Effects of circular beam oscillation technique on formability and solidification behaviour of selective laser melted Inconel 718:From single tracks to cuboid samples  

作　　者：Huihui Yang Guanyi Jing Piao Gao Zemin Wang Xiangyou Li 

机构地区：[1]Wuhan National Laboratory for Optoelectronics,Huazhong University of Science and Technology,Wuhan,430074,China

出　　处：《Journal of Materials Science & Technology》2020年第16期137-150,共14页材料科学技术（英文版）

基　　金：financially supported by the Pre-research Fund Project of Ministry of Equipment and Development of China though Program(No.61409230301);the Fundamental Research Funds for the Central Universities through Program(Nos.2019kfy XMPY005 and 2019kfy XKJC042)。

摘　　要：The inherent drawbacks of selective laser melting technique including serious micro-pore and element microsegregation problems destroy the mechanical property of the component.To overcome this problem,a new approach,circular beam oscillation,was successfully applied in the SLMed Inconel 718 samples including single tracks,thin walls and cuboid samples.On one hand,circular beam oscillation reduces the micro-pores in molten pools and cuboid samples,increasing the relative density of the cuboid sample to 99.95%.On the other hand,circular beam oscillation suppresses the element microsegregation,reducing the formation of Laves phases in SLMed Inconel 718 samples.Moreover,circular beam oscillation enhances the<001>texture of thin walls and the<101>texture of cuboid samples.The improvement of formability and microstructure of the SLMed samples with oscillation is closely related to cooling rate,thermal gradient and stirring effect during the solidification process.Therefore,circular beam oscillation shows the possibility to overcome the key bottlenecks of the traditional SLM technology and to realize a further industrial application of SLM technology.

关 键 词：Circular beam oscillation Selective laser melting Inconel 718 Solidification behaviour 

分 类 号：TG665[金属学及工艺—金属切削加工及机床]