Damage Model Determination for Predicting Creep Rupture Time of 2 1/4Cr–1Mo Steel Weld Joints

In a creep damage analysis for weld joint (WJ) using model, it is important to select model that properly reflects complex conditions of stress generated in the interface between base metal and heat-affected zone (HAZ). For 2 1/4Cr–1Mo steel, we examined what type scalar appropriate around HAZ accurately predicting rupture time, framework time exhaustion rule, which evaluates as function stress. specimen round rod WJ through an penetrates obliquely, compared actual tests finite element method (FEM) analysis, temperature-stress ranges from 120 160 MPa at 823 K, 80 100 873 K. Using FEM calculations, evaluated based on considering three types stress: maximum principal stress, equivalent Huddleston Comparing with tests, found gives this accumulation due deformation (BM)-HAZ cavity formation hydrostatic pressure are taken into account. Analyses distribution inside outside BM-HAZ indicated that, tensile also when evaluate damage. We optimized parameter b, regulates balance so observed results reproduced determination coefficient R2 = 0.948, obtained value b 0.34.