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Localized Deformation in Multiphase, Ultra-Fine-Grained 6 Pct Mn Transformation-Induced Plasticity Steel

  • Symposium: Austenite Formation and Decomposition IV
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Abstract

Multiphase, ultra-fine-grained transformation-induced plasticity (MP UFG TRIP) steel containing 6 mass pct Mn was obtained by cold rolling and intercritical annealing of an initially fully martensitic microstructure. UFG microstructures with an average grain size less than 300 nm were obtained. The amount of austenite in the microstructures, speculated to be formed by diffusionless transformation, was controlled by changing the intercritical temperature. The tensile properties were strongly influenced by the volume amount and the stability of the reversely transformed austenite. The MP UFG TRIP steel was characterized by pronounced localization of the deformation. The deformation band properties were analyzed in detail.

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Acknowledgments

The authors gratefully acknowledge the support of POSCO. In addition, the authors thank Taejin Song, Dongwhi Kim, Chen Lei, and Jinkyung Kim for their assistance with the experiments. This research was supported by WCU (World Class University) program through the National Research Foundation of Korea funded by the Ministry of Education, Science and Technology (R32-10147).

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Authors and Affiliations

  1. Graduate Institute of Ferrous Technology, POSTECH, Pohang, 790-784, South Korea

    Seawoong Lee (Master Student), Seok-Jae Lee (Research Professor), S. Santhosh Kumar (Postdoctoral Researcher) & B. C. De Cooman (Professor)

  2. POSCO Technical Research Laboratories, Gwangyang, 545-711, South Korea

    Kyooyoung Lee (Researcher)

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  1. Seawoong Lee
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  2. Seok-Jae Lee
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  3. S. Santhosh Kumar
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  4. Kyooyoung Lee
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  5. B. C. De Cooman
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Correspondence to B. C. De Cooman.

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Manuscript submitted June 10, 2010.

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Lee, S., Lee, SJ., Santhosh Kumar, S. et al. Localized Deformation in Multiphase, Ultra-Fine-Grained 6 Pct Mn Transformation-Induced Plasticity Steel. Metall Mater Trans A 42, 3638–3651 (2011). https://doi.org/10.1007/s11661-011-0636-9

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