摘要
选区激光熔化(SLM)Inconel 625成型件各向异性缺乏相关研究与评估,为研究其在不同打印角度下的各向异性及力学性能,以镍基高温合金粉末Inconel 625为原料,采用SLM技术制备0°、45°和90°3类不同打印角度的试件,通过准静态拉伸试验和数字散斑图像技术(DIC),获得Inconel 625材料的应力应变数据及全场应变分布。结果表明:0°角打印在3类成型方式中力学性能最优,打印角度的选择对激光成型Inconel 625抗伸强度、应力应变分布影响较大;对比DIC全场应变云图与强度分布曲线发现应力集中带分布与打印角度一致,SLM制备成型件时选取0°角打印、减少分层数可有效降低各向异性的影响并提升力学性能;最后,通过扫描电镜对试样的断口形貌进行观察和分析,发现0°角试件断口处存在大量小尺寸韧窝,分层处未出现层间断裂,45°、90°角试件断口多位于分层结合处;准静态拉伸Inconel 625成型件断裂模式为韧性断裂。通过DIC技术可以精确研究SLM成型件应变分布,为今后降低和预防增材制造各向异性提供了参考。
The anisotropy of selected laser melting(SLM)Inconel 625 forming parts lacks relevant research and evaluation.In order to study the anisotropy and mechanical properties of its formed parts at different printing angles,the tensile specimens of 0°,45°and 90°were prepared with nickel-base superalloy powder Inconel 625 as raw material by SLM technology.Through uniaxial tensile test and digital image technology(DIC),the stress-strain curves of specimens were obtained,and the strain field changes of specimens with three printing angles were analyzed.The results show that the yield strength of Inconel 625 is different at different printing angles,and the mechanical properties of the specimen printed at 0°Angle are the best.The stress concentration band of DIC nephogram is consistent with the printing Angle,and DIC technology can accurately measure the difference of the double-line relationship and anisotropy.And the fracture morphology of the specimens was observed and analyzed by scanning electron microscopy.It was found that the 0°specimens were closely bonded with each other,and the 45°and 90°specimens were located at the layered joints.The fracture mode of Inconel 625 specimen was ductile fracture.The strain distribution of SLM forming parts can be accurately studied by DIC technology,which provides a reference for reducing and preventing the anisotropy of additive manufacturing in the future.
作者
杨来侠
杜康
徐超
高伟
李素丽
YANG Laixia;DU Kang;XU Chao;GAO Wei;LI Suli(College of Mechanical and Engineering,Xi’an University of Science and Technology,Xi’an 710054,China;State Key Laboratory for Mechanical Manufacturing Systems Engineering,Xi’an Jiaotong University,Xi’an 710049,China)
出处
《西安科技大学学报》
CAS
北大核心
2023年第4期761-768,共8页
Journal of Xi’an University of Science and Technology
基金
国家重点实验室开放课题研究基金项目(SKLMS2021016)
2022年度服务地方专项科研计划项目(22JC053)。
关键词
选区激光熔化
镍基高温合金
数字散斑图像
打印角度
各向异性
selective laser melting
mickel-based superalloy
digital image correlation(DIC)
pringting angle
anisotropy
