Publication detail

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.

Original Title

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

Type

journal article in Web of Science

Language

English

Original Abstract

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.

Keywords

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

Authors

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

Released

13. 9. 2022

Publisher

MDPI

Location

Švýcarsko

ISBN

1996-1944

Periodical

Materials

Year of study

15

Number

18

State

Swiss Confederation

Pages count

16

URL

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

Full text in the Digital Library

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"
}