激光表面重熔CoCrFeMnNi高熵合金组织及耐蚀性能研究  

Study on Structure and Corrosion Resistance Properties of CoCrFeMnNi High-Entropy Alloy by Laser Surface Remelting

作　　者：陈景润 李珂 王逸飞 陆彦地 许波 张艳[1] 张静[1] CHEN Jing-run;LI Ke;WANG Yi-fei;LU Yan-di;XU Bo;ZHANG Yan;ZHANG Jing(Metallurgy and Materials Engineering,Jiangsu University of Science and Technology,Zhangjiagang 215600,Jiangsu,China;Suzhou Institute of Technology,Jiangsu University of Science and Technology,Zhangjiagang 215600,Jiangsu,China)

机构地区：[1]江苏科技大学冶金与材料工程学院,江苏张家港215600 [2]江苏科技大学苏州理工学院,江苏张家港215600

出　　处：《铸造》2023年第10期1244-1249,共6页Foundry

摘　　要：采用不同激光输出功率对CoCrFeMnNi高熵合金进行表面重熔处理,研究激光功率参数对合金相结构、显微组织硬度、耐磨性能以及耐腐蚀性能的影响规律。研究结果表明,经过激光重熔后合金表面明显出现重熔区、热影响区以及基体三部分,随着激光功率的提高,重熔区的深度明显增大。CoCrFeMnNi高熵合金在不同功率激光处理后,其相结构均为FCC相,未发生相变。激光表面重熔处理后,由于细晶强化和溶质截留效果提高了重熔层的硬度和耐磨性能,其中1000W重熔层的平均摩擦系数和磨损量最小,分别为0.099和1.27×10^(-3)mm^(3),耐磨性能最好。电化学腐蚀结果表明,CoCrFeMnNi高熵合金耐腐蚀性能不随激光功率的增加单一变化,激光输出功率为1000W时,重熔层的自腐蚀电位、自腐蚀电流密度分为-280mV、1.69μA/cm^(-2),耐腐蚀性能最好。The surface remelting treatment of CoCrFeMnNi high-entropy alloy was carried out by using different laser output powers to study the influence of laser power parameters on the phase structure,microstructure and corrosion resistance of the alloy.The results showed that the remelting zone,heat-affected zone and matrix parts appeared on the surface of the alloy after laser remelting,and the depth of the remelting zone increased significantly with the increase of laser power.The phase structure of CoCrFeMnNi high-entropy alloy was FCC phase without phase transformation after laser treatment with different power.The laser surface remelting treatment improved the hardness and wear resistance of the remelted layer due to the effect of fine grain strengthening and solute retention.The average friction coefficient and wear amount of the 1000 W remelted layer were the smallest,0.099 and 1.27×10^(-3)mm^(3),respectively,with the best wear resistance.The electrochemical corrosion results show that the corrosion resistance of CoCrFeMnNi high-entropy alloy does not change with the single increase of laser power,and the self-corrosion potential and self-corrosion current density of the remelted layer are divided into-280 mV and 1.69μA/cm^(-2) when the laser output power is 1000 W,with the best corrosion resistance ability.

关 键 词：高熵合金 激光重熔 显微组织 耐腐蚀性能 

分 类 号：TG178[金属学及工艺—金属表面处理]