PSI - Issue 2_A

L. Esposito et al. / Procedia Structural Integrity 2 (2016) 927–933 L. Esposito et al./ Structural Integrity Procedia 00 (2016) 000–000

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independent values of the activation energy. An activation energy for diffusive processes equal to 140kJ/mol appears adequate, while a dislocational activation energy about three times bigger is needed. The comparison between model prediction and experimental data is given in figure 5.

a)

b)

Fig. 4: Aggregated data plot of the minimum creep rate after normalization by the activation energy.

Table 1: Model parameters for AISI 316H. 0 A [h -1 ] Q  [J/mol] th 

0 B [h

0  [MPa]

d Q [J/mol]

 [MPa] 

-1 ] 

m 

8.7267E+13

431250

0.112

6.1

1

140000



Fig. 5: Model prediction of the AISI 316H minimum creep rate on wide stress range.