%0 Journal Article %T 激光功率对激光熔覆FeCoNiCr高熵合金涂层组织结构及腐蚀性能的影响* %T Effects of Laser Power on Microstructure and Corrosion Property of Laser Cladding FeCoNiCr High Entropy Alloy Coatings %A 马清,张艳梅,卢冰文,王岳亮,闫星辰,马汝成,刘敏 %A MA,Qing %A ZHANG,Yanmei %A LU,Bingwen %A WANG,Yueliang %A YAN,Xingchen %A MA,Rucheng %A LIU,Min %J 中国表面工程 %J CHINA SURFACE ENGINEERING %@ 1007-9289 %V 35 %N 1 %D 2022 %P 116-124 %K 高熵合金;激光熔覆;激光功率;择优取向;耐蚀性能 %K high entropy alloy; laser cladding; laser power; preferred orientation; corrosion resistance %X 针对激光熔覆高熵合金涂层的成分设计已有较多探究,但激光工艺参数对涂层结构与性能的影响尚缺乏系统研究。采用激光熔覆技术在 316L 不锈钢基体表面制备 FeCoNiCr 高熵合金涂层,系统探究激光功率(1.2 ~2.0 kW)对 FeCoNiCr 高熵合金涂层的组织结构以及耐腐蚀性能的影响规律。不同激光功率制备的 FeCoNiCr 涂层均由典型的单一面心立方结构(FCC) 组成,但随着激光功率的增大,涂层逐渐出现择优取向。FeCoNiCr 涂层呈现典型的双层组织结构特征,底部为柱状晶,顶部为等轴晶,但随着激光功率增加,顶部等轴晶逐渐向柱状晶转变。随着激光功率的增加,FeCoNiCr 涂层混合熵值逐渐下降。 FeCoNiCr 涂层具有优异的耐腐蚀性能,但随激光功率的增加而逐渐减弱。其中,当功率为 1.2 kW 时,涂层的自腐蚀电流密度最小,自腐蚀电压最大且涂层表面无腐蚀坑,具有最佳的耐腐蚀性能,优于 316L 基体以及 Stellite6 和 Ni60 等常规激光熔覆涂层。通过优化激光功率获得具有良好耐腐蚀性能的激光熔覆 FeCoNiCr 高熵合金涂层,可对该类涂层的开发、制备和应用提供一定的理论指导和技术支持。 %X The design of composition of high entropy alloy coatings fabricated by laser cladding has been explored by many scholars, but the influence of laser processing parameters on the structure and porpersity of the coating is still lack of systematic analysis. FeCoNiCr high entropy alloy coatings are fabricated on the surface of 316L stainless steel by laser cladding. The effects of laser power (1.2~2.0 kW) on the microstructure and corrosion resistance of FeCoNiCr coatings are investigated systematically. FeCoNiCr coatings fabricated with different laser powers have a typical single face centered cubic (FCC) structure, but with the increase of laser power, the coatings gradually show preferred orientation. FeCoNiCr coating presents typical double-layer structure, with columnar crystal at the bottom and equiaxed crystal at the top. However, with the increase of laser power, the equiaxed crystal at the top gradually changes to columnar crystal. Also, with the increase of laser power, the mixing entropy of FeCoNiCr coatings decreases gradually. The corrosion resistance of FeCoNiCr coating is good, but it gradually weakens with the increase of laser power. When the laser power is 1.2 kW, the self-corrosion current density of the coating reaches the lowest point and the self-corrosion voltage obtains its highest value. Moreover, there are no corrosion pits on the coating surface indicating that it has the best corrosion resistance, which is better than 316L stainless steel substrate and conventional laser cladding coatings such as Stellite6 and Ni60. The laser cladding of FeCoNiCr high entropy alloy coatings with good corrosion resistance is obtained by optimizing the laser power, which provides some theoretical guidance and technical supports for the development, preparation and application of this type of coatings. %R 10.11933/j.issn.1007-9289.20210908002 %U http://www.csejournal.com/zgbmgc/ch/reader/view_abstract.aspx %1 JIS Version 3.0.0