Prediction of Prior Austenite Grain Size of High-phosphorous Steels through Phase Transformation Simulation

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著者

    • KIM Han S.
    • Ecomaterials Center, National Insttute for Materials Science (NIMS)
    • KOBAYASHI Yoshinao
    • Metallurgical Processing Group, Steel Research Center, National Institute for Materials Science (NIMS)
    • NAGAI Kotobu
    • Metallurgical Processing Group, Steel Research Center, National Institute for Materials Science (NIMS)

抄録

The effects of phosphorous content and cooling rate on the phase evolution of low carbon steels were analyzed by DICTRA simulation focusing on the micro-segregation behavior of phosphorous during solidification and subsequent cooling process. Through the phase transformation simulation, the effects of metallurgical parameters such as P content, cooling rate, and primary dendrite arm spacing on the starting temperature of austenite grain growth were clarified. Using the values of austenite grain growth starting temperature calculated by the phase transformation simulation, prior austenite grain size of low carbon steels were estimated based on a classical grain growth modeling in a P content range from 0.01 to 0.20 mass% and in a wide cooling rate range from 1.7 to 800 K s<sup>−1</sup>. The prior austenite grain size predicted with the present approach showed good agreement with a group of selected experimental data of 100 mm thick slabs and 2 mm thick strips.

収録刊行物

  • ISIJ international  

    ISIJ international 46(6), 854-858, 2006-06-15 

    The Iron and Steel Institute of Japan

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