Microstructure analysis of martensitic low alloy carbon steel samples subjected to deformation dilatometry

Document identifier: oai:DiVA.org:ltu-76605
Access full text here:10.1016/j.matchar.2019.109926
Keyword: Engineering and Technology, Materials Engineering, Metallurgy and Metallic Materials, Teknik och teknologier, Materialteknik, Metallurgi och metalliska material, Dilatometry, Koistinen-marburger, Martensite, Phase transformation, EBSD, Engineering Materials
Publication year: 2019
Abstract:

Low alloy martensitic steels are commonly used in structural and wear resistant applications due to their excellent mechanical properties and abrasion resistance. Martensite phase is generally achieved by rapid cooling, and prior deformation in the austenite region also affects the martensite transformation. It is important to understand the martensite transformation when there is deformation above Ae3. Deformation and quenching simulations have been performed using dilatometry on a low alloy carbon steel. The aim was to determine the influence of deformation above Ae3 (prior deformation) on, firstly, the austenite grain size and shape, and secondly, the martensitic microstructure and variant selection. In addition, the hardness of the martensitic structure due to prior deformation has been investigated. The experimental results obtained from electron backscatter diffraction and microhardness tests on the deformation dilatometry test samples were analysed. The orientation relationship Kurdjumov-Sachs has been used to analyse the martensitic variants. The results revealed a deeper understanding of prior austenite grain structure's effect on the martensitic transformation kinetics and its morphology. The martensite laths' misorientation interval 15–48° were used to visualise the prior austenite grain size. The martensitic lath structure is more refined due to increased prior deformation. Shorter martensite formation time promotes a single dominating packet within the prior austenite grain.

Authors

Jessica Gyhlesten Back

Other publications >>

Kumar Surreddi

Materials Technology, Dalarna University, Falun, Sweden
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    header: 
        identifier: oai:DiVA.org:ltu-76605
        datestamp: 2021-04-19T12:36:16Z
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                version: 3.7
            recordInfo: 
                recordContentSource: ltu
                recordCreationDate: 2019-11-04
            identifier: 
                http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-76605
                10.1016/j.matchar.2019.109926
            titleInfo: 
                @attributes: 
                    lang: eng
                title: Microstructure analysis of martensitic low alloy carbon steel samples subjected to deformation dilatometry
            abstract: 
Low alloy martensitic steels are commonly used in structural and wear resistant applications due to their excellent mechanical properties and abrasion resistance. Martensite phase is generally achieved by rapid cooling and prior deformation in the austenite region also affects the martensite transformation. It is important to understand the martensite transformation when there is deformation above Ae3. Deformation and quenching simulations have been performed using dilatometry on a low alloy carbon steel. The aim was to determine the influence of deformation above Ae3 (prior deformation) on firstly the austenite grain size and shape and secondly the martensitic microstructure and variant selection. In addition the hardness of the martensitic structure due to prior deformation has been investigated. The experimental results obtained from electron backscatter diffraction and microhardness tests on the deformation dilatometry test samples were analysed. The orientation relationship Kurdjumov-Sachs has been used to analyse the martensitic variants. The results revealed a deeper understanding of prior austenite grain structure's effect on the martensitic transformation kinetics and its morphology. The martensite laths' misorientation interval 15–48° were used to visualise the prior austenite grain size. The martensitic lath structure is more refined due to increased prior deformation. Shorter martensite formation time promotes a single dominating packet within the prior austenite grain.

            subject: 
                    @attributes: 
                        lang: eng
                        authority: uka.se
                    topic: 
                        Engineering and Technology
                        Materials Engineering
                        Metallurgy and Metallic Materials
                    @attributes: 
                        lang: swe
                        authority: uka.se
                    topic: 
                        Teknik och teknologier
                        Materialteknik
                        Metallurgi och metalliska material
                    @attributes: 
                        lang: eng
                    topic: Dilatometry
                    @attributes: 
                        lang: eng
                    topic: Koistinen-marburger
                    @attributes: 
                        lang: eng
                    topic: Martensite
                    @attributes: 
                        lang: eng
                    topic: Phase transformation
                    @attributes: 
                        lang: eng
                    topic: EBSD
                    @attributes: 
                        lang: eng
                        authority: ltu
                    topic: Engineering Materials
                    genre: Research subject
                    @attributes: 
                        lang: swe
                        authority: ltu
                    topic: Materialteknik
                    genre: Research subject
            language: 
                languageTerm: eng
            genre: 
                publication/journal-article
                ref
            note: 
                Published
                2
            name: 
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                        type: personal
                        authority: ltu
                    namePart: 
                        Gyhlesten Back
                        Jessica
                    role: 
                        roleTerm: aut
                    nameIdentifier: jesgyh
                    @attributes: 
                        type: personal
                    namePart: 
                        Surreddi
                        Kumar
                    role: 
                        roleTerm: aut
                    affiliation: Materials Technology Dalarna University Falun Sweden
            originInfo: 
                dateIssued: 2019
                publisher: Elsevier
            relatedItem: 
                @attributes: 
                    type: host
                titleInfo: 
                    title: Materials Characterization
                identifier: 
                    1044-5803
                    1873-4189
                part: 
                    detail: 
                            @attributes: 
                                type: volume
                            number: 157
                            @attributes: 
                                type: artNo
                            number: 109926
            location: 
                    url: https://doi.org/10.1016/j.matchar.2019.109926
                    url: http://ltu.diva-portal.org/smash/get/diva2:1367643/FULLTEXT01.pdf
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                gratis
                gratis
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                form: electronic
            typeOfResource: text