Effect of cooling rate on microstructural formation and hardness of 30CrNi3Mo steel |
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| Authors: | Z X Qiao Y C Liu L M Yu and Z M Gao |
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| Institution: | (1) School of Materials Science & Engineering, Tianjin Key Laboratory of Composite and Functional Materials, Tianjin University, Tianjin, 300072, China;(2) School of Mechanical Engineering, Tianjin University of Commerce, Tianjin, 300134, China |
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| Abstract: | The variation of microstructural formation and the hardness of the 30CrNi3Mo steel were systematically explored as a function
of applied cooling rates in the range of 1–500°C/min. According to the measured Rockwell hardness results, four characteristic
stages could be separated as different ranges of cooling rates, which corresponds well with the microstructural evolution
observed. With the applied cooling rate increasing, the transformed structure evolves from granular bainite, lower bainite,
self-tempered martensite, to finally martensite without self-tempering. Among them, the self-tempered martensite, obtained
in the transformed specimens cooled with rates of 25–80°C/min, exhibits the highest hardness values due to the precipitation
of fine carbides within it. |
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| Keywords: | PACS" target="_blank">PACS 61 66 Dk 64 70 K- 81 40 -z |
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