Effect of post weld heat treatment on fusion and heat affected zone microstructure and mechanical properties of inconel X-750 welds
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Publication Details
Author list: Peasura P., Poopat B.
Publisher: Trans Tech Publications
Publication year: 2011
Volume number: 214
Start page: 108
End page: 112
Number of pages: 5
ISBN: 9783037850633
ISSN: 1022-6680
eISSN: 1662-8985
Languages: English-Great Britain (EN-GB)
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Abstract
The Inconel X-750 indicates good hot corrosion resistance, high stability and strength at high temperatures and for this reason the alloy is used in manufacturing of gas turbine hot components. The objective of this research was study the effect of post weld heat treatment (PWHT) on fusion zone and heat affected zone microstructure and mechanical properties of Inconel X-750 weld. After welding, samples were solutionized at 1500ฐC. Various aging temperature and times were studied. The results show that aging temperature and time during PWHT can greatly affect microstructure and hardness in fusion zone and heat affected zone. As high aging temperature was used, the grain size also increased and M 23C 6 at the grain boundary decreased. This can result in decreased of hardness. Moreover excessive aging temperature can result in increasing MC carbide intensity in parent phase (austenite). It can also be observed that M 23C 6 at the grain boundary decreased due to high aging temperature. This resulted in decreasing of hardness of weld metal and heat affected zone. Experimental results showed that the aging temperature 705ฐC aging time of 24 hours provided smaller grain size, suitable size and intensity of MC carbide resulting in higher hardness both in weld metal and HAZ. ฉ (2011) Trans Tech Publications.
Keywords
Inconel X-750, Post Weld heat treatment
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