引用本文:张国松,侯怀志,殷强浩,刘涛,王文超,玄纪元,崔洪芝.功率对激光熔覆(Fe0.25Co0.25Ni0.25Cr0.125Mo0.125)86B14涂层组织均质性及磨损性能的影响*[J].中国表面工程,2022,35(3):214~225
ZHANG Guosong,HOU Huaizhi,YIN Qianghao,LIU Tao,WANG Wenchao,XUAN Jiyuan,CUI Hongzhi.Effect of Power on Microstructure Homogeneity and Wear Performance of Laser Cladding (Fe0.25Co0.25Ni0.25Cr0.125Mo0.125)86B14 Coating[J].China Surface Engineering,2022,35(3):214~225
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功率对激光熔覆(Fe0.25Co0.25Ni0.25Cr0.125Mo0.125)86B14涂层组织均质性及磨损性能的影响*
张国松1,2, 侯怀志1, 殷强浩1, 刘涛1, 王文超1, 玄纪元1, 崔洪芝1
1.山东科技大学机械电子工程学院 青岛 266590;2.山东能源重型装备制造集团有限责任公司 泰安 271025
摘要:
目前激光熔覆缺少对涂层组织、相结构纵向均质性与性能关联的研究。采用激光熔覆技术，选取不同的激光功率，制备(Fe0.25Co0.25Ni0.25Cr0.125Mo0.125)86B14 高熵合金涂层；借助电子探针(EPMA)、扫描电子显微镜(SEM)、能谱仪(EDS)和 X 射线衍射仪(XRD)等观察涂层微观组织与物相纵向分布，利用显微硬度计和摩擦磨损试验机测试涂层不同深度部位显微硬度及磨损性能，分析激光功率对熔覆(Fe0.25Co0.25Ni0.25Cr0.125Mo0.125)86B14 涂层纵向组织、物相分布影响规律及磨损性能。结果表明：三种功率下，涂层均由 BCC+FCC 相、硬质相 Mo2B 组成，Mo2B 在枝晶间富集。随着功率的增加，涂层中底部显微组织由细枝晶向粗大的柱状晶转变。三种涂层硬度均由表及里先增加后降低，摩擦因数先降低后增加；但是当激光功率为 1.6 kW 时，涂层呈现以 BCC 相为主的 FCC+BCC 双相结构，且由表及里 BCC 相含量不断增加、Mo2B 含量逐渐减少，涂层组织均质化最高，摩擦因数变化梯度最小，耐磨损性能最佳。激光功率会影响熔覆高熵合金耐磨涂层均质性，进而影响摩擦性能的稳定性。
关键词:  激光熔覆  功率  (Fe0.25Co0.25Ni0.25Cr0.125Mo0.125)86B14合金  均质性  磨损
DOI：10.11933/j.issn.1007-9289.20211123004
分类号:TG174
基金项目:国家自然科学基金(51971121)；山东省重大科技创新工程(2019JZZY010303，2019JZZY010360)；山东省博士后创新(202103054)；青岛西海岸新区科技计划专项(202090)资助项目
Effect of Power on Microstructure Homogeneity and Wear Performance of Laser Cladding (Fe0.25Co0.25Ni0.25Cr0.125Mo0.125)86B14 Coating
ZHANG Guosong1,2, HOU Huaizhi1, YIN Qianghao1, LIU Tao1, WANG Wenchao1, XUAN Jiyuan1, CUI Hongzhi1
1.School of Mechanical and Electronic Engineering, Shandong University of Science and Technology,Qingdao 266590 , China;2.Shandong Energy Heavy Equipment Manufacturing Group Company with Limited Liability,Taian 271025 , China
Abstract:
At present laser cladding lacks research on the correlation between the coating structure, longitudinal homogeneity of phase structure and properties. Laser cladding technology is used to prepare (Fe0.25Co0.25Ni0.25Cr0.125Mo0.125)86B14 high-entropy alloy coatings with different laser powers. The microstructure and longitudinal distribution of the coating are observed by means of electron probe (EPMA), scanning electron microscope (SEM), energy dispersive spectrometer (EDS) and X-ray diffractometer (XRD). The microhardness and wear properties of the coating at different depths are tested by machine, and the influence of laser power on the longitudinal microstructure, phase distribution and wear properties of the cladding (Fe0.25Co0.25Ni0.25Cr0.125Mo0.125)86B14 coating is analyzed. The results show that under the three powers, the coatings are composed of BCC+FCC phase and hard phase Mo2B, and Mo2B is enriched between dendrites. With the increase of power, the microstructure at the bottom of the coating changes from fine dendrites to coarse columnar crystals. The hardness of the three coatings increases first and then decreases from the outside to the inside, and the friction coefficient first decreases and then increases; however, when the laser power is 1.6 kW, the coating presents a FCC+BCC dual-phase structure dominated by BCC phase, and the content of BCC phase increases from the surface to the inside, and the content of Mo2B gradually decreases. The homogenization of the coating structure is the highest, the gradient of friction coefficient change is the smallest, and the wear resistance is the best. Laser power affects the homogeneity of wear-resistant coating of cladding high entropy alloy, and then affects the stability of friction properties.
Key words:  laser cladding  power  (Fe0.25Co0.25Ni0.25Cr0.125Mo0.125)86B14 alloy  homogeneity  wear
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