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Open AccessArticle

Crystallographic Features of Microstructure in Maraging Steel Fabricated by Selective Laser Melting

1
Department of Materials Process Engineering, Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan
2
Aichi Center for Industry and Science Technology, 1267-1 Akiai, Yakusa-cho, Toyota 470-0356, Japan
*
Author to whom correspondence should be addressed.
Metals 2018, 8(6), 440; https://doi.org/10.3390/met8060440
Received: 25 May 2018 / Revised: 7 June 2018 / Accepted: 8 June 2018 / Published: 9 June 2018
(This article belongs to the Special Issue Additive Manufacturing of Ferrous Materials)
This study characterizes the microstructure and its associated crystallographic features of bulk maraging steels fabricated by selective laser melting (SLM) combined with a powder bed technique. The fabricated sample exhibited characteristic melt pools in which the regions had locally melted and rapidly solidified. A major part of these melt pools corresponded with the ferrite (α) matrix, which exhibited a lath martensite structure with a high density of dislocations. A number of fine retained austenite (γ) with a <001> orientation along the build direction was often localized around the melt pool boundaries. The orientation relationship of these fine γ grains with respect to the adjacent α grains in the martensite structure was (111)γ//(011)α and [-101]γ//[-1-11]α (Kurdjumov–Sachs orientation relationship). Using the obtained results, we inferred the microstructure development of maraging steels during the SLM process. The results depict that new and diverse high-strength materials can be used to develop industrial molds and dies. View Full-Text
Keywords: additive manufacturing; maraging steel; microstructure; martensite structure; orientation relationship; electron backscattering diffraction (EBSD) additive manufacturing; maraging steel; microstructure; martensite structure; orientation relationship; electron backscattering diffraction (EBSD)
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MDPI and ACS Style

Takata, N.; Nishida, R.; Suzuki, A.; Kobashi, M.; Kato, M. Crystallographic Features of Microstructure in Maraging Steel Fabricated by Selective Laser Melting. Metals 2018, 8, 440.

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