粉末冶金技术2025，Vol.43Issue(4)：444-452,9.DOI:10.19591/j.cnki.cn11-1974/tf.2025030025
Cr元素改性对激光选区熔化铜镍合金微观组织及耐蚀性能的影响
Effect of Cr on microstructure and corrosion resistance of copper-nickel alloys fabricated by selective laser melting
摘要
Abstract
To enhance the mechanical properties and corrosion resistance of the copper-nickel alloys,the mechanical alloying was employed to introduce Cr powders with the mass fraction of 0%～3%into CuNi30 matrix powders,and the CuNi30-xCr copper-nickel bulk alloys(x is mass fraction,x=0,1%,2%,3%)were fabricated by selective laser melting technology with the relative densities exceeding 98%.The influences of Cr mass fraction on the microstructure,mechanical properties,and corrosion resistance of the copper-nickel bulk alloys were systematically investigated by optical microscopy,X-ray diffraction,scanning electron microscopy,energy dispersive spectroscopy,and electrochemical workstation analysis.The optimization mechanism of Cr on the mechanical properties and the regulatory mechanism on the corrosion behavior of the alloys were elucidated.In the results,a small amount of Cr can solidify into the α-Cu phases during the laser melting process,and increasing the Cr content can promote the precipitation of Cr-rich phases.The addition of Cr elements improves the mechanical properties and corrosion resistance of the copper-nickel alloys with the microhardness increasing from HV0.2 126 to HV0.2 157 as the Cr content increases.When the Cr content is 3%,the corrosion potential of the alloys shifts positively from-0.238 V(CuNi30)to-0.210 V(reference electrode is saturated calomel electrode),and the corrosion current density decreases from 1.38×10-6 A·cm-2 to 7.72×10-7 A·cm-2,showing the reduction of 44%,due to the solid solution strengthening of Cr and the formation of Cr-rich second phases,inhibiting the matrix anodic dissolution tendency.关键词
激光选区熔化/铜镍合金/铬含量/微观组织/耐蚀性/显微硬度Key words
selective laser melting/copper-nickel alloys/chromium content/microstructure/corrosion resistance/microhardness分类
矿业与冶金引用本文复制引用
高世阳,贺星,张咪娜,陈海达,周述东,王以珅,丁洁..Cr元素改性对激光选区熔化铜镍合金微观组织及耐蚀性能的影响[J].粉末冶金技术,2025,43(4):444-452,9.基金项目
宁波市"科创甬江2035"重点研发计划资助项目(2025Z075) （2025Z075）
中国科学院宁波材料技术与工程研究所基金资助项目(CAS2022SZKY0312) （CAS2022SZKY0312）
江苏省高等学校重点学科建设项目(PAPD) （PAPD）
