激光选区熔化成形参数对GH3625合金表面粗糙度的影响
Effect of Selective Laser Melting Forming Parameters on Surface Roughness of GH3625 Alloy
杜东方 1吴代建 1张光明 1李京筱 1胡雅清1
作者信息
- 1. 四川工程职业技术大学四川省冲压发动机先进制造技术工程实验室,四川德阳 618000
- 折叠
摘要
采用单因素实验法,对不同激光选区熔化(SLM)成形工艺参数的GH3625试件进行粗糙度检测、表面三维形貌观测、SEM形貌分析和致密度测试.结果表明,在实验范围内,随着激光功率、扫描速度、扫描间距、扫描层数的增加,上表面粗糙度值先减少后增大;随着曝光次数增加,熔道与熔道交叉熔合增多,上表面粗糙度值增加,但曝光次数对表面粗糙度值影响不明显;扫描次数增加重熔增加,重熔有利于表面凸起与低凹趋于一致,但重熔次数过多会出现表面反复加热,粗糙度值增高;在激光功率168 W、扫描速度600 mm/s、扫描间距0.09 mm、扫描层数2、曝光次数2的条件下进行SLM成形时,GH3625合金获得了最低的上表面粗糙度2.11μm,在该状态下,合金的显微组织呈现柱状晶和类六边形的胞状晶结构,成品致密度达到98.6％.
Abstract
In this study,the single-factor experiment was used to detect the roughness,observe the three-dimensional surface morphology,SEM morphology and density of GH3625 specimen with different selective laser melting(SLM)forming process parameters.The results show that within the experimental range,the upper surface roughness initially decreases and then in-creases with increasing laser power,scanning speed,scanning spacing,and scanning layers.Increased exposure times enhance cross-fusion between fused regions,slightly raising the surface roughness.Remelting,facilitated by higher scanning times,promotes the convergence of convex and concave surfaces,yet excessive remelting leads to repeated surface heating and elevated roughness.Optimum conditions of 168 W laser power,600 mm/s scanning speed,0.09 mm scanning distance,2 scanning lay-ers,and 2 exposure times yield a minimum upper surface roughness of 2.11 μm for GH3625 alloy,accompanied by a columnar and hexagon-like cellular microstructure and a final product density of 98.6％.
关键词
激光选区熔化/GH3625/成形参数/上表面/粗糙度Key words
selective laser melting/GH3625/forming parameters/upper surface/roughness引用本文复制引用
基金项目
四川省科技计划重点研发项目(2023YFG0168)
德阳市重点科技计划项目(2022GZ012)
四川工程职业技术大学校级项目(XJ2024KJ-01)
出版年
2024
NETL
NSTL
万方数据