laser Processing[J].Journal of Netshape Forming Engineering,2019,11(6):178-188. |
| AlCoCrCuFeNi高熵合金激光加工组织及性能研究 |
| Microstructure and Properties of AlCoCrCuFeNi High-Entropy Alloy Laser Processing |
| 投稿时间：2019-10-15 修订日期：2019-11-10 |
| DOI：10.3969/j.issn.1674-6457.2019.06.026 |
| 中文关键词: 液压支架 表面处理 激光焊接 高熵合金 AlCoCrCuFeNi |
| 英文关键词: hydraulic support surface treatment laser welding high-entropy alloy AlCoCrCuFeNi |
| 基金项目:江苏省博士后科研资助计划（2018K010A）；中国博士后科学基金第64批面上资助（2018M642355）；江苏省“六大人才高峰” （GDZB-032）；江苏省科协青年科技人才托举工程资助培养项目；徐州市科技计划面上项目（KC18072） |
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| 中文摘要: |
| 目的 针对液压支架立柱表面处理提出了新一代“激光包覆焊”新思路，着重探讨高熵合金AlCoCrCuFeNi作为薄带材料的可行性。方法 采用真空熔炼的方法制备高熵合金AlCoCrCuFeNi的铸锭，用光纤激光器对AlCoCrCuFeNi高熵合金进行单道焊接和连续多道表面重熔。通过金相显微镜观察重熔层的表面形貌、X射线衍射仪进行物相分析、显微硬度计测定硬度，并进行摩擦磨损试验和腐蚀试验来研究重熔层的耐磨性和耐蚀性。结果 高熵合金AlCoCrCuFeNi铸态母材组织为等轴树枝晶，Cu在枝晶间区严重偏析，焊后晶粒更加细化，偏析现象也得到缓解，硬度上升了29.9%，铸态母材与焊缝的物相均为单一的FCC相；经激光重熔后，高熵合金AlCoCrCuFeNi形成了等轴、细小、均匀、致密的晶粒组织，激光重熔层最大硬度为HV669，重熔层摩擦因数和摩擦磨损量均小于铸态母材，激光重熔层和铸态母材均在氯化钠溶液中耐蚀性较强，在盐酸溶液中的耐蚀性较差。结论 高熵合金AlCoCrCuFeNi经激光重熔后，焊后晶粒更加细化，偏析现象也得到缓解，晶粒尺寸在5~8 μm左右。作为薄带的备选材料，高熵合金AlCoCrCuFeNi满足耐磨性高、耐蚀性高（激光重熔后略低于铸态母材）、可焊性好的3个基本要求。 |
| 英文摘要: |
| This paper aims to propose a new thought on a new generation of "laser packing welding" for surface treatment of hydraulic support columns, and emphatically discuss the feasibility of taking AlCoCrCuFeNi high-entropy alloy as thin strip material. The ingot of high-entropy alloy AlCoCrCuFeNi was prepared by vacuum melting. The single-pass welding and continuous multi-surface remelting of AlCoCrCuFeNi high-entropy alloy were carried out by fiber laser. The surface morphology of the remelted layer was observed by metallographic microscope; the phase analysis was performed by X-ray diffractometer; the hardness was measured by microhardness tester; and the friction and wear test and corrosion test were carried out to study the wear resistance and corrosion resistance of the remelted layer. The structure of as cast base metal of high-entropy alloy AlCoCrCuFeNi was equiaxed dendrite. Cu was seriously segregated in the dendrite area. The grain was more refined after welding; and the segregation phenomenon was alleviated. The hardness was increased by 29.9%. The phase of as cast base metal and weld was single FCC phase. After laser remelting, the equiaxed, fine, uniform and dense grain structure was formed in high-entropy alloy AlCoCrCuFeNi, and the laser remelted layer was formed. The maximum hardness of the laser remelted layer was HV669. Both the friction coefficient and friction wear amount of the remelted layer were smaller than that of the as cast base metal. Both the laser remelted layer and as cast base metal had high corrosion resistance in sodium chloride solution. After laser remelting, the grains of high-entropy alloy AlCoCrCuFeNi were more refined and the segregation phenomenon is alleviated. The grain size is about 5-8 μm. As an alternative material for thin strip, high-entropy alloy AlCoCrCuFeNi meets three basic requirements: high wear resistance, high corrosion resistance (slightly lower than as cast base metal after laser remelting) and good weldability. |
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