Detail publikace
Heat treatment of laser powder-bed-fused Co-28Cr-6Mo alloy to remove its microstructural instability by massive FCC -> HCP transformation
ROUDNICKÁ, M. KUBÁSEK, J. PANTĚLEJEV, L. MOLNÁROVÁ, O. BIGAS, J. DRAHOKOUPIL, J. PALOUŠEK, D. VOJTĚCH, D.
Anglický název
Heat treatment of laser powder-bed-fused Co-28Cr-6Mo alloy to remove its microstructural instability by massive FCC -> HCP transformation
Typ
článek v časopise ve Web of Science, Jimp
Jazyk
en
Originální abstrakt
Laser powder bed fusion (L-PBF) of Co-28Cr-6Mo alloy is a powerful tool for many engineering applications but one has to be familiar with its microstructural instability in the as-produced state. In our previous study [Roudnicka et al., Additive Manuf. 44 (2021) 102025], we depicted the phenomenon of this instability when exposing the material to temperatures above 673 K. Microstructural changes bringing about hardening of the material were studied thoroughly. In the present study, we follow up by revealing the effect of this hardening on mechanical properties in tension and show the beneficial effect of heat treatment on removing the observed instability. Hardening associated with increasing the proportion of HCP epsilon-phase and with the precipitation of sigma-phase has a detrimental effect on material plasticity and can be negatively affect the fatigue too. We thus applied a two-stage heat treatment comprising solution annealing at 1473 K/2 h and aging at 1173 K/5 h. Not only it induced material stability but also increased the material strength with not such a detrimental decrease in material plasticity as was brought by direct aging at 1173 K/5 h.
Anglický abstrakt
Laser powder bed fusion (L-PBF) of Co-28Cr-6Mo alloy is a powerful tool for many engineering applications but one has to be familiar with its microstructural instability in the as-produced state. In our previous study [Roudnicka et al., Additive Manuf. 44 (2021) 102025], we depicted the phenomenon of this instability when exposing the material to temperatures above 673 K. Microstructural changes bringing about hardening of the material were studied thoroughly. In the present study, we follow up by revealing the effect of this hardening on mechanical properties in tension and show the beneficial effect of heat treatment on removing the observed instability. Hardening associated with increasing the proportion of HCP epsilon-phase and with the precipitation of sigma-phase has a detrimental effect on material plasticity and can be negatively affect the fatigue too. We thus applied a two-stage heat treatment comprising solution annealing at 1473 K/2 h and aging at 1173 K/5 h. Not only it induced material stability but also increased the material strength with not such a detrimental decrease in material plasticity as was brought by direct aging at 1173 K/5 h.
Klíčová slova anglicky
Co-28Cr-6Mo; Additive manufacturing; Laser powder bed fusion; Elevated temperatures operation; Heat treatment
Vydáno
25.04.2021
Nakladatel
ELSEVIER
Místo
AMSTERDAM
ISSN
2214-8604
Ročník
47
Číslo
2021
Strany od–do
1–14
Počet stran
14
BIBTEX
@article{BUT177082,
author="Michaela {Roudnická} and Jiří {Kubásek} and Libor {Pantělejev} and Orsolya {Molnárová} and Jiří {Bigas} and Jan {Drahokoupil} and David {Paloušek} and Dalibor {Vojtěch},
title="Heat treatment of laser powder-bed-fused Co-28Cr-6Mo alloy to remove its microstructural instability by massive FCC -> HCP transformation",
year="2021",
volume="47",
number="2021",
month="April",
pages="1--14",
publisher="ELSEVIER",
address="AMSTERDAM",
issn="2214-8604"
}