Detail publikace

Effect of Preheating on the Residual Stress and Material Properties of Inconel 939 Processed by Laser Powder Bed Fusion

MALÝ, M. NOPOVÁ, K. KLAKURKOVÁ, L. ADAM, O. PANTĚLEJEV, L. KOUTNÝ, D.

Originální název

Effect of Preheating on the Residual Stress and Material Properties of Inconel 939 Processed by Laser Powder Bed Fusion

Typ

článek v časopise ve Web of Science, Jimp

Jazyk

angličtina

Originální abstrakt

One of the main limitations of laser powder bed fusion technology is the residual stress (RS) introduced into the material by the local heating of the laser beam. RS restricts the processability of some materials and causes shape distortions in the process. Powder bed preheating is a commonly used technique for RS mitigation. Therefore, the objective of this study was to investigate the effect of powder bed preheating in the range of room temperature to 400 °C on RS, macrostructure, microstructure, mechanical properties, and properties of the unfused powder of the nickel-based superalloy Inconel 939. The effect of base plate preheating on RS was determined by an indirect method using deformation of the bridge-shaped specimens. Inconel 939 behaved differently than titanium and aluminum alloys when preheated at high temperatures. Preheating at high temperatures resulted in higher RS, higher 0.2% proof stress and ultimate strength, lower elongation at brake, and higher material hardness. The increased RSs and the change in mechanical properties are attributed to changes in the microstructure. Preheating resulted in a larger melt pool, increased the width of columnar grains, and led to evolution of the carbide phase. The most significant microstructure change was in the increase of the size and occurrence of the carbide phase when higher preheating was applied. Furthermore, it was detected that the evolution of the carbide phase strongly corresponds to the build time when high-temperature preheating is applied. Rapid oxidation of the unfused powder was not detected by EDX or XRD analyses.

Klíčová slova

laser powder bed fusion; selective laser melting; Inconel 939; preheating; residual stress

Autoři

MALÝ, M.; NOPOVÁ, K.; KLAKURKOVÁ, L.; ADAM, O.; PANTĚLEJEV, L.; KOUTNÝ, D.

Vydáno

13. 9. 2022

Nakladatel

MDPI

Místo

Švýcarsko

ISSN

1996-1944

Periodikum

Materials

Ročník

15

Číslo

18

Stát

Švýcarská konfederace

Strany počet

16

URL

https://www.mdpi.com/1996-1944/15/18/6360

Plný text v Digitální knihovně

http://hdl.handle.net/11012/208457

BibTex

@article{BUT179116,
  author="Martin {Malý} and Klára {Nopová} and Lenka {Klakurková} and Ondřej {Adam} and Libor {Pantělejev} and Daniel {Koutný}",
  title="Effect of Preheating on the Residual Stress and Material Properties of Inconel 939 Processed by Laser Powder Bed Fusion",
  journal="Materials",
  year="2022",
  volume="15",
  number="18",
  pages="16",
  doi="10.3390/ma15186360",
  issn="1996-1944",
  url="https://www.mdpi.com/1996-1944/15/18/6360"
}