Effect of Warm Rolling Process on Phase Transformation, Microstructure and Mechanical Properties of Nano-bainite Steel

doi:10.11901/1005.3093.2014.289

Chinese Journal of Materials Research

2015, Vol. 29

Issue (3): 207-212 DOI: 10.11901/1005.3093.2014.289

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Effect of Warm Rolling Process on Phase Transformation, Microstructure and Mechanical Properties of Nano-bainite Steel

Jianguo HE^1,²,Aimin ZHAO^1,^2,^**(

),Yao HUANG³,Chao ZHI^1,²,Fuqing ZHAO^1,²

1. Metallurgical Engineering Research Institute, University of Science and Technology Beijing,
Beijing 100083, China
2. Beijing Laboratory for Modern Transportation Advanced Metal Materials and Processing Technology,
Beijing 100083, China
3. China Electric Power Research Institute, Beijing 100192, China

Cite this article:

Jianguo HE,Aimin ZHAO,Yao HUANG,Chao ZHI,Fuqing ZHAO. Effect of Warm Rolling Process on Phase Transformation, Microstructure and Mechanical Properties of Nano-bainite Steel. Chinese Journal of Materials Research, 2015, 29(3): 207-212.

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Abstract

Nanostructured bainite steel with an ultimate tensile strength of 2127 MPa, elongation of 4% has been obtained by warm rolling followed with isothermal heat treatment.The effect of deformation temperature on transformation of nano bainites has been investigated. The results show that with a proper warm defromation, the time required for the transformation of the supercooled austenite into bainite can be shortened from 50 h to 20 h. The deformation rates of supercooled austenite adopted at all temperatures in the experiments can accelerate the low temperature nanobainite transformation, while the transformation rate increased with the decreasing deformation temperature. With a deformation rate above 30%, the retained austenites were sharply refined and the blocky austenites were diminished. The low temperature nano bainite transformation can be accelerated by warm rolling process without harm to the strength, thus shortening the time of heat treatment resulting in cost saving of the steel production.

Key words: metallic materials nanobainite warm rolling transformation kinetic microstructure mechanical properties

Received: 17 June 2014

Fund: *Supported by National Natural Science Foundation of China Nos.51271035 & 51371032.

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	Fuqing ZHAO

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https://www.cjmr.org/EN/10.11901/1005.3093.2014.289 OR https://www.cjmr.org/EN/Y2015/V29/I3/207

Fig.1 Schematic illustration of in situ deformation experiment

Fig.2 Warm rolling process diagrams

Fig.3 Kinetic of austemperedNanoBainite transformation

Fig.4 Effect of deformation (20%) at different temperature on nanobainite transformation kinetic

Fig.5 Nanobainite transformation rate corresponding to Fig.4

Fig.6 SEM images of nanobainite steels after different process, NB-nanobainite, g-retained austenite, (a) isothermal at 503 K for 2 weeks and (b) 3 passes rolling, (c) 4 passes rolling, (d) 5 passes rolling followed by isothermal at 503 K for 20 hours

Fig.7 TEM images of warm rolling nanobainite steels, (a) 4 passes warm rolling, (b) 6 passes warm rolling followed by isothermal at 503 K for 20 hours

Table 1 Properties of austemered and warm rolling nanobainite steels

Fig.8 Content of retain austenite (RA) in samples of different processes and carbon concentration in retain austenite

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