Effects of heat treatment and high-temperature oxidation on 3D-printed Inconel718 alloy

  • Anushraj B Department of Mechanical Engineering & Centre for Surface Engineering, Kalasalingam Academy of Research & Education, Virudhunagar, Tamilnadu, India
  • Winowlin Jappes Department of Mechanical Engineering & Centre for Surface Engineering, Kalasalingam Academy of Research & Education, Virudhunagar, Tamilnadu, India
  • Assoc. Prof. Adam Khan Department of Mechanical Engineering & Centre for Surface Engineering, Kalasalingam Academy of Research & Education, Virudhunagar, Tamilnadu, India
  • N C Brintha Department of Computer Science and Engineering & Centre for Surface Engineering, Kalasalingam Academy of Research & Education, Virudhunagar, Tamilnadu, India
  • P M Mashinini Department. of Mechanical and Industrial Engineering Technology, University of Johannesburg, Johannesburg, South Africa
DOI: https://doi.org/10.36909/jer.17965

Abstract

In the present paper, Inconel 718 alloy was prepared by direct metal laser sintering. The bare alloy was post-processed through different heat-treatment routes, and the changes in its metallurgical and microstructural properties were investigated. In comparison to the bare alloy, grains in the overlapping region of the heat-treated alloys became refined. The strengthening phase of γ’ and γ” precipitations was high in the heat-treated alloys. Furthermore, cyclic oxidation studies were conducted on the bare and heat-treated samples at 1000°C. The variation in mass change per unit area and the corresponding corrosion mechanism were explored. Moreover, the formation mechanism of surface oxides under the influence of each alloying element was discussed. Chromium oxides were mainly formed during oxidation, and the mass change of the heat-treated alloys increased with these oxides. Therefore, an appropriate heat-treatment plan is highly recommended to prevent an alloy from continuous degradation and oxide formation.

Published
2022-08-17
Issue
Online First Articles
Section
Computer Engineering