Creep relaxation of residual stresses in the heat affected zone of Type 316H austenitic stainless steel weldments

B Chen, PEJ Flewitt, DJ Smith

Research output: Chapter in Book/Report/Conference proceedingConference Contribution (Conference Proceeding)

1 Citation (Scopus)

Abstract

The present work extends the understanding of the role of thermo-mechanical history on the relaxation of residual stresses. Different thermo-mechanical pre-treatments have been developed and applied to an ex-service Type 316H austenitic stainless steel to produce both microstructures and residual macro-stresses typical of those in the heat affected zone (HAZ) of thick section attachment weldments, where reheat cracking has been observed during high temperature service (~550℃). The microstructures have been characterised after each step of pre-treatment. The through section residual macro-stresses have been measured by neutron diffraction. For the range of thermo-mechanical pre-treatments adopted, the relaxation of the initial residual macro-stresses have been measured following thermal exposure at a temperature of 550°C for times of 1h and 1800h. The results are discussed, based on the relaxation characteristics of the residual macro-stresses, in terms of the role of initial microstructure on the creep deformation behaviour and the susceptibility to the service reheat cracking.
Translated title of the contributionCreep relaxation of residual stresses in the heat affected zone of Type 316H austenitic stainless steel weldments
Original languageEnglish
Title of host publicationEuropean Conference on Fracture 18, Dresden
Publication statusPublished - 2010

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