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Report No.

Effect of prior martensite on bainite transformation in nanobainite steel

Gong, W.; Tomota, Yo*; Harjo, S.; Su, Y.; Aizawa, Kazuya

Nanobainite transformation behavior was comparably studied using in situ neutron diffraction measurements, scanning electron microscopy and electron backscatter diffraction observations for two heat treatments: with and without partial quenching before isothermal holding at 523 or 573 K. Prior martensite transformation was found to accelerate the subsequent nanobainite transformation. Bainitic lathes formed adjacent to a pre-existing martensite plate exhibited an almost identical orientation. Dislocations introduced in austenite due to stress relaxation of transformation strains are believed to assist bainite transformation accompanying variant selection.



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Category:Materials Science, Multidisciplinary



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