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Influence of Intra-granular Ferrite on the Tensile Behavior of Intercritically Annealed 12 pct Mn TWIP+TRIP Steel

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Abstract

The influence of intra-granular ferrite islands, fully embedded in austenite matrix grains, on the tensile behavior of intercritically annealed Fe-12 pct Mn-0.3 pctC-3 pctAl TWIP+TRIP steel was investigated. The presence of intra-granular ferrite, which nucleated at twin boundaries during annealing, resulted in an increased yield strength by the Orowan dislocation looping mechanism and the generation of geometrically necessary dislocations at the ferrite particle/austenite matrix interface. The intra-granular ferrite also induced the formation of secondary twin variants. The resulting twin–twin intersections nucleated additional α′-martensite, thereby leading to an enhanced TRIP effect.

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Authors and Affiliations

  1. Graduate Institute of Ferrous Technology, Pohang University of Science and Technology, Pohang, 790-784, Republic of Korea

    Sangwon Lee (Graduate Students) & Bruno C. De Cooman (Professor, Director)

  2. Materials Design Laboratory, Pohang University of Science and Technology, Pohang, 790-784, Republic of Korea

    Bruno C. De Cooman (Professor, Director)

Authors
  1. Sangwon Lee
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  2. Bruno C. De Cooman
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Correspondence to Bruno C. De Cooman.

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Manuscript submitted July 10, 2014.

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Lee, S., De Cooman, B.C. Influence of Intra-granular Ferrite on the Tensile Behavior of Intercritically Annealed 12 pct Mn TWIP+TRIP Steel. Metall Mater Trans A 46, 1012–1018 (2015). https://doi.org/10.1007/s11661-014-2710-6

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