Analysis of cyclic phase transformations during additive manufacturing of hardenable tool steel by in-situ X-ray diffraction experiments

SCRIPTA MATERIALIA

卷:177

Article

Epp, Jeremy^1,2  Dong, Juan¹  Meyer, Heiner¹  Bohlen, Annika³ 

[1] Leibniz Inst Mat Engn IWT Bremen, Badgasteiner Str 3, D-28359 Bremen, Germany

[2] Univ Bremen, MAPEX Ctr Mat & Proc, Bibliothekstr 1, D-28359 Bremen, Germany

[3] BIAS Bremer Inst Angew Strahltech GmbH, Klagenfurter Str 5, D-28359 Bremen, Germany

关键词: Additive manufacturing;    Laser metal deposition;    In-situ X-ray diffraction;    Tool steel;    Self-tempering;   

DOI  :  10.1016/j.scriptamat.2019.09.021

来源: Elsevier

【 摘 要 】

In-situ X-ray diffraction experiments were performed during Laser Metal Deposition of steel X40CrMoV5-1 at the Deutsches Elektronen-Synchrotron (DESY). The measurements were performed with monochromatic high-energy X-ray radiation in transmission, while full diffraction rings were recorded at 10 Hz. The first generated layer is remelted until deposition of the third layer on top, while partial re-austenitizing of the first layer occurs until deposition of the 7th layer. Self-tempering effects were analyzed based on martensite tetragonality. Strong decrease of carbon content in solution in martensite occurs during the deposition of the first five layers, resulting in low local hardness. (C) 2019 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

【 授权许可】

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