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Tempering of an additively manufactured microsegregated hot-work tool steel: A high-temperature synchrotron X-ray diffraction study

Fonseca, E. B.; Escobar, J. D.; Gabriel, A. H. G.; Ribamar, G. G.; Boll, T. ORCID iD icon 1,2; Lopes, É. S. N.
1 Institut für Angewandte Materialien – Werkstoffkunde (IAM-WK), Karlsruher Institut für Technologie (KIT)
2 Karlsruhe Nano Micro Facility (KNMF), Karlsruher Institut für Technologie (KIT)

Abstract:

Rapidly solidified microstructures, produced by concentrated heat sources, have gained increasing attention due to the widespread expansion of additive manufacturing techniques. In laser powder bed fusion of tool steels, the as-built microstructure consists of a microsegregated network of cell-like walls decorated with retained austenite (RA). This inhomogeneous elemental distribution leads to phase transformation sequences dictated by local – instead of global – equilibrium. This work uses synchrotron X-ray diffraction to study the kinetics of retained austenite decomposition during tempering of a microsegregated as-built AISI H13 tool steel. The RA decomposition products are also characterized by hardness tests, scanning electron microscopy, and atom probe tomography. Present results evidence the formation of high temperature para-equilibrium (T < 650 °C) or equilibrium (T ≥ 650 °C) microstructures. The para-equilibrium microstructural path evidences isothermally stable RA, which transforms into fresh martensite upon cooling due to carbon depletion. However, the cell-like microsegregation arrangement is retained due to insufficient homogenization of substitutional elements. ... mehr


Postprint §
DOI: 10.5445/IR/1000146048
Veröffentlicht am 07.04.2023
Originalveröffentlichung
DOI: 10.1016/j.addma.2022.102812
Scopus
Zitationen: 8
Web of Science
Zitationen: 7
Dimensions
Zitationen: 8
Cover der Publikation
Zugehörige Institution(en) am KIT Karlsruhe Nano Micro Facility (KNMF)
Institut für Angewandte Materialien – Werkstoffkunde (IAM-WK)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 07.2022
Sprache Englisch
Identifikator ISSN: 2214-8604, 2214-7810
KITopen-ID: 1000146048
HGF-Programm 38.04.01 (POF IV, LK 01) Gas turbines
Weitere HGF-Programme 43.35.03 (POF IV, LK 02) Structural and Functional Behavior of Solid State Systems
Erschienen in Additive Manufacturing
Verlag Elsevier
Band 55
Seiten Art.Nr. 102812
Vorab online veröffentlicht am 06.04.2022
Schlagwörter KNMFi 2020-023-028310 APT FIB
Nachgewiesen in Scopus
Web of Science
Dimensions
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