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Displacive Phase Transformation and Surface Effects Associated with Confocal Laser Scanning Microscopy

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Abstract

The influence of the free surface on martensitic transformation was examined by comparing the highest temperature at which martensite forms (MS), as measured using dilatometry, with surface observations using confocal laser scanning microscopy. It is found that the proximity of the surface during confocal microscopy permits martensitic transformation to occur at a higher temperature with a reduced free energy change. This is because the strain energy from the shape deformation accompanying the growth of martensite is reduced at a free surface. The second observation is that plates of martensite tend to coalesce as they approach the free surface where there is reduced constraint. The general observations are backed by calculating the strain energy caused by a subsurface edge dislocation as a function of the orientation of its Burgers vector relative to the free surface.

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Acknowledgments

We are grateful to Professor Nackjoon Kim for laboratory facilities at GIFT and to POSCO for the Steel Innovation Program. Support from the World Class University Program of the National Research Foundation of Korea, Ministry of Education, Science and Technology, project number R32–2008–000–10147–0 is gratefully acknowledged.

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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

    Junhak Pak (Researcher), Dong Woo Suh (Professor) & H. K. D. H. Bhadeshia (Professor)

  2. Department of Materials Science and Metallurgy, University of Cambridge, Cambridge, CB2 3QZ, U.K.

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

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  1. Junhak Pak
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  2. Dong Woo Suh
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  3. H. K. D. H. Bhadeshia
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Correspondence to Junhak Pak.

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Manuscript submitted September 23, 2011.

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Pak, J., Suh, D.W. & Bhadeshia, H.K.D.H. Displacive Phase Transformation and Surface Effects Associated with Confocal Laser Scanning Microscopy. Metall Mater Trans A 43, 4520–4524 (2012). https://doi.org/10.1007/s11661-012-1264-8

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  • DOI: https://doi.org/10.1007/s11661-012-1264-8

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