About this Abstract |
Meeting |
2022 TMS Annual Meeting & Exhibition
|
Symposium
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Additive Manufacturing: Materials Design and Alloy Development IV: Rapid Development
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Presentation Title |
NOW ON-DEMAND ONLY - J-25: Can Hot Cracking in LPBF Steel be Mitigated by Controlling the Powder Recoating Speed? |
Author(s) |
Tan-Phuc Le, Qingyang Lu, Shubo Gao, Jay Carroll, Matteo Seita |
On-Site Speaker (Planned) |
Tan-Phuc Le |
Abstract Scope |
Stainless steel 316L is known for its low susceptibility to hot cracking during laser powder bed fusion (LPBF) processes. In this work, however, we observe a clear increase in hot cracking when using a fast powder recoating velocity of 250 mm/s, with a consequent decrease in the alloy ductility. To investigate the origin of this phenomenon, we carry out a series of LPBF experiments using identical process parameters but different recoating velocities. We analyze both the powder layer using our proprietary technology as well as the microstructure of the solid samples produced using standard characterization techniques. Our results show that there are two dominant factors contributing to hot cracking—namely the powder layer thickness and the thermal buildup—both of which depend on the powder recoating velocity. This work may be useful for maximizing printing efficiency by decreasing part production time without exacerbating part performance. |
Proceedings Inclusion? |
Planned: |
Keywords |
Additive Manufacturing, Mechanical Properties, Solidification |