Skip to main content
U.S. Department of Energy
Office of Scientific and Technical Information

On residual stress analysis and microstructural evolution for stainless steel type 304 spent nuclear fuel canisters weld joint: Numerical and experimental studies

Journal Article · · Journal of Nuclear Materials
 [1]
  1. Colorado School of Mines, Golden, CO (United States); OSTI
Chloride-induced stress corrosion cracking (CISCC) in the weldments of austenitic stainless steel canisters is one of the primary safety concerns during the dry storage of used nuclear fuel at Independent Spent Fuel Storage Installations in coastal areas. In order to evaluate the CISCC behavior in the canister, a 3D sequentially coupled thermo-mechanical finite element model was built to simulate the residual stresses induced by two intersecting longitudinal and circumferential multi-pass welds in austenitic stainless steel mockup canister. Weld-induced residual stresses from simulation were in good agreement with the experimental measurement results by deep-hole drilling and contour methods. Through-wall high tensile axial and hoop stresses were observed in both the fusion zone and heat affected zone (HAZ) in the longitudinal and circumferential weld, respectively. On the other hand, the microstructure within the weldments of 304 stainless steel mockup was characterized using optical microscopy, scanning electron microscopy, electron back-scattered diffraction and energy dispersive X-ray spectroscopy methods. A few amount of MnS inclusions in both the base metal and HAZ, and a lot of (Mn,Si)xOy inclusions in the fusion zone were found. Meanwhile, there is some α'-martensite in the base metal, while the martensite was reversed in the HAZ. In the fusion zone, there is a lot of δ-ferrite. The martensite reversion phenomenon was also verified by the combination of Feritscope test and thermal simulation, which could predict a martensite reversion temperature as 400C°. The welding residual stresses and microstructure analysis results could offer the instructive information for the prediction of CISCC behavior of the spent nuclear fuel canisters.
Research Organization:
Colorado School of Mines, Golden, CO (United States)
Sponsoring Organization:
USDOE; USDOE Office of Nuclear Energy (NE), Nuclear Energy University Program (NEUP)
Grant/Contract Number:
NE0008442
OSTI ID:
1801224
Alternate ID(s):
OSTI ID: 1608361
Journal Information:
Journal of Nuclear Materials, Journal Name: Journal of Nuclear Materials Vol. 534; ISSN 0022-3115
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

References (27)

Influence of deformation on the transformation of austenitic stainless steels journal September 1985
Laser surface-contouring and spline data-smoothing for residual stress measurement journal April 2004
The effects of deformation induced martensite on the sensitization of austenitic stainless steels journal December 1980
A new finite element model for welding heat sources journal June 1984
Evaluation of Errors Associated with Cutting-Induced Plasticity in Residual Stress Measurements Using the Contour Method journal February 2017
Mitigation of Stress Corrosion Cracking Susceptibility of Machined 304L Stainless Steel Through Laser Peening journal July 2016
A magnetic study of the reversion of martensite α′ in a 304 stainless steel journal July 2000
Numerical simulation of temperature field and residual stress in multi-pass welds in stainless steel pipe and comparison with experimental measurements journal September 2006
The influence of crystallographic orientation distribution on 316LVM stainless steel pitting behavior journal March 2009
The effects of rolling temperature and sensitization treatment on the sulfide stress corrosion cracking of 304L stainless steel journal October 2012
Numerical investigation on residual stress distribution and evolution during multipass narrow gap welding of thick-walled stainless steel pipes journal June 2011
The assessment of residual stresses in welded high strength steel box sections journal September 2012
Effects of strain-induced martensite and its reversion on the magnetic properties of AISI 201 austenitic stainless steel journal December 2016
Stress corrosion cracking of stainless-steel canister for concrete cask storage of spent fuel journal September 2008
Microstructural changes in AISI 304L stainless steel due to surface machining: Effect on its susceptibility to chloride stress corrosion cracking journal August 2010
SCC susceptibility of cold-worked stainless steel with minor element additions journal October 2011
Stress corrosion cracking of austenitic weld deposits in a salt spray environment journal October 2015
Chloride-induced stress corrosion cracking of used nuclear fuel welded stainless steel canisters: A review journal November 2015
Effect of heat input on the microstructure, residual stresses and corrosion resistance of 304L austenitic stainless steel weldments journal July 2014
Microstructure and corrosion behavior of multipass gas tungsten arc welded 304L stainless steel journal March 2014
Effects of low-temperature transformation and transformation-induced plasticity on weld residual stresses: Numerical study and neutron diffraction measurement journal June 2018
Weld residual stresses in a thick plate considering back chipping: Neutron diffraction, contour method and finite element simulation study journal June 2017
Dislocation activities at the martensite phase transformation interface in metastable austenitic stainless steel: An in-situ TEM study journal August 2017
Evaluation method of corrosion lifetime of conventional stainless steel canister under oceanic air environment journal May 2008
Preventing Stress Corrosion Cracking of Spent Nuclear Fuel Dry Storage Canisters journal January 2019
Magnetic measurements of the reverse martensite to austenite transformation in a rolled austenitic stainless steel journal March 2004
Chloride Induced Stress Corrosion Cracking of Type 304 and 304L Stainless Steels in Air journal January 2003