High-Resolution Microstructure Characterization of Additively Manufactured X5CrNiCuNb17-4 Maraging Steel during Ex and In Situ Thermal Treatment

Mihaela Albu*, B. Panzirsch, Hartmuth Schröttner, Stefan Mitsche, Klaus Reichmann, Maria Cecilia Poletti, Gerald Kothleitner

*Korrespondierende/r Autor/-in für diese Arbeit

Publikation: Beitrag in einer FachzeitschriftArtikelBegutachtung

Abstract

Powder and selective laser melting (SLM) additively manufactured parts of X5CrNiCuNb17-
4 maraging steel were systematically investigated by electron microscopy to understand the relationship
between the properties of the powder grains and the microstructure of the printed parts. We
prove that satellites, irregularities and superficial oxidation of powder particles can be transformed
into an advantage through the formation of nanoscale (AlMnSiTiCr) oxides in the matrix during the
printing process. The nano-oxides showed extensive stability in terms of size, spherical morphology,
chemical composition and crystallographic disorder upon in situ heating in the scanning transmission
electron microscope up to 950 C. Their presence thus indicates a potential for oxide-dispersive
strengthening of this steel, which may be beneficial for creep resistance at elevated temperatures. The
nucleation of copper clusters and their evolution into nanoparticles, and the precipitation of Ni and
Cr particles upon in situ heating, have been systematically documented as well.
Originalspracheenglisch
Aufsatznummer7784
Seitenumfang16
FachzeitschriftMaterials
Jahrgang14
Ausgabenummer24
DOIs
PublikationsstatusVeröffentlicht - 1 Dez. 2021

ASJC Scopus subject areas

  • Allgemeine Materialwissenschaften
  • Physik der kondensierten Materie

Fields of Expertise

  • Advanced Materials Science

Treatment code (Nähere Zuordnung)

  • Basic - Fundamental (Grundlagenforschung)

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