Detail publikace

Microstructural instability of L-PBF Co-28Cr-6Mo alloy at elevated temperatures

ROUDNICKÁ, M. MOLNÁROVÁ, O. DRAHOKOUPIL, J. ŠREIBR, V. PALOUŠEK, D. VOJTĚCH, D.

Originální název

Microstructural instability of L-PBF Co-28Cr-6Mo alloy at elevated temperatures

Typ

článek v časopise ve Web of Science, Jimp

Jazyk

angličtina

Originální abstrakt

In relation to the production of complex aircraft components, the additive manufacturing (AM) of Co-28Cr-6Mo alloy is highly discussed as it could bring many benefits regarding new designs, components lightening and shortening the design-to-product period. However, such components must undergo strict requirements for mechanical properties and material stability, even at elevated temperatures which might occur during part operation. So far, little is known about the thermal stability of Co-28Cr-6Mo alloy when produced by laser powder bed fusion (L-PBF), one of the mostly used AM technologies. In the present study, we reveal the instability of this material already at temperatures above 673 K. Material hardening accompanied with a significant loss of plasticity is caused by the breakdown of fine cellular microstructure with intercellular Mo segregation, precipitation of sigma-phase and phase transformation of the matrix. Detail characterization by transmission electron microscopy was carried out for the maximum hardness state obtained after annealing the alloy at 1173 K for 5 h. The important findings of this study, representing an operational risk for L-PBF Co-28Cr-6Mo alloy, call for subsequent research into suitable heat treatment that would induce the stability of the material.

Klíčová slova

Co-28Cr-6Mo; Additive manufacturing; Laser powder bed fusion; Elevated temperature operation

Autoři

ROUDNICKÁ, M.; MOLNÁROVÁ, O.; DRAHOKOUPIL, J.; ŠREIBR, V.; PALOUŠEK, D.; VOJTĚCH, D.

Vydáno

15. 5. 2021

Nakladatel

ELSEVIER

Místo

AMSTERDAM

ISSN

2214-7810

Periodikum

Additive Manufacturing

Ročník

44

Číslo

44

Stát

Nizozemsko

Strany od

1

Strany do

16

Strany počet

16

URL

http://www.sciencedirect.com/science/article/pii/S2214860421001901?via%3Dihub

BibTex

@article{BUT175115,
  author="Orsolya {Molnárová} and Jan {Drahokoupil} and Vít {Šreibr} and David {Paloušek} and Dalibor {Vojtěch} and Michaela {Roudnická}",
  title="Microstructural instability of L-PBF Co-28Cr-6Mo alloy at elevated temperatures",
  journal="Additive Manufacturing",
  year="2021",
  volume="44",
  number="44",
  pages="1--16",
  doi="10.1016/j.addma.2021.102025",
  issn="2214-7810",
  url="http://www.sciencedirect.com/science/article/pii/S2214860421001901?via%3Dihub"
}