Finite element modelling of the creep deformation of T91 steel weldments at 600°C

Abstract

Finite element modelling of the creep deformation of T91 steel weldments, welded using the manual metal arc (MMA) and submerged arc (SA) welding processes, was carried out to predict creep curves for both of the weldments under different stresses and compared with the experimental data. The stress and strain redistribution across the length of the transverse‐weld specimens has also been predicted. Data of creep tests at 600°C at stresses between 90‐130 MPa for the base metal, the MMA and SA weld metals, and the simulated heat‐affected zone were used to determine Garofalo's equation for creep strain. Finite element meshes for both of the weldments were constructed after calculating the HAZ locations using Rosenthal's heat flow equation.