Effect of cooling parameters on the microstructure and properties of Mo-bearing and Cr-bearing steels |
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Authors: | Xiang-dong Huo Yu-qian Li Yu-tao Zhao Hai-wang Zhang Zhao-hui Li |
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Institution: | (1) Department of Materials Science and Engineering, Tsinghua University, Beijing, 100084, China;(2) Tubular Goods Research Center of CNPC, Xi’an, 710065, China |
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Abstract: | To develop low-cost low carbon bainitic steel, Mo-bearing and Cr-bearing steels were melted in a vacuum induction furnace
and were researched by thermal simulation and hot rolling at the laboratory. As the cooling rate increases from 0.2 to 50°C/s,
the transformation temperatures of two steels lie between 650 and 400°C, and the final microstructures of them change from
quasi-polygonal ferrite and granular bainite to lath bainite. Compared with cooling in air or by interrupted cooling, Mo-bearing
and Cr-bearing steel plates cooled by sprayed water boast higher strength and superior toughness, for large-size islands are
responsible for the poor mechanical properties. Compared to Mo, Cr is effective to isolate the bainitic reaction in low carbon
steel, and the bainitic microstructure can also be obtained in Cr-bearing steel cooled at a wide range of cooling rate. |
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Keywords: | |
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