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Optimizing the Morphology and Stability of Retained Austenite in a δ-TRIP Steel

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Abstract

δ-TRIP is a low-alloy steel in which ferrite persists at all temperatures in the solid-state, with the remaining microstructure consisting of carbide-free bainite and carbon-enriched retained austenite. The present work explores for the first time, how changes in the intercritical annealing temperature and the transformation conditions associated with bainite influence the morphology and stability of the austenite, and hence the behavior of the microstructure during tensile deformation. It is found that the structure can be optimized to consist of a combination of blocky and film austenite that undergo transformation over a range of plastic strains, thus minimizing the possibility of plastic instabilities, and hence imparting considerable strength and uniform elongation.

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Acknowledgments

We are grateful to the laboratory facilities support at GIFT, and to POSCO for the Steel Innovation Programme. In addition, this work is partially supported by the National Natural Science Foundation of China (Grant No. 51204051) and the Fundamental Research Funds for the Central Universities (Grant Nos. N120507001 and N120607001).

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Authors and Affiliations

  1. State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang, 110189, P. R. China

    H. L. Yi (Associate Professor) & P. Chen (Ph.D. Student)

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

    H. K. D. H. Bhadeshia (Professor)

Authors
  1. H. L. Yi
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  2. P. Chen
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  3. H. K. D. H. Bhadeshia
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Correspondence to H. L. Yi.

Additional information

Manuscript submitted July 12, 2013.

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Yi, H.L., Chen, P. & Bhadeshia, H.K.D.H. Optimizing the Morphology and Stability of Retained Austenite in a δ-TRIP Steel. Metall Mater Trans A 45, 3512–3518 (2014). https://doi.org/10.1007/s11661-014-2267-4

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