Designing experiments to affect post weld heat treatment parameters: Using the full factorial design in inconel X-750 welds
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Publication Details
Author list: Peasura P., Poopat B.
Publisher: Trans Tech Publications
Publication year: 2013
Volume number: 711
Start page: 188
End page: 194
Number of pages: 7
ISBN: 9783037856970
ISSN: 1022-6680
eISSN: 1662-8985
Languages: English-Great Britain (EN-GB)
Abstract
Alloy X-750 also has excellent properties down to cryogenic temperatures high stability and strength at high temperatures. This reason the alloy is used in manufacturing of gas turbine hot components. The research was study the effect of post weld heat treatment (PWHT) parameter on hardness and microstructure. The specimen was Inconel X-750 grade sheet of 2.8 mm thickness. This 23 factorial design was used in experimental various post weld heat treatment at 705 and 845oC for 20 and 24 hour including solution temperature at 1,000 and 1,150oC. The welded specimens were tested by hardness testing in fusion zone (FZ) and heat affected zone (HAZ). The result showed that both of solution temperature, PWHT temperature and PWHT time interaction on hardness of FZ and HAZ at 95% confidential (P value < 0.05). The PWHT temperature and PWHT time interaction effect was the largest. The factor showed in the hardness increase with the low level (-1) of PWHT temperature and PWHT time for the hardness while it trended decrease for the solution temperature. The microstructure was the γ′ amount and small size would result in high hardness. Experimental results showed that the solution temperature at 1,150oC, PWHT temperature 7050C PWHT time of 20 hours provided intensity of gamma prime (γ′) and MC carbide resulting in higher hardness both in FZ and HAZ. © (2013) Trans Tech Publications, Switzerland.
Keywords
Inconel X-750
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