Relaxation of residual stresses and grain boundary fracture in 316H stainless steel (Keynote paper)

PEJ Flewitt, B Chen, DJ Smith

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

Abstract

This paper reviews factors that contribute to stress relief and reheat cracking in weldments. In particular we consider the influence of thermo-mechanical history on the relaxation of triaxial residual stresses, typical of those observed in the 316H austenitic stainless steel thick section attachment welds. 316H austenitic stainless steel parent material has been subject variously to thermo-mechanical pre-treatments and a critical microstructure encountered within the heat affected zone of the thick section weldments has been simulated. Through thickness residual stress fields induced by a spray water quenching technique and their relaxation as a result of high temperature exposure have been characterised using neutron diffraction. The rates of relaxation are correlated with microstructure. The susceptibility of grain boundary to brittle fracture at a temperature of -196°C is shown to be a function of inter-granular M23C6 carbides and phosphorous segregation at grain boundaries. The influences of the thermo-mechanical history on creep deformation resistance and the potential susceptibility to grain boundary creep cavitation are discussed.
Translated title of the contributionRelaxation of residual stresses and grain boundary fracture in 316H stainless steel (Keynote paper)
Original languageEnglish
Title of host publicationInternational Symposium on Structural Integrity, Shanghai
EditorsShan-Tung Tu, Zhengdong Wang, George C Sih
PublisherEast China University of Science and Technology Press
Pages41 - 50
Number of pages10
Publication statusPublished - 2010

Bibliographical note

Conference Proceedings/Title of Journal: Proceedings of 2010 International Symposium on Structural Integrity: Structural Integrity and Materials Ageing in Extreme Conditions

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    Flewitt, PEJ., Chen, B., & Smith, DJ. (2010). Relaxation of residual stresses and grain boundary fracture in 316H stainless steel (Keynote paper). In S-T. Tu, Z. Wang, & G. C. Sih (Eds.), International Symposium on Structural Integrity, Shanghai (pp. 41 - 50). East China University of Science and Technology Press.