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Stress relaxation behaviour and mechanism of heat treated inconel 718 in high temperature environments

The stress relaxation behaviour of heat treated nickel-base superalloy Inconel 718 at high temperature was investigated. Solution treatment was applied on the as-received material at 980 oC for 1 hour before water quenching followed by double aging treatments at 720 oC for 8 hours and 621 oC for...

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Main Authors: Bapokutty, Omar, Sajuri, Zainuddin, Junaidi, Syarif
Format: Article
Language:English
Published: AMREC SIRIM Malaysia 2013
Subjects:
TJ Mechanical engineering and machinery
Online Access:http://eprints.utem.edu.my/id/eprint/11485/1/Stress_Relaxation_Behaviour_and_Mechanism_of_Heat_Treated_Inconel_718_in_High_Temperature_Environments.doc
http://eprints.utem.edu.my/id/eprint/11485/
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spelling my.utem.eprints.114852023-07-06T12:01:12Z http://eprints.utem.edu.my/id/eprint/11485/ Stress relaxation behaviour and mechanism of heat treated inconel 718 in high temperature environments Bapokutty, Omar Sajuri, Zainuddin Junaidi, Syarif TJ Mechanical engineering and machinery The stress relaxation behaviour of heat treated nickel-base superalloy Inconel 718 at high temperature was investigated. Solution treatment was applied on the as-received material at 980 oC for 1 hour before water quenching followed by double aging treatments at 720 oC for 8 hours and 621 oC for 8 hours, then cooled in air. The stress relaxation test was conducted at 1 % strain at different test temperatures of 550 oC, 650 oC and 750 oC. The tests were carried out for a total of 72 hours. The tests were interrupted at 3 hours and 48 hours to investigate the evolution of microstructure and changes in material properties by using Scanning Electron Microscope (SEM) and X-Ray Diffractometer (XRD). The results showed that thermal dependent stress increased with decreasing temperature. In contrast, stress relaxation rate increased with increasing temperature. Microstructure observation by SEM showed that recovery process occurred. This was further supported by the decrease in dislocation density with increase in time and temperature, which is in-line with the Vickers micro-hardness results. AMREC SIRIM Malaysia 2013 Article PeerReviewed text en http://eprints.utem.edu.my/id/eprint/11485/1/Stress_Relaxation_Behaviour_and_Mechanism_of_Heat_Treated_Inconel_718_in_High_Temperature_Environments.doc Bapokutty, Omar and Sajuri, Zainuddin and Junaidi, Syarif (2013) Stress relaxation behaviour and mechanism of heat treated inconel 718 in high temperature environments. Journal of Industrial Technology SIRIM, 21 (1). pp. 43-51. ISSN 0128-4940
institution Universiti Teknikal Malaysia Melaka
building UTEM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Teknikal Malaysia Melaka
content_source UTEM Institutional Repository
url_provider http://eprints.utem.edu.my/
language English
topic TJ Mechanical engineering and machinery
spellingShingle TJ Mechanical engineering and machinery
Bapokutty, Omar
Sajuri, Zainuddin
Junaidi, Syarif
Stress relaxation behaviour and mechanism of heat treated inconel 718 in high temperature environments
description The stress relaxation behaviour of heat treated nickel-base superalloy Inconel 718 at high temperature was investigated. Solution treatment was applied on the as-received material at 980 oC for 1 hour before water quenching followed by double aging treatments at 720 oC for 8 hours and 621 oC for 8 hours, then cooled in air. The stress relaxation test was conducted at 1 % strain at different test temperatures of 550 oC, 650 oC and 750 oC. The tests were carried out for a total of 72 hours. The tests were interrupted at 3 hours and 48 hours to investigate the evolution of microstructure and changes in material properties by using Scanning Electron Microscope (SEM) and X-Ray Diffractometer (XRD). The results showed that thermal dependent stress increased with decreasing temperature. In contrast, stress relaxation rate increased with increasing temperature. Microstructure observation by SEM showed that recovery process occurred. This was further supported by the decrease in dislocation density with increase in time and temperature, which is in-line with the Vickers micro-hardness results.
format Article
author Bapokutty, Omar
Sajuri, Zainuddin
Junaidi, Syarif
author_facet Bapokutty, Omar
Sajuri, Zainuddin
Junaidi, Syarif
author_sort Bapokutty, Omar
title Stress relaxation behaviour and mechanism of heat treated inconel 718 in high temperature environments
title_short Stress relaxation behaviour and mechanism of heat treated inconel 718 in high temperature environments
title_full Stress relaxation behaviour and mechanism of heat treated inconel 718 in high temperature environments
title_fullStr Stress relaxation behaviour and mechanism of heat treated inconel 718 in high temperature environments
title_full_unstemmed Stress relaxation behaviour and mechanism of heat treated inconel 718 in high temperature environments
title_sort stress relaxation behaviour and mechanism of heat treated inconel 718 in high temperature environments
publisher AMREC SIRIM Malaysia
publishDate 2013
url http://eprints.utem.edu.my/id/eprint/11485/1/Stress_Relaxation_Behaviour_and_Mechanism_of_Heat_Treated_Inconel_718_in_High_Temperature_Environments.doc
http://eprints.utem.edu.my/id/eprint/11485/
_version_ 1772815982719401984
score 13.211869

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