摘要
为明确激光能量密度作为选区激光熔化工艺优化依据的可靠性,以钴铬合金为对象,通过数值模拟与试验验证,考察了相同能量密度下不同扫描速度时成形试样的温度场、熔池尺寸和致密度。结果表明,激光能量密度不是影响选区激光成形过程中熔池尺寸和致密度的可靠参数,在相同激光能量密度下,激光扫描速度不同,会影响粉床上粉末的熔化和凝固过程及形成的熔池尺寸。激光能量密度相同时,随着激光扫描速度增大,熔池尺寸增加,试样致密度也相应提高。
To clarify the reliability of laser energy density as the basis for optimizing selected laser melting process,temperature field,melt pool size,and densification of selected laser melted specimens at different scan speeds with constant energy density were investigated through numerical simulation and experiments using cobaltchromium alloy powder.The results show that the laser energy density is not a reliable parameter that affects the melt pool size and relative density of selected laser melted parts.In addition,the scanning speed of laser plays a crucial role in modulating the melting and solidification processes of the powder and melt pool size.When the laser energy density is the same,as the laser scanning speed increases,the melt pool size increases,and the density of the sample increases accordingly.
作者
黎振华
邓煜华
姚碧波
滕宝仁
李颢
Li Zhenhua;Deng Yuhua;Yao Bibo;Teng Baoren;Li Hao(School of Materials Science&Engineering,Kunming University of Science and Technology,Kunming,Yunnan 650093,China;School of Mechanical and Electrical Engineering,Kunming University of Science and Technology,Kunming,Yunnan 650500,China)
出处
《激光与光电子学进展》
CSCD
北大核心
2022年第7期403-407,共5页
Laser & Optoelectronics Progress
基金
国家自然科学基金(51961017)
云南省基础研究重点项目(202101AS070017)
云南省重点研发计划(2018BA064)。
