Effect of Cooling Rate on ZST, LIT and ZDT of Carbon Steels Near Melting Point

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著者

    • WON Young mok
    • School of Materials Science and Engineering and Research Institute of Advanced Materials, Seoul National University
    • YEO Tae-jung
    • School of Materials Science and Engineering and Research Institute of Advanced Materials, Seoul National University
    • OH Kyu hwan
    • School of Materials Science and Engineering and Research Institute of Advanced Materials, Seoul National University

抄録

The effect of cooling rate on the characteristic temperatures such as liquidus temperature (<I>T</I><sub><I>L</I></sub>), zero strength temperature (ZST), liquid impenetrable temperature (LIT) and zero ductility temperature (ZDT) has been investigated by calculating the non-equilibrium pseudo binary Fe–C phase diagram. The effect of cooling rate on <I>T</I><sub>L</sub> was not significant. The effect of cooling rate on ZST, LIT and ZDT was significant due to segregation of solute elements at the final stage of solidification. Using the microsegregation analysis proposed by Ueshima, the calculated temperatures at the solid fractions of 0.75 and 0.99 corresponded to the experimentally measured ZST and ZDT, respectively. Prediction equation on ZST, LIT and ZDT, which can take into account cooling rate and steel composition, was proposed. At given steel compositions and cooling rates, the suggested prediction equation on ZST, LIT and ZDT could successfully describe the experimentally measured data and the calculated data from microsegregation analysis.

収録刊行物

  • ISIJ international  

    ISIJ international 38(10), 1093-1099, 1998-10-15 

    The Iron and Steel Institute of Japan

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