Influence of alloy type, peak temperature and constraint on residual stress evolution in Satoh test

Abstract

The evolution of residual stress in welds is affected by a variety of factors such as joint design, welding parameters, material properties and the possible presence of phase transformations. The Satoh test can be useful as a method to understand differences in welding residual stresses among various materials. This study compares the evolution of residual stress measured in the Satoh test for ferritic and stainless steels. For weld thermal cycles with a peak temperature above Ac 3 , the ferritic alloys exhibit lower residual stresses than the austenitic alloys due to the well known reduction in stress from the martensitic or bainitic transformation. However, the residual stress levels among these alloys are similar for peak temperatures below Ac 3 . The application of constraint during both the heating and cooling portions of the thermal cycle affects the final magnitude of residual stress in a way that is not often considered.

Residual stress and distortion in thick-plate weld joint of AF1410 steel: finite element simulations and experimental studies

“…Although the martensite has a high yield strength, the final residual stress is only around 200 MPa. The stress evolution of 1st thermal cycle is a typical curve with martensitic transformation [37]. The 2nd thermal cycle has a similar variation to the 1st thermal cycle.…”