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Technique Reduces Residual Warpage in Laser Powder Bed Fusion

Nov 7, 2022, 02:00 AM by User Not Found

In laser powder bed fusion (LPBF) for the additive manufacture of metal parts, local high-temperature molten metal fits the surrounding solid part as a result of thermal expansion. As a negative byproduct of this process, the molten metal generates a negative thermal stress following solidification, which produces an in-plane residual stress.

This residual stress accumulates toward the upper layer with the repetitive formation process on each layer and often leads to undesirable effects such as delamination, cracking, and warpage.

Moreover, residual warpage and deformation are asymmetric in nature and scale with the size of the fabricated metal part. As a result, the integrated molding of large metal parts, such as rocket...
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