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| Effect of deformation twinning on high-temperature performance of cold-rolled S31042 steel |
| Yan-mo Li1, Yong-chang Liu1, Li-ming Yu1, Chen-xi Liu1, Chong Li1, Yuan Huang1, Hui-jun Li1, Zong-qing Ma1 |
| 1 State Key Lab of Hydraulic Engineering Simulation and Safety, School of Materials Science and Engineering, Tianjin University, Tianjin 300354, China |
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Abstract Influence of deformation twinning on high-temperature instantaneous performance of cold-rolled S31042 steel was investigated by optical microscopy, scanning electron microscopy, transmission electron microscopy, and high-temperature tensile test. An increasing number of deformation twins have formed as the cold rolling reduction degree increases during the cold rolling process. During the tensile process at 700 °C, M23C6 particles generated along the deformation twin boundaries, and NbCrN nanoparticles dispersedly precipitated throughout the austenite grains. For the high-temperature tensile sample subjected to cold reduction for 80%, it is observed from the fractured cross section that numerous deformation twin boundaries were decorated by discontinuous M23C6 particles. Therefore, austenite grains were divided into several independent zones by the deformation twins, and the grains were refined. Due to the grain refinement strengthening and precipitation strengthening, the high-temperature temporal strength of the 80% cold-rolled sample was significantly improved, and simultaneously, this sample exhibited favorable high-temperature elongation.
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Received: 14 March 2018
Published: 16 May 2018
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| Cite this article: |
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Yan-mo Li,Yong-chang Liu,Li-ming Yu, et al. Effect of deformation twinning on high-temperature performance of cold-rolled S31042 steel[J]. Journal of Iron and Steel Research International, 2019, 26(7): 704-711.
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2019, Vol. 26 
