A Numerical Modelling Approach for Time-Dependent Deformation of Hot Forming Tools under the Creep-Fatigue Regime

Table 2

Optimized values of the coefficients in (1) on the basis of experimental data for creep, fatigue, and creep-fatigue conditions.

(a)

Creep
	380 [°C]	490 [°C]	540 [°C]	580 [°C]
400 [MPa]	7.00E − 14	1.44E − 08	4.46E − 07	4.00E − 06
600 [MPa]	7.33E − 14	1.44E − 08	4.46E − 07
800 [MPa]	7.33E − 14	1.44E − 08
400 [MPa]	3.97	1.92	1.35	1.06
600 [MPa]	3.70	1.82	1.40
800 [MPa]	3.57	1.82
400 [MPa]	−0.9325	−0.9150	−0.8700	−0.8700
600 [MPa]	−0.9325	−0.9150	−0.8700
800 [MPa]	−0.9325	−0.9150

(b)

Fatigue
	380 [°C]	490 [°C]	540 [°C]	580 [°C]
400 [MPa]	6.00E − 14	1.33E − 8	4.00E − 7	3.00E − 06
600 [MPa]	6.00E − 14	1.33E − 8	4.00E − 7
800 [MPa]	6.00E − 14	1.33E − 8
400 [MPa]	3.96	1.90	1.34	0.99
600 [MPa]	3.74	1.77	1.27
800 [MPa]	3.60	1.74
400 [MPa]	−0.9325	−0.9150	−0.8700	−0.8700
600 [MPa]	−0.9325	−0.9150	−0.8700
800 [MPa]	−0.9325	−0.9150

(c)

Creep-fatigue
	380 [°C]	490 [°C]	540 [°C]	580 [°C]
400 [MPa]	6.40E − 14	1.42E − 8	4.20E − 7	3.80E − 06
600 [MPa]	6.40E − 14	1.42E − 8	4.20E − 7
800 [MPa]	6.40E − 14	1.42E − 8
400 [MPa]	3.97	1.92	1.35	1.05
600 [MPa]	3.72	1.84	1.30
800 [MPa]	3.62	1.83
400 [MPa]	−0.9325	−0.9150	−0.8700	−0.8700
600 [MPa]	−0.9325	−0.9150	−0.8700
800 [MPa]	−0.9325	−0.9150