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Journal of Applied Sciences
  Year: 2012 | Volume: 12 | Issue: 9 | Page No.: 870-875
DOI: 10.3923/jas.2012.870.875
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Stress Relaxation Behavior of Heat Treated Inconel 718

O. Bapokutty, Z. Sajuri and J. Syarif

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.
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How to cite this article:

O. Bapokutty, Z. Sajuri and J. Syarif, 2012. Stress Relaxation Behavior of Heat Treated Inconel 718. Journal of Applied Sciences, 12: 870-875.

DOI: 10.3923/jas.2012.870.875






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