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Writing and Low-Temperature Characterization of Oxide Nanostructures
Published on: July 18, 2014
Effect of Two-Step Austempering Process on Transformation Kinetics of Nanostructured Bainitic Steel
Chunhe Chu1, Yuman Qin2, Xuemei Li3,4
1State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, China. chuchunheysu@sina.com.
Abstract:
The two-step austempering process has been reported to be an effective method to accelerate the bainitic transformation process by introducing martensite (Q-M-B). However, in this study, it was found that the Q-M-B process reduced the incubation time, but the transformation duration remained nearly unchanged. The notably reduced activation energy barrier for nucleation of bainitic ferrite on the preformed martensite should be responsible for the reduced duration time of the Q-M-B process. A process that both of the two steps were above, Ms (Q-B-B), has been demonstrated to increase transformation rate and improve the amount of bainitic ferrite, which probably results from the additional hysteresis free energy provided by the first quenching process.
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