Hong, T.-W. Lee, S.-I. Shim, J.-H. Lee, J. Lee, M.-G. Hwang, B. 2024-01-19T21:34:37Z 2024-01-19T21:34:37Z 2021-09-02 2018-10 1225-0562 https://pubs.kist.re.kr/handle/201004/120883 This study examines the effect of microstructural factors on the strength and deformability of ferrite-pearlite steels. Six kinds of ferrite-pearlite steel specimens are fabricated with the addition of different amounst of Mn and V and with varying the isothermal transformation temperature. The Mn steel specimen with a highest Mn content has the highest pearlite volume fraction because Mn addition inhibits the formation of ferrite. The V steel specimen with a highest V content has the finest ferrite grain size and lowest pearlite volume fraction because a large amount of ferrite forms in fine austenite grain boundaries that are generated by the pinning effect of many VC precipitates. On the other hand, the room-temperature tensile test results show that the V steel specimen has a longer yield point elongation than other specimens due to the highest ferrite volume fraction. The V specimen has the highest yield strength because of a larger amount of VC precipitates and grain refinement strengthening, while the Mn specimen has the highest tensile strength because the highest pearlite volume fraction largely enhances work hardening. Furthermore, the tensile strength increases with a higher transformation temperature because increasing the precipitate fraction with a higher transformation temperature improves work hardening. The results reveal that an increasing transformation temperature decreases the yield ratio. Meanwhile, the yield ratio decreases with an increasing ferrite grain size because ferrite grain size refinement largely increases the yield strength. However, the uniform elongation shows no significant changes of the microstructural factors. ？ Materials Research Society of Korea. Korean Korea Federation of Science and Technology Deformation Ferrite Formability Grain boundaries Grain refinement Grain size and shape Pearlite Pearlitic transformations Steel Steel research Strain hardening Tensile testing Volume fraction Yield stress Austenite grain boundaries Ferrite-pearlite Grain refinement strengthening Isothermal transformations Microstructural factors Strength Transformation temperatures Yield point elongations Tensile strength Effect of microstructural factors on the strength and deformability of ferrite-pearlite steels with different Mn and V contents [Mn 및 V 함량이 다른 페라이트-펄라이트 조직강의 강도와 변형능에 미치는 미세조직 인자의 영향] Article 10.3740/MRSK.2018.28.10.570 1 Korean Journal of Materials Research, v.28, no.10, pp.570 - 577 Korean Journal of Materials Research 28 10 570 577 scopus kci ART002400150 2-s2.0-85059201023 Article Deformation Ferrite Formability Grain boundaries Grain refinement Grain size and shape Pearlite Pearlitic transformations Steel Steel research Strain hardening Tensile testing Volume fraction Yield stress Austenite grain boundaries Ferrite-pearlite Grain refinement strengthening Isothermal transformations Microstructural factors Strength Transformation temperatures Yield point elongations Tensile strength Deformability Ferrite-pearlite Microstructural factor Steel Strength