Quasi In-Situ Study of Microstructure in a Laser Powder Bed Fusion Martensitic Stainless Steel
Ayda Shahriari (University of New Brunswick)
Mehdi Sanjari (Natural Resources Canada, University of New Brunswick)
Mahdi Mahmoudiniya (Universiteit Gent)
Hadi Pirgazi (Universiteit Gent)
Babak Shalchi Amirkhiz (University of New Brunswick, Natural Resources Canada)
Leo A.I. Kestens (TU Delft - Team Maria Santofimia Navarro, Universiteit Gent)
Mohsen Mohammadi (University of New Brunswick)
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Abstract
This study explores the evolution of solidification microstructure of a laser powder bed fusion (L-PBF) martensitic stainless steel during solution annealing and aging. Quasi in-situ experiments using electron backscatter diffraction (EBSD) revealed that the finer, more equiaxed microstructure below the melt pool was susceptible to recrystallization and grain growth during solution annealing. The two distinct solidification microstructures below and inside the melt pool converged into a uniform grain morphology after solution annealing and aging processes. Graphical Abstract: (Figure presented.)