Evaluation of post weld heat treatment quality of modified 9Cr-1Mo (P91) steel weld by magnetic coercive force measurements

This paper presents a novel technique for evaluation of quality of post weld heat treatment (PWHT) of modified 9Cr-1Mo (P91) steel weld by correlation with its magnetic coercive force (MCF). The MCF of modified 9Cr-1Mo steel was studied in respect of different PWHT cycles involving ordered variation...

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Bibliographic Details
Published in:Archives of Civil and Mechanical Engineering 2015-09, Vol.15 (4), p.847-853
Main Authors: Sudharsanam, V., Senthilkumar, V., Raju, N., Vetriselvan, R.
Format: Article
Language:English
Subjects:
Chromium molybdenum steels
Civil Engineering
Coercivity
Engineering
Force measurement
Mechanical Engineering
Original Research Article
Post-weld heat treatment
Soaking
Structural Materials
Weld metal
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Summary:This paper presents a novel technique for evaluation of quality of post weld heat treatment (PWHT) of modified 9Cr-1Mo (P91) steel weld by correlation with its magnetic coercive force (MCF). The MCF of modified 9Cr-1Mo steel was studied in respect of different PWHT cycles involving ordered variations of soaking temperature unto 770°C and soaking time unto 140 min. It was observed that MCF of the weld metal reduced with increase in both the soaking temperature and soaking time of PWHT. The drop in MCF of welds after PWHT was found to be dependent on the drop in the hardness of the weld and on the degree of carbide precipitations seen in the weld microstructure. Based on the study, a criterion was evolved for evaluation of heat treatment quality of the weld.
ISSN:1644-9665
2083-3318
DOI:10.1016/j.acme.2015.05.006