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Low temperature impact toughness controlling for Ti-microalloyed high strength steel |
YANG Yue-biao1,2, LI Zong-qiang2, DENG Shen2, FAN Lei2, LIU Qing-you3, ZHAO Zheng-zhi1 |
1. Collaborative Innovation Center of Steel Technology, University of Science and Technology Beijing, Beijing 100083, Beijing, China; 2. Technical Center, Guangxi Liuzhou Iron and Steel Group Company Limited, Liuzhou 545002, Guangxi, China; 3. Institute of Structural Steels, Central Iron and Steel Research Institute, Beijing 100081, China |
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Abstract To solve the problem of inferior low-temperature impact toughness of hot-rolled titanium microalloyed high-strength steel,the reasons were analyzed from the aspects of impact fracture morphology,second phase of TiN and metallographic structure by means of the optical microscope,the scanning electron microscope,the energy dispersive spectrometer and other devices combined with thermodynamics and kinetics calculation. The analysis results showed that the main reasons for the inferior low-temperature impact toughness of the test steel are as follows. The presence of large particles of the second phase of TiN in steel,serious pearlite banded structure and uneven size distribution in steel,the effect of large TiN particles was more significant. By adding the processes of KR hot metal desulfurization and RH refining,improving the secondary cooling strength of continuous casting,reducing the mass percent of C,N in steel and other optimization measures,and therefore,the size of large TiN particles was reduced,the grade of pearlite banded structure in steel was reduced,as well as the proportion of soft phase structure of ferrite and the microstructure uniformity were increased. The low-temperature impact toughness of hot-rolled titanium microalloyed high-strength steel was improved significantly and the qualified rate was increased to 100%.
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Received: 29 July 2020
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