Effect of Pre-Existing Martensite on Bainitic Transformation in Low-Temperature Bainite Steel

Peng Zhou; Hui Guo; Ai Min Zhao; Zhu Kai Yin; Jia Xing Wang

doi:10.4028/www.scientific.net/MSF.898.803

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HomeMaterials Science ForumMaterials Science Forum Vol. 898Effect of Pre-Existing Martensite on Bainitic...

Effect of Pre-Existing Martensite on Bainitic Transformation in Low-Temperature Bainite Steel

Abstract:

The effect of different volume fractions of pre-existing martensite on the low-temperature bainitic transformation and microstructures was quantitatively analyzed by dilatometer, optical microscope and scanning electron microscope. The results showed that pre-existing martensitic transformation accelerated the subsequent low-temperature bainitic transformation, and the incubation period and completion time of bainitic reaction were significantly shortened. This phenomenon was attributed to the increasing nucleation sites caused by the introduced dislocations in austenite due to the formation of pre-existing martensite. However, it was noteworthy that, because of the increased bainitic plates adjacent to the pre-existing martensitic plates, the probability of the impingement of bainitic plates during growth was increased, which resulted in a decrease in the maximum attainable volume fraction of bainite.

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Materials Science Forum (Volume 898)

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803-809

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https://doi.org/10.4028/www.scientific.net/MSF.898.803

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Online since:

June 2017

Authors:

Peng Zhou*, Hui Guo, Ai Min Zhao, Zhu Kai Yin, Jia Xing Wang

Keywords:

Incubation Period, Low-Temperature Bainite, Phase Transformation Kinetics, Pre-Existing Martensite

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