Abstract
In this study, creep properties and fracture behaviors ranging from 400 to 450 N in small punch creep (SPC) tests at 700 °C and 725 °C were evaluated by experiment and simulation for Sanicro25 alloy. The similar creep performances were obtained experimentally in both SPC tests and uniaxial creep (UC) tests, and the correlation between loads in SPC tests and stresses in UC tests at different temperatures was determined. In addition, different crack growth patterns which gradually changed from intergranular fracture (IF) to combined model of IF and transgranular fracture (TF), and finally TF was found. Based on specimen geometrical deformation, a modified cone model was proposed, which considered the effect of various thicknesses in different deformation regions. Then, a reasonable and feasible SPC creep strain model was developed to describe the strain as a function of time. According to the proposed model, Monkman-Grant (MG) relationship and modified MG relationship in SPC tests were evaluated. Compared with UC tests, the rupture creep strain played an important role in analyzing of the creep properties in SPC tests.
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