[T15] Hard Materials

[16P-T15-05] Robustness Analysis of a Constitutive Model for Cemented Carbide Sintering

*L. Rosenblad¹, P.-L. Larsson¹, H. Staf^{1, 2}, H. Larsson¹ (1.KTH, Sweden, 2.Sandvik Coromant, Sweden)

Keywords:Constitutive modelling, Dilatometer experiment

By performing a dilatometer experiment, the measured shrinkage can be used to determine the adjustable parameters in a constitutive model for sintering. While the dilatometer machine is excellent at collecting data, its conditions differ from those in an industrial sintering oven. Therefore, the constitutive model must be robust. Different sintering time cycles have been used to optimize the adjustable parameters in the model. The initial density has also been investigated to better understand the sintering process. This is important since the relative density in the green body after compaction may vary. Before the particles start to sinter, during the debinding process, densification can be detected, which is dependent on the initial density. The constitutive model for sintering was improved to include this phenomenon by adding particle rearrangement based on the theoretical packing of spheres.