粉末冶金技术2025，Vol.43Issue(4)：415-422,8.DOI:10.19591/j.cnki.cn11-1974/tf.2025030018
基于微观结构调控增强激光粉末床熔融CoCrNi中熵合金耐蚀性能
Enhancing corrosion resistance of laser powder bed fusion CoCrNi medium-entropy alloys by microstructure regulation
摘要
Abstract
To resolve the issue of local dislocation enrichment in the non-equilibrium solidification of CoCrNi medium-entropy alloys,the microstructures of laser powder bed fusion CoCrNi medium-entropy alloys under different heat treatments were investigated by electron back scattering diffraction and transmission electron microscopy,and the interrelationships between microstructure,corrosion behavior,and passivation film characteristics were investigated by electrochemical experiments and X-ray photoelectron spectroscopy analysis.The results show that the additive manufactured CoCrNi medium-entropy alloys have the distinct columnar crystal structure and dislocation cellular structure.As the heat treatment temperature increases from 900℃to 1200℃,the dislocation cellular structure gradually disappears,and the recrystallization gradually occurs.The rapidly solidified columnar crystals transform into the equiaxial crystals during additive manufacturing,the grain size decreases,and the precipitated phases gradually coarser.After heat treatment at 900℃,the corrosion potential is the highest,the passivation current density and corrosion current density are the smallest,and the corrosion resistance performance is the best.As the heat treatment temperature rises to 1050～1200℃,the corrosion resistance decreases.关键词
中熵合金/耐蚀性能/激光粉末床熔融/电化学测试/位错胞Key words
medium entropy alloys/corrosion resistance/laser powder bed melting/electrochemical testing/dislocation cells分类
矿业与冶金引用本文复制引用
丁瑶,王力,刘海龙,赵卫国..基于微观结构调控增强激光粉末床熔融CoCrNi中熵合金耐蚀性能[J].粉末冶金技术,2025,43(4):415-422,8.基金项目
国家自然科学基金资助项目(52404410) （52404410）
中国科协青年人才托举计划 （）
陕西省自然科学基础研究计划项目(2024JC-YBQN-0367) （2024JC-YBQN-0367）
陕西省教育厅科学研究计划项目一般专项项目(24JK0515) （24JK0515）
