| Abstract: | The hot‐cracking susceptibility of a material is usually evaluated by means of a characteristic temperature range, the so‐called brittle‐temperature‐range (BTR). The upper bound of the BTR is determined by the zero‐strength‐temperature (ZST), the lower limit is defined by the zero‐ductility‐temperature (ZDT). In the present work both ZDT and ZST are related to the current amount of residual liquid during solidification, which in turn is evaluated from a modified Scheil‐Gulliver micro‐segregation model, which takes into account back diffusion of interstitial alloying components. This model is particularly suitable for application to high‐order alloy systems. The calculated values of the ZDT are compared to numerous experimental results from literature and good agreement is achieved. It is demonstrated that the application of the classical Scheil‐Gulliver model does not give feasible results. |
