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Micro-Texture Analyses of a Cold-Work Tool Steel for Additive Manufacturing.


ABSTRACT: Small objects of an alloy tool steel were built by selective laser melting at different scan speeds, and their microstructures were analyzed using electron backscatter diffraction (EBSD). To present an explicit correlation with the local thermal cycles in the objects, prior austenite grains were reconstructed using the EBSD mapping data. Extensive growth of austenitic grains after solidification could be detected by the disagreement between the networks of carbides and austenite grain boundaries. A rapid laser scan at 2000 mm/s led to less growth, but retained a larger amount of austenite than a slow one at 50 mm/s. The rapid scan also exhibited definite evolution of Goss-type textures in austenite, which could be attributed to the growth of austenitic grains under a steep temperature gradient. The local variations in the microstructures and the textures enabled us to speculate the locally different thermal cycles determined by the different process conditions, that is, scan speeds.

SUBMITTER: Kang JY 

PROVIDER: S-EPMC7040591 | biostudies-literature | 2020 Feb

REPOSITORIES: biostudies-literature

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Micro-Texture Analyses of a Cold-Work Tool Steel for Additive Manufacturing.

Kang Jun-Yun JY   Yun Jaecheol J   Kim Byunghwan B   Choe Jungho J   Yang Sangsun S   Park Seong-Jun SJ   Yu Ji-Hun JH   Kim Yong-Jin YJ  

Materials (Basel, Switzerland) 20200209 3


Small objects of an alloy tool steel were built by selective laser melting at different scan speeds, and their microstructures were analyzed using electron backscatter diffraction (EBSD). To present an explicit correlation with the local thermal cycles in the objects, prior austenite grains were reconstructed using the EBSD mapping data. Extensive growth of austenitic grains after solidification could be detected by the disagreement between the networks of carbides and austenite grain boundaries  ...[more]

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