湖南大学学报（自然科学版）2024，Vol.51Issue(4)：132-139,8.DOI:10.16339/j.cnki.hdxbzkb.2024179
基于金刚石热历史的超硬磨具激光增材制造工艺与组织性能优化
Optimization of Laser Additive Manufacturing Process and Microstructure Properties for Superhard Tools Based on Diamond Thermal History
摘要
Abstract
In the laser additive manufacturing process of superhard tools,diamonds are highly susceptible to the direct irradiation of laser beams and the influence of high-temperature melt pools,leading to phenomena such as graphitization and other thermal damage.A typical metal bonding agent CuSn10 powder for diamond abrasives is selected,and the Powder Bed Fusion-laser Beam(PBF-LB)technology is used to prepare CuSn10-diamond composites in this study.Focusing on two key factors affecting the performance of diamond particles in the manufacturing process,high-energy laser beams and high-temperature melt pools,individual diamond particles are selected as the research subject.A finite element simulation analysis is conducted to construct a temperature field model of diamond particles,reflecting the thermal evolution process of diamond particles in PBF-LB.The study elucidates the thermal damage mechanism of diamonds during the PBF-LB process,revealing that the graphitization transformation of diamonds is not caused by direct laser irradiation but is induced by the thermal effects of high-temperature melt pools.The critical temperature for graphitization of CuSn10-diamond composite material in the PBF-LB process is 1 491.6 ℃.Furthermore,a quantitative relationship is established among the PBF-LB process-diamond particle temperature-degree of graphitization-frictional wear performance,demonstrating that with the increase of diamond particle temperature,the degree of graphitization increases,seriously damaging the friction and wear performance of the composite material.关键词
激光增材制造/超硬磨具/金刚石/热演化/石墨化Key words
laser additive manufacturing/superhard tools/diamonds/thermal evolution/graphitization分类
化学化工引用本文复制引用
张伟,高远,马青原,彭英博,武玺旺,蓝阳,陈宇轩,陈治强..基于金刚石热历史的超硬磨具激光增材制造工艺与组织性能优化[J].湖南大学学报（自然科学版）,2024,51(4):132-139,8.基金项目
国家重点研发计划资助项目(2021YFB3701800),National Key Research and Development Program of China(2021YFB3701800) （2021YFB3701800）
国家自然科学基金区域创新发展联合基金项目(U20A20236),Joint Funds of the National Natural Science Foundation of China(U20A20236) （U20A20236）
湖南省自然科学基金资助项目(2020JJ4738),Natural Science Foundation of Hunan Province(2020JJ4738) （2020JJ4738）
