Identification of microstructural zones and thermal cycles in a weldment of modified 9Cr-1Mo steel |
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Authors: | V Thomas Paul S Saroja P Hariharan A Rajadurai M Vijayalakshmi |
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Affiliation: | (1) Physical Metallurgy Section, Metallurgy and Materials Group, Indira Gandhi Centre for Atomic Research, Kalpakkam, 603 102, India;(2) Department of Manufacturing Engineering, Anna University, Chennai, 600 025, India;(3) Department of Production Engineering, Madras Institute of Technology, Chennai, 600 044, India |
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Abstract: | This paper presents the results of a study on the microstructural and microchemical variations in a multipass Gas Tungsten
Arc weld (GTAW) of modified 9Cr-1Mo steel. The changes brought about in the steel due to the heating and cooling cycles during
welding and the subsequent effects due to reheating effects during multipass welding are described. Detailed analytical transmission
electron microscopy has been carried to study the type and composition of the primary and secondary phases in this steel.
The systematic changes in microstructural parameters such as Prior Austenite Grain Size, martensite lath size, number density,
size and microchemistry of carbides, have been understood based on the different transformations that the steel undergoes
during the heating and cooling process. Based on the observed microstructure, an attempt has been made to identify distinct
microstructural zones and possible thermal cycles experienced by different regions of the weldment. |
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