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Effect of Free Surface on the Stability of Individual Retained Austenite Grains in a Duplex Stainless Steel

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Abstract

The present work explored the effect of free surface on the stability of individual austenite grains in a duplex stainless steel. It was found that martensitic transformation took place automatically in the retained austenite grain when a free surface was introduced. This is due to the fact that the martensite nucleation energy barrier can be lowered to a thermally surmountable value as the strain energy induced by martensitic transformation is largely lowered when the matrix constraints were removed.

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Acknowledgments

The authors gratefully acknowledge the expert support given by Mr. Y.F. Chan and Ms. S.L. Wong from the Electron Microscopy Unit of HKU during the execution of the experiments. MH acknowledges the financial support from Research Grants Council of the Hong Kong Special Administration Region, China (Project No. HKU 719712E, HKU712713E), University Research Committee of HKU (Project No. 201211159046) and NSFC (Project No. 51301148).

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Authors and Affiliations

  1. Department of Mechanical Engineering, The University of Hong Kong, Pokfulam Road, Hong Kong, P. R. China

    B. B. He (PhD Candidate), M. X. Huang (Assistant Professor) & A. H. W. Ngan (Professor)

  2. Faculty of Aerospace Engineering, Delft University of Technology, Kluijverweg 1, 2629, HS, Delft, The Netherlands

    S. van der Zwaag (Professor)

Authors
  1. B. B. He
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  2. M. X. Huang
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  3. A. H. W. Ngan
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  4. S. van der Zwaag
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Correspondence to M. X. Huang.

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Manuscript submitted January 22, 2014.

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He, B.B., Huang, M.X., Ngan, A.H.W. et al. Effect of Free Surface on the Stability of Individual Retained Austenite Grains in a Duplex Stainless Steel. Metall Mater Trans A 45, 4875–4881 (2014). https://doi.org/10.1007/s11661-014-2435-6

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