Stress relaxation behavior of heat treated Inconel 718

O. Bapokutty, Zainuddin Sajuri, J. Syarif

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

The stress relaxation of heat treated nickel-based superalloy, Inconel 718 at 1% strain and high temperature was investigated. Solution treatment was applied on the as-received material at 980°C for 1 h before water quenched followed by double aging treatments at 720 and 621°C for 8 h, respectively and then cooled in air. There are basically, two stages involved in stress relaxation namely transformation-controlled at the beginning of test and creep-controlled at later stage. Different temperatures show that two stages are present. This study has found that recovery process at grain boundary decreased Vickers micro-hardness and dislocation density due to prolonged relaxation time and further decreasing by increasing temperature.

Original languageEnglish
Pages (from-to)870-875
Number of pages6
JournalJournal of Applied Sciences
Volume12
Issue number9
DOIs
Publication statusPublished - 2012

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stress relaxation
heat
temperature
nickel
hardness
air
water
testing

Keywords

  • Creep
  • Heat treatment
  • Inconel 718
  • Microstructure
  • Stress relaxation

ASJC Scopus subject areas

  • General

Cite this

Stress relaxation behavior of heat treated Inconel 718. / Bapokutty, O.; Sajuri, Zainuddin; Syarif, J.

In: Journal of Applied Sciences, Vol. 12, No. 9, 2012, p. 870-875.

Research output: Contribution to journalArticle

Bapokutty, O. ; Sajuri, Zainuddin ; Syarif, J. / Stress relaxation behavior of heat treated Inconel 718. In: Journal of Applied Sciences. 2012 ; Vol. 12, No. 9. pp. 870-875.
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