电焊机2024，Vol.54Issue(7)：12-19,8.DOI:10.7512/j.issn.1001-2303.2024.07.02
选区激光熔化制备CuCrZr合金致密化行为与组织性能调控研究
Study on Formation and Microstructural Properties of CuCrZr Alloys Prepared by Selective Laser Melting
摘要
Abstract
The CuCrZr alloy possesses excellent thermal and electrical conductivity,as well as good mechanical properties,making it an important material for aerospace,nuclear reactor components,and other fields.This study analyzes the forming performance of CuCrZr alloy prepared by selective laser melting(SLM),focusing on the effects of three main process pa-rameters—laser power,scanning speed,and scanning spacing—on the alloy's density,microstructure,and microhardness.The research indicates that the pores in SLM-formed CuCrZr alloys are primarily caused by incomplete powder melting and gas pores.As the volumetric energy density increases,the pore type gradually transitions from powder melting incomplete-ness to gas pores.The alloy exhibits higher density when the scanning spacing is 0.12 mm compared to 0.09 mm.The opti-mal process parameters are 360 W laser power,800 mm/s scanning speed,0.12 mm scanning spacing,and 0.03 mm layer thickness,achieving a density of 99.30%with a volumetric energy density of 125 J/mm3.The microstructure of the alloy fea-tures large grains surrounding smaller grains,with irregular and randomly distributed grain shapes,reflecting the anisotropy of grain growth caused by the non-uniform temperature field during SLM forming.The microstructure morphology differs significantly in different building directions,with equiaxed grains dominating on the XY plane,while the XZ plane shows a large number of columnar grains growing along the building direction.Additionally,the process parameters have a minimal impact on the microhardness value of SLM-formed CuCrZr alloys,with density exerting a more significant influence on hardness.Higher hardness values are observed in areas with finer or elongated grain aggregation.SLM technology can be utilized to fabricate high-performance CuCrZr alloys,and optimizing process parameters can result in high density,fine and uniform microstructure,and high hardness.关键词
选区激光熔化/CuCrZr合金/成形性能/显微组织/硬度Key words
SLM/CuCrZr alloy/forming performance/microstructures/hardness分类
矿业与冶金引用本文复制引用
宋峻岭,李怀学,范宏举,刘鹏..选区激光熔化制备CuCrZr合金致密化行为与组织性能调控研究[J].电焊机,2024,54(7):12-19,8.基金项目
国家重点研发计划项目(2023YFB4604903) （2023YFB4604903）
