Author： Hu F Wu K M Misra R D K
Publisher： Maney Publishing
ISSN： 1743-2847
Source： Materials Science and Technology, Vol.28, Iss.11, 2012-11, pp. : 1314-1319
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Abstract
Nanostructured martensite-austenite microstructure was achieved by a quenching-partitioning-tempering (Q-P-T) treatment of high carbon low temperature bainitic steel. Microstructure observations showed that the nanostructured steel consisted of fine martensite (about 25 nm in thickness), retained austenite and carbides. X-ray diffraction analysis indicated that carbon was partitioned into austenite after martensite transformation. High hardness (about 655 HV1) and relatively high retained austenite fraction (0·36-0·41) was attained. The heat treatment times were greatly reduced, nearly equal or higher hardness and retained austensite fraction were achieved by Q-P-T treatment, compared with low temperature super bainite process.
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