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Low-carbon cast mic...
Low-carbon cast microalloyed steel intercritically heat-treated at different temperatures : microstructure and mechanical properties
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- Torkamani, Hadi (författare)
- Luleå tekniska universitet,Materialvetenskap,School of Metallurgy and Materials Engineering, College of Engineering, University of Tehran, P.O. Box 11155-4563, Tehran, Iran
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- Raygan, Shahram (författare)
- School of Metallurgy and Materials Engineering, College of Engineering, University of Tehran, P.O. Box 11155-4563, Tehran, Iran
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- Mateo, Carlos Garcia (författare)
- Materalia Research Group, National Center for Metallurgical Research (CENIM), Consejo Superior de Investigaciones Cientificas (CSIC), Avda Gregorio del Amo, 8, 28040, Madrid, Spain
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- Palizdar, Yahya (författare)
- Materials and Energy Research Center, 3177983634, Karaj, Iran
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- Rassizadehghani, Jafar (författare)
- School of Metallurgy and Materials Engineering, College of Engineering, University of Tehran, P.O. Box 11155-4563, Tehran, Iran
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- Vivas, Javier (författare)
- Materalia Research Group, National Center for Metallurgical Research (CENIM), Consejo Superior de Investigaciones Cientificas (CSIC), Avda Gregorio del Amo, 8, 28040, Madrid, Spain; Lortek, Arranomendia Kalea 4A, 20240, Ordizia, Gipozkoa, Spain
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- San-Martin, David (författare)
- Materalia Research Group, National Center for Metallurgical Research (CENIM), Consejo Superior de Investigaciones Cientificas (CSIC), Avda Gregorio del Amo, 8, 28040, Madrid, Spain
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(creator_code:org_t)
- 2021-04-17
- 2021
- Engelska.
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Ingår i: Archives of Civil and Mechanical Engineering. - : Springer. - 1644-9665. ; 21:2
- Relaterad länk:
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https://doi.org/10.1...
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https://link.springe...
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- In this study, dual-phase (DP, ferrite + martensite) microstructures were obtained by performing intercritical heat treatments (IHT) at 750 and 800 °C followed by quenching. Decreasing the IHT temperature from 800 to 750 °C leads to: (i) a decrease in the volume fraction of austenite (martensite after quenching) from 0.68 to 0.36; (ii) ~ 100 °C decrease in martensite start temperature (Ms), mainly due to the higher carbon content of austenite and its smaller grains at 750 °C; (iii) a reduction in the block size of martensite from 1.9 to 1.2 μm as measured by EBSD. Having a higher carbon content and a finer block size, the localized microhardness of martensite islands increases from 380 HV (800 °C) to 504 HV (750 °C). Moreover, despite the different volume fractions of martensite obtained in DP microstructures, the hardness of the steels remained unchanged by changing the IHT temperature (~ 234 to 238 HV). Applying lower IHT temperature (lower fraction of martensite), the impact energy even decreased from 12 to 9 J due to the brittleness of the martensite phase. The results of the tensile tests indicate that by increasing the IHT temperature, the yield and ultimate tensile strengths of the DP steel increase from 493 to 770 MPa, and from 908 to 1080 MPa, respectively, while the total elongation decreases from 9.8 to 4.5%. In contrast to the normalized sample, formation of martensite in the DP steels could eliminate the yield point phenomenon in the tensile curves, as it generates free dislocations in adjacent ferrite.
Ämnesord
- TEKNIK OCH TEKNOLOGIER -- Materialteknik -- Metallurgi och metalliska material (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Materials Engineering -- Metallurgy and Metallic Materials (hsv//eng)
Nyckelord
- Austenite
- Dual phase steel
- Ferrite
- Fracture mechanics
- Martensite
- Microalloyed steel
- Microalloying
- Microstructure
- Quenching
- Tensile strength
- Tensile testing
- Volume fraction
- Carbon content
- Impact energy
- Intercritical heat treatment
- Martensite phase
- Martensite start temperature
- Microstructure and mechanical properties
- Total elongations
- Ultimate tensile strength
- Low carbon steel
- Materialteknik
- Engineering Materials
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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