Effect of Cooling Rate on ZST, LIT and ZDT of Carbon Steels Near Melting Point
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.
- ISIJ international
ISIJ international 38(10), 1093-1099, 1998-10-15
The Iron and Steel Institute of Japan