DOE PAGES title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Probing the Damage Recovery Mechanism in Irradiated Stainless Steels Using In-Situ Microcantilever Bending Test

Journal Article · · Frontiers in Materials

Single crystalline microcantilevers are fabricated from the base metal and heat-affected zone (HAZ) of a laser welded, neutron irradiated austenitic stainless steel, for scanning electron microscope (SEM) in-situ bending. In the HAZ, cantilevers exhibit higher yield point and lower crack tip blunting displacement than in the base metal and unirradiated archive specimen. These results suggest that radiation-induced defects harden the base metal, whereas the HAZ exhibits annealing of defects leading to mechanical softening. Dislocation nucleation ahead of the crack tip is responsible for ductile blunting behavior and provides a pathway to mitigating helium-induced cracking during weld repairs of irradiated materials.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE; USDOE Office of Science (SC)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1845057
Journal Information:
Frontiers in Materials, Journal Name: Frontiers in Materials Vol. 9; ISSN 2296-8016
Publisher:
Frontiers Media SACopyright Statement
Country of Publication:
Switzerland
Language:
English

References (48)

The evolution of mechanical property change in irradiated austenitic stainless steels journal November 1993
Enhanced fracture toughness and strength in bulk nanocrystalline Cu with nanoscale twin bundles journal December 2009
Mechanisms of dislocation multiplication at crack tips journal February 2013
〈c+a〉 Dislocations in deformed Ti–6Al–4V micro-cantilevers journal September 2014
〈a〉 Prismatic, 〈a〉 basal, and 〈c+a〉 slip strengths of commercially pure Zr by micro-cantilever tests journal September 2015
Hydrogen embrittlement revealed via novel in situ fracture experiments using notched micro-cantilever specimens journal January 2018
Fracture behavior of heterogeneous nanostructured 316L austenitic stainless steel with nanotwin bundles journal May 2018
Fracture toughness of NiTi–Towards establishing standard test methods for phase transforming materials journal January 2019
Measurement of swelling-induced residual stress in ion implanted SiC, and its effect on micromechanical properties journal September 2020
A coupled dislocation dynamics-continuum barrier field model with application to irradiated materials journal May 2018
Characteristics of microscopic strain localization in irradiated 316 stainless steels and pure vanadium journal March 2006
Continuum modeling of localized deformation in irradiated bcc materials journal January 2013
Thermal annealing recovery of fracture toughness in HT9 steel after irradiation to high doses journal June 2014
A review of experimental approaches to fracture toughness evaluation at the micro-scale journal July 2019
Determination of true stress-strain curve of type 304 and 316 stainless steels using a typical tensile test and finite element analysis journal February 2021
Enhancing fracture toughness of nanotwinned austenitic steel by thermal annealing journal July 2016
In-situ micro-cantilever bending test in environmental scanning electron microscope: Real time observation of hydrogen enhanced cracking journal January 2017
Fracture properties of a refractory high-entropy alloy: In situ micro-cantilever and atom probe tomography studies journal February 2017
A special coarsening mechanism for intergranular helium bubbles upon heating: A combined experimental and numerical study journal April 2018
Suppression of Localized Plastic Flow in Irradiated Materials journal September 2018
Intrinsic-extrinsic size effect relationship for micromechanical tests journal March 2019
Molecular dynamics simulation of vacancy and void effects on strain-induced martensitic transformations in Fe-50 at.% Ni model concentrated solid solution alloy journal March 2022
Toughness and failure of heat resistant steel before and after hydrogenation journal October 2011
Crack tip strain localisation on mechanics of fracture of heat resistant steel after hydrogenation journal February 2013
Yag laser welding of neutron irradiated stainless steels journal October 1998
Atomistic simulation study of the effect of martensitic transformation volume change on crack-tip material evolution and fracture toughness journal July 1997
Weld Repair of Irradiated Materials journal August 1999
In situ micro-cantilever tests to study fracture properties of NiAl single crystals journal February 2012
A multi-scale correlative investigation of ductile fracture journal May 2017
Re-weldability of neutron irradiated Type 304 and 316L stainless steels journal August 2004
Mechanical properties of weldments using irradiated stainless steel welded by the laser method for ITER blanket replacement journal September 2006
Small-scale characterisation of irradiated nuclear materials: Part II nanoindentation and micro-cantilever testing of ion irradiated nuclear materials journal July 2015
Microstructural characterization and density change of 304 stainless steel reflector blocks after long-term irradiation in EBR-II journal October 2015
Effect of laser welding on deformation mechanisms in irradiated austenitic stainless steel journal January 2020
In situ micromechanical testing of tungsten micro-cantilevers using HR-EBSD for the assessment of deformation evolution journal March 2017
In-situ elastic-plastic fracture mechanics on the microscale by means of continuous dynamical testing journal June 2018
Microstructure and microchemistry of laser welds of irradiated austenitic steels journal August 2021
Interplay of stresses, plasticity at crack tips and small sample dimensions revealed by in-situ microcantilever tests in tungsten journal January 2018
Grain orientation dependence of nanoindentation and deformation-induced martensitic phase transformation in neutron irradiated AISI 304L stainless steel journal March 2019
Small-scale mechanical testing on nuclear materials: bridging the experimental length-scale gap journal January 2018
Role of cavities on deformation-induced martensitic transformation pathways in a laser-welded, neutron irradiated austenitic stainless steel journal March 2020
Weldability of neutron irradiated austenitic stainless steels journal January 1999
Transmission Electron Microscopy of 304-type Stainless Steel after Exposure to Neutron Flux and Irradiation Temperature Gradients journal August 2014
In-situ Micromechanical Testing of Neutron Irradiated FeCrAl Alloys journal July 2020
Multiscale modelling of plastic flow localization in irradiated materials journal August 2000
Chemical heterogeneity enhances hydrogen resistance in high-strength steels journal July 2021
In situ small-scale mechanical testing under extreme environments journal June 2019
Application of STEM characterization for investigating radiation effects in BCC Fe-based alloys journal April 2015