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Solidification pathway induced microstructural differences in austenitic stainless steels produced by L-PBF
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DOI：10.1080/21663831.2025.2536044.png)
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Abstract
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This study examines the influence of small compositional variations on the microstructure of 304L stainless steel produced by Laser Powder Bed Fusion (L-PBF). Despite identical processing parameters, N-atomized powder forms textured, columnar grains with elemental segregation, solidifying primarily as γ-austenite with secondary ferrite. In contrast, Ar-atomized powder produces equiaxed grains with uniform composition, following a primary ferrite to secondary γ-austenite mode. Operando synchrotron X-ray diffraction during L-PBF reveals that solidification mode critically shapes the final microstructure, underscoring the importance of solidification control for tailoring properties in austenitic stainless steels.
Keywords:
Laser powder bed fusion
Solidification mode
crystallographic texture
stainless steel
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