Stress relaxation cracking susceptibility evaluation in 347H stainless steel welds

Pickle, Timothy; Hong, Yu; Vidal, Judith; Augustine, Chad; Yu, Zhenzhen

doi:10.1007/s40194-024-01678-9

Stress relaxation cracking susceptibility evaluation in 347H stainless steel welds

Journal Article · Thu Jan 25 00:00:00 EST 2024 · Welding in the World

DOI:https://doi.org/10.1007/s40194-024-01678-9· OSTI ID:2282824

Pickle, Timothy; Hong, Yu; Vidal, Judith; Augustine, Chad;

Abstract

Stress relaxation cracking (SRC) has been reported as a dominant failure mechanism for 347H stainless steel welds at elevated service temperatures, occurring in either the heat-affected zone (HAZ) or fusion zone (FZ). In this study, SRC susceptibility of physically simulated HAZ and cross-welded E347-347H stainless steel welds was studied using a four-step accelerated SRC test with a thermomechanical physical simulator. The stress and temperature range studied represents weld-induced residual stress at 150–600 MPa and post-weld heat treatment temperatures between 800 and 1050 °C. For all temperature conditions, the cross-welded samples failed at a lower critical stress threshold than the simulated HAZ. A finite element model of a 50.8-mm-thick single-V groove weld was used to generate the residual stress maps induced by a 40-pass welding procedure, which in combination with the experimental threshold stress map predicted potential SRC failure locations. Postmortem microstructural evaluations were performed to identify contributing characteristics to SRC. It was found that HAZ samples exhibited a combination of creep void development, secondary cracks with intergranular fracture near grain boundary carbides, and eutectic phases. FZ samples showed brittle fracture with cracks propagating along straight, non-tortuous interdendritic grain boundaries.

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Research Organization:: National Renewable Energy Laboratory (NREL), Golden, CO (United States)

Sponsoring Organization:: USDOE; USDOE Office of Energy Efficiency and Renewable Energy (EERE), Renewable Power Office. Solar Energy Technologies Office

Grant/Contract Number:: AC36-08GO28308

OSTI ID:: 2282824

Alternate ID(s):: OSTI ID: 2311877

Report Number(s):: NREL/JA--5500-87270; PII: 1678

Journal Information:: Welding in the World, Journal Name: Welding in the World Journal Issue: 3 Vol. 68; ISSN 0043-2288

Publisher:: Springer Science + Business MediaCopyright Statement

Country of Publication:: United Kingdom

Language:: English

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Stress relaxation cracking susceptibility evaluation in 347H stainless steel welds

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