EFFECT OF POWDER LAYER THICKNESS ON RESIDUAL STRESS IN LASER POWDER BED FUSION OF IN718

Elham Mirkoohi, Hong Chuong Tran, Yu Lung Lo, You Cheng Chang, Hung You Lin, Steven Y. Liang

研究成果: Conference contribution

摘要

Understanding the relationships between the processing factors in laser powder bed fusion (L-PBF) and residual stress formation is critical for improving the final part performance since tensile residual stress has a critical impact on fatigue life performance and final material properties of the manufactured part. Laser powder bed fusion has virtually infinite number of processing factors each can impact the residual stress, among which, layer thickness is one of them. This paper investigates the impact of powder layer thickness on residual stress formation for the Ni-based super-alloy Inconel 718 (IN718). Test coupons with different layer thicknesses are fabricated with the same geometry. Residual stress is determined via X-ray diffraction (XRD) at different locations along the build direction and transverse direction. In addition, the previously developed physics-based analytical model is used to draw a relationship between powder layer thickness and residual stress through the prediction of temperature field and thermal stress using incremental plasticity. The results of computational modeling and experiments are in good agreement and shows that the increase in powder layer thickness increases the residual stress in an additively manufactured part.

原文English
主出版物標題Additive Manufacturing; Biomanufacturing; Life Cycle Engineering; Manufacturing Equipment and Automation; Nano/Micro/Meso Manufacturing
發行者American Society of Mechanical Engineers
ISBN(電子)9780791885802
DOIs
出版狀態Published - 2022
事件ASME 2022 17th International Manufacturing Science and Engineering Conference, MSEC 2022 - West Lafayette, United States
持續時間: 2022 6月 272022 7月 1

出版系列

名字Proceedings of ASME 2022 17th International Manufacturing Science and Engineering Conference, MSEC 2022
1

Conference

ConferenceASME 2022 17th International Manufacturing Science and Engineering Conference, MSEC 2022
國家/地區United States
城市West Lafayette
期間22-06-2722-07-01

All Science Journal Classification (ASJC) codes

  • 工業與製造工程

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