Journal Article

PUBDB-2025-01831

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png A Combined Experimental and Numerical Assessment of the Role of Microsegregation and Phase Formation on Hot Cracking Susceptibility in Laser Powder Bed Fusion Processed CM247LC

Stich, P. ; Apel, M. ; Megahed, M. ; Bautmans, L. ; Barriobero Vila, P.Extern* ; Hans, M.Extern* ; Weirich, T. ; Büßenschütt, K. (Corresponding author) ; Schleifenbaum, J. H. ; Haase, C.

2025
Elsevier Rio de Janeiro

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Please use a persistent id in citations: doi:10.1016/j.jmrt.2025.06.040  doi:10.3204/PUBDB-2025-01831

Abstract: For many high-performance alloys originally developed for the casting route, hot cracking is aserious problem in the Laser Powder Bed Fusion (PBF-LB/M) process and limits the use ofe.g. high-' nickel-based alloys such as CM247LC in additive manufacturing. In this work, weinvestigate the relationship between PBF-LB/M processing parameters and the solidificationpath, i.e. phase formation and microsegregation, and its potential impact on hot cracking forthe high-' alloy CM247LC. We combined experimental microstructural analysis usingscanning and transmission electron microscopy, atom probe tomography and diffractiontechniques with multiphase-field simulations on μm scale. Process simulations at mesoscaleof the melt pool provide the link between the process conditions and the thermal boundaryconditions for the microstructural simulations. The study confirms the appearance of carbides,borides and '-precipitates in the as-solidified microstructure. The quantity and particle size ofthese phases as observed in the experimental samples, are in qualitative agreement with thesimulation results. Therefore, the simulations can be used to elucidate and quantify thedifferences in the solidification path for different thermal process conditions. Although thecomparison of samples processed with high energy density (cooling rate 65,000 K/s) with thoseprocessed with low energy density (cooling rate: 570,000 K/s) show large differences in thecrack density observed in the experiments, the microstructural differences and the phaseformation at the dendritic scale do not show any remarkable qualitative or quantitativedifferences. The correlation between processing conditions, microstructure evolution and crackformation is critically discussed and differences to the current understanding presented inexisting literature are identified.

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Contributing Institute(s):

1. DOOR-User (DOOR ; HAS-User)
2. Helmholtz-Zentrum Hereon (Hereon)

Research Program(s):

1. 6G3 - PETRA III (DESY) (POF4-6G3) (POF4-6G3)
2. DFG project G:(GEPRIS)523879740 - Analyse der Wechselwirkungen zwischen wasserstoffbasierten Verbrennungssystemen, Hochtemperaturmaterialien und laserbasierter Additiver Fertigung (H2MAT3D) (523879740) (523879740)
3. DFG project G:(GEPRIS)409476157 - SFB 1394: Strukturelle und chemische atomare Komplexität – Von Defekt-Phasendiagrammen zu Materialeigenschaften (409476157) (409476157)
4. BMBF 13N15423 - Verbundprojekt: Forschungscampus Digital Photonic Production Open-Know-how-Pool (DPP-Open) - Teilvorhaben: Grundlagenforschung für den Know-how-Pool und Erarbeitung von innovativen Kooperationsstrukturen (13N15423) (13N15423)

Experiment(s):

1. PETRA Beamline P07 (PETRA III)

Appears in the scientific report 2025

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Database coverage:
; ; ; ; Article Processing Charges ; Clarivate Analytics Master Journal List ; Current Contents - Engineering, Computing and Technology ; Current Contents - Physical, Chemical and Earth Sciences ; DOAJ Seal ; Essential Science Indicators ; Fees ; IF >= 5 ; JCR ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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