A Characterization for the Deformation Behavior of As-Cast P91 Alloy Steel and Utilization in Hot Extrusion Process

Table 3

Hot extrusion parameters setting for the thermal-mechanical coupled FE model.

Parameter	Content
Billet size (mm)
Initial billet temperature (K)	1533
Initial die temperature (K)	573
Extrusion ratio	9
Extrusion speed (mm/s)	50
Die taper angle (°)	42
Coulomb friction coefficient	0.04
Thermal emissivity of blank	0.7
Environment temperature (K)	293
Heat convection coefficient between billet and extrusion tolls (W·m^−2·K^−1)	1100
Heat convection coefficient between billet and air (W·m^−2·K^−1)	20