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Metals 2016, 6(5), 119; doi:10.3390/met6050119

The Varying Effects of Uniaxial Compressive Stress on the Bainitic Transformation under Different Austenitization Temperatures

1
The State Key Laboratory of Refractories and Metallurgy, Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education, Wuhan University of Science and Technology, Wuhan 430081, China
2
State Key Laboratory of Development and Application Technology of Automotive Steels (Baosteel Group), Shanghai 201900, China
*
Author to whom correspondence should be addressed.
Academic Editor: Hugo Lopez
Received: 17 April 2016 / Revised: 6 May 2016 / Accepted: 11 May 2016 / Published: 20 May 2016
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Abstract

In this study, thermal simulation experiments under different austenitization temperatures and different stress states were conducted. High-temperature laser scanning confocal microscopy (LSCM), thermal dilatometry, and scanning electron microscope (SEM) were used to quantitatively investigate the effects of the uniaxial compressive stress on bainitic transformation at 330 °C following different austenitization temperatures. The transformation plasticity was also analyzed. It was found that the promotion degree of stress on bainitic transformation increases with the austenitization temperature due to larger prior austenite grain size as well as stronger promoting effect of mechanical driving force on selected variant growth at higher austenitization temperatures. The grain size and the yield strength of prior austenite are other important factors which influence the promotion degree of stress on bainitic transformation, besides the mechanical driving force provided by the stress. Moreover, the transformation plasticity increases with the austenitization temperature. View Full-Text
Keywords: bainitic transformation; stress; transformation plasticity; austenitization temperature bainitic transformation; stress; transformation plasticity; austenitization temperature
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Zhou, M.; Xu, G.; Wang, L.; Yuan, Q. The Varying Effects of Uniaxial Compressive Stress on the Bainitic Transformation under Different Austenitization Temperatures. Metals 2016, 6, 119.

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