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Effect of Strain-Induced Age Hardening on Yield Strength Improvement in Ferrite-Austenite Duplex Lightweight Steels

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Abstract

Ferrite-austenite lightweight steels showing TRansformation-induced plasticity were developed by varying the aging temperature with or without prestraining, and their effects on tensile properties were investigated in relation with microstructural evolution of carbide formation. The aged steels contained austenite, pearlite, and martensite in the ferrite matrix, and the austenite volume fraction decreased with the increasing aging temperature because some austenite grains decomposed to pearlites. This austenite decomposition to pearlite was favorable for the improvement of yield strength, but negatively influenced overall tensile properties. The prestraining promoted the austenite decomposition by a diffusion-controlled phase transformation, and changed the morphology of the cementite from a long lamellar shape to a densely agglomerated particle shape. In order to obtain the large increase in yield strength as well as excellent combination of strength and ductility, the strain-induced aging treatment, i.e., prestraining followed by aging, is important like in the prestrained and 673 K (400 °C)-aged steel. This large increase in yield strength, in spite of a reduction of elongation (65 to 43 pct), was basically attributed to an appropriate amount of decomposition of austenite to pearlite (e.g., 4 vol pct), while having sufficient austenite to martensite transformation (e.g., 14.5 vol pct martensite).

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Acknowledgments

This work was supported by the Ministry of Knowledge Economy of Korea under a Grant No. 10052826 and BK21 Plus Center for Creative Industrial Materials.

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Authors and Affiliations

  1. Center for Advanced Aerospace Materials, Pohang University of Science and Technology, Pohang, 790-784, Korea

    Hyejin Song (Research Assistant), Seok Gyu Lee (Research Assistant), Seok Su Sohn (Research Assistant Professor) & Sunghak Lee (Professor)

  2. Sheet Products & Process Research Group, Technical Research Laboratories, POSCO, Kwangyang, 545-090, Korea

    Jai-Hyun Kwak (Senior Principal Researcher)

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  1. Hyejin Song
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  2. Seok Gyu Lee
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Correspondence to Seok Su Sohn.

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Manuscript submitted March 16, 2016.

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Song, H., Lee, S.G., Sohn, S.S. et al. Effect of Strain-Induced Age Hardening on Yield Strength Improvement in Ferrite-Austenite Duplex Lightweight Steels. Metall Mater Trans A 47, 5372–5382 (2016). https://doi.org/10.1007/s11661-016-3706-1

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