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Effect of Holding Temperature on Microstructure and Mechanical Properties of High-Strength Multiphase Steel
KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap, Metallografi.ORCID-id: 0000-0003-4825-7430
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2016 (engelsk)Inngår i: Steel Research International, ISSN 1611-3683, E-ISSN 1869-344X, Vol. 87, nr 9, s. 1203-1212Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Isothermal holding following intercritical annealing is usually used in microstructure control, e.g., fractions and stabilities of retained-austenite (RA). Fe–0.22C–2.5Mn–0.47Si–0.41Cr–0.02Nb (mass%) steel is subjected to intercritical annealing and isothermal treatment at 250, 300, 350, and 400 °C to elucidate the impact on microstructures and mechanical properties by means of electron microscopy and uniaxial tensile test, respectively. The results show that the isothermal holding temperature is vital for the formed phases, including the morphology, volume fraction, and carbon content of RA in the processed steels. The tensile test results indicate that the mechanical properties including Ultra-tensile strength (UTS), Yield strength (YS), as well as Total Elongation (TEL) are attributed to the synthetic action of all constituents of phase morphology and corresponding fractions, e.g., hard-to-soft phase ratio, morphology and fraction of RA, dispersed precipitates. An excellent combination of strength–ductility of the present multiphase steel has been explained in terms of their specific microstructure.

sted, utgiver, år, opplag, sider
Wiley-VCH Verlagsgesellschaft, 2016. Vol. 87, nr 9, s. 1203-1212
Emneord [en]
holding temperatures, martensite, microstructures, multiphase steels, retained-austenite, Austenite, Carbon, Isothermal annealing, Isotherms, Martensitic steel, Mechanical properties, Microstructure, Morphology, Tensile strength, Tensile testing, Intercritical annealing, Isothermal holding temperature, Microstructure and mechanical properties, Microstructure control, Microstructures and mechanical properties, Multi-phase steels, Retained austenite, High strength steel
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Identifikatorer
URN: urn:nbn:se:kth:diva-194907DOI: 10.1002/srin.201500331ISI: 000387015500008Scopus ID: 2-s2.0-84985029761OAI: oai:DiVA.org:kth-194907DiVA, id: diva2:1052879
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QC 20161207

Tilgjengelig fra: 2016-12-07 Laget: 2016-11-01 Sist oppdatert: 2017-11-29bibliografisk kontrollert

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