Microstructure Evolution of MAR-M302 Superalloy During Heat Treatment at High Temperatures |
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| Authors: | A. Jafari A. Khorram S. M. A. Boutorabi |
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| Affiliation: | 1.Department of Material and Metallurgy Engineering,Iran University of Industries and Mines (IUIM),Tehran,Iran;2.Department of Mechanical Engineering,K.N. Toosi University of Technology,Tehran,Iran;3.Center of Excellence for High Strength Alloys Technology (CEHSAT), School of Metallurgy and Materials,Iran University of Science and Technology,Tehran,Iran |
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| Abstract: | In this study, the changes in microstructure of MAR-M302 cobalt based superalloy, when subjected to different heat treatments have been investigated. Heat treatments considered here involve solution treatment followed by controlled precipitation at lower temperatures. As-cast MAR-M302 superalloy includes the MC carbides as a discrete blocky dispersion with Chinese script morphology and the eutectic M23C6 and M6C carbides. Our results show that the eutectic M6C carbides remain on the microstructure at 1200 °C. Moreover, when reaching 1275 °C the eutectic M23C6 carbides disappear and a large amount of eutectic M6C carbides is dissolved. Also, fine Cr-rich M23C6 secondary carbides precipitates through the matrix at aging temperature 900 °C. The optimum microstructure and hardness are achieved during solution at 1275 °C for 4 h and aging at 900 °C for 16 h. |
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