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Tensile properties of different chemical compositions for TRIP-assisted multiphase steel for automobile structures

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Abstract

The microstructural changes and the tensile properties of TRIP-assisted steels resulting from different chemical compositions were investigated by using SEM, TEM, XRD and UTM. As a result of microscopic observation, the morphology of retained austenite could be characterized by two types: a granular type in steel containing higher Si and a film type in steel having higher C. In the case of the steel containing higher C with a tensile strength of 860 MPa and a total elongation of 38%, the film type retained austenite could be observed among the lath bainitic ferrites. Actually, the metastable retained austenite was required for good formability, which means that the chemical composition plays a significant role in the microstructure and tensile property of TRIP-assisted steel. With respect to the tensile property, each steel type that contained an suitable amount of Si and Mn demonstrated a typical TRIP effect on a stress-strain curve while steel that contained a higher Mn content exhibited similar behaviors, as demonstrated in the dual phase steels.

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  1. Jeonnam Advanced Materials Industrialization Center, Haeryong-myeon, Suncheon-si, Jeonnam, 540-856, Korea

    K. Y. Lee

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  1. K. Y. Lee
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Correspondence to K. Y. Lee.

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Lee, K.Y. Tensile properties of different chemical compositions for TRIP-assisted multiphase steel for automobile structures. Int.J Automot. Technol. 9, 87–93 (2008). https://doi.org/10.1007/s12239-008-0011-z

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  • DOI: https://doi.org/10.1007/s12239-008-0011-z

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