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Investigation of stress relaxation mechanisms for ductility improvement in SS316L
journal contribution
posted on 2018-01-01, 00:00 authored by A Varma, A Gokhale, J Jain, K Hariharan, Pavel CizekPavel Cizek, Matthew BarnettMatthew BarnettStress relaxation during plastic deformation has been reported to improve ductility and alter the mechanical properties of metallic materials. The aim of the present study is to investigate the role of various mechanisms responsible for this in stainless steel SS 316L. The fractography of the tested samples is analysed using an image analyser and the void fraction at failure is correlated with the corresponding mechanisms. The parametric studies on stress relaxation at different pre-strain and relaxation time correlate well with the fractography results supporting the proposed mechanisms. TEM investigation of dislocation structures and void characterisation further confirm the role of dislocation annihilation. Moreover, a novel indentation technique combining micro- and nano-indentation techniques is used to verify the role of stress homogenisation mechanism.
History
Journal
Philosophical magazineVolume
98Issue
3Pagination
165 - 181Publisher
Taylor & FrancisLocation
Abingdon, Eng.Publisher DOI
ISSN
1478-6435eISSN
1478-6443Language
engPublication classification
C1 Refereed article in a scholarly journalCopyright notice
2017, Informa UK Limited, trading as Taylor & Francis GroupUsage metrics
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Categories
Keywords
stress relaxationfractographynano-indentationScience & TechnologyTechnologyPhysical SciencesMaterials Science, MultidisciplinaryMetallurgy & Metallurgical EngineeringPhysics, AppliedPhysics, Condensed MatterMaterials SciencePhysicsSTRAIN DISTRIBUTIONDEFORMATIONSTEELFRACTURENANOINDENTATIONTEMPERATUREFORMABILITYBEHAVIORHARDNESSTENSION