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Strain localization and crack formation effects on stress-strain response of ductile iron
School of Engineering, Jönköping University, Sweden.
School of Engineering, Jönköping University, Sweden.
School of Engineering, Jönköping University, Sweden.ORCID iD: 0000-0003-0899-8939
School of Mechanical and Aerospace Engineering, Nanyang Technological University, Singapore.
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2017 (English)In: Materials Science & Engineering: A, ISSN 0921-5093, E-ISSN 1873-4936, Vol. 702, p. 265-271Article in journal (Refereed) Published
Abstract [en]

The strain localization and crack formation in ferritic-pearlitic ductile iron under tension was investigated by in-situ tensile tests. In-situ tensile tests under optical microscope were performed and the onset of the early ferrite-graphite decohesions and micro-cracks inside the matrix were studied. The results revealed that early ferrite-graphite decohesion and micro-cracks inside the ferrite were formed at the stress range of 280–330 MPa, where a kink occurred in the stress-strain response, suggesting the dissipation of energy in both plastic deformation and crack initiation. Some micro-cracks initiated and propagated inside the ferrite but were arrested within the ferrite zone before propagating in the pearlite. Digital Image Correlation (DIC) was used to measure local strains in the deformed micrographs obtained from the in-situ tensile test. Higher strain localization in the microstructure was measured for the areas in which the early ferrite-graphite decohesions occurred or the micro-cracks initiated. © 2017 Elsevier B.V.

Place, publisher, year, edition, pages
Elsevier, 2017. Vol. 702, p. 265-271
Keywords [en]
Cracking, Digital image correlation, Graphite-matrix decohesion, In-situ tensile test, Micro-crack, Crack initiation, Ductility, Ferrite, Ferritic steel, Graphite, Image analysis, Pearlite, Strain, Strain measurement, Tensile testing, D. digital image correlation (DIC), De-cohesion, Digital image correlations, Local strains, Strain localizations, Stress range, Stress-strain response, Cracks
National Category
Metallurgy and Metallic Materials
Identifiers
URN: urn:nbn:se:his:diva-19180DOI: 10.1016/j.msea.2017.07.018ISI: 000407983500030Scopus ID: 2-s2.0-85024504785OAI: oai:DiVA.org:his-19180DiVA, id: diva2:1476337
Note

Correspondence Address: Kasvayee, K.A.; School of Engineering, Jönköping University, Box 1026, Sweden; email: Keivan.Amiri-Kasvayee@ju.se

Available from: 2020-10-14 Created: 2020-10-14 Last updated: 2020-10-14Bibliographically approved

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