Investigation on creep rupture behavior of SA387Gr91 steel welded joint

Abstract

The high temperature creep rupture behavior of SA387Gr91 martensitic heat-resistant steel welded joint was studied in this paper. Accelerated creep tests were carried out at 545°C and 565°C and stresses ranging from 175 to 225Mpa. The creep test curves of SA387Gr91 martensitic heat-resistant steel welded joint were obtained. Microstructures of SA387Gr91 martensitic heat-resistant steel welded joint after creep and fractographs were analyzed by scanning electron microscope and optical microscope. From the macroscopic fracture morphology of the specimen after creep test, it can be seen that the fracture position is in the heat affected zone. The values of reduction in area range from 82.12% to 87.57%.