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| Microstructure and mechanical properties of 20Si2CrNi3MoV steel treated by HDQP process |
| Chuan-feng Meng1,2,Lei Zhang3,4,Cun-yu Wang3,*,Yu-jie Zhang3,Ying-hui Wei1,**, Yi-de Wang2,Wen-quan Cao3 |
1 School of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, Shanxi, China
2 Taiyuan Iron and Steel Group Co., Ltd., Taiyuan 030003, Shanxi, China
3 Central Iron & Steel Research Institute CISRI, Beijing 100081, China
4 School of Materials Science and Engineering, University of Science & Technology Beijing, Beijing 100083, China |
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Abstract A combined process of hot-deformation plus two-step quenching and partitioning (HDQP) treatment was applied to a low-carbon 20Si2CrNi3MoV steel, and transmission electron microscopy (TEM), scanning electron microscopy (SEM), X-ray diffraction (XRD), Vickers hardness and tension test were used to characterize the microstructure and mechanical properties. More stable retained austenite due to fine microstructures and typical curved micromorphology is obtained, and the newly-treated steel obtains more retained austenite because of the effect of hot deformation. The retained austenite fraction increases and then decreases with the increasing quenching temperature from 200 to 350��C. The maximum retained austenite fraction (18.3%) and elongation (15%) are obtained to enhance the ductility.
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Received: 05 June 2017
Published: 01 December 2017
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2017, Vol. 24 
