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Abnormal Anisotropic Dilatation During Bainitic Transformation of Ausformed Austenite

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Abstract

There is significant anisotropic dilatation during bainitic transformation from plastically deformed austenite in a structurally and chemically homogenous alloy with no externally applied stress. The abnormal dilatation was found to be due to pronounced variant selection in a specific-textured austenite based on electron backscatter diffraction analysis and X-ray diffraction. A general rule of variant selection has been proposed, that the favored variants within an austenite grain usually belong to the same Bain group.

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H. Chen acknowledges financial support from Beijing Natural Science Foundation (2182024), the National Natural Science Foundation of China (Grant 51501099), National Key R&D program of China (2016YFB0300104), and National Young 1000-Talents Program (D1101073). Z.-G. Yang acknowledges financial support from the National Natural Science Foundation of China (Grant 51771100). C. Zhang acknowledges financial support from the National Natural Science Foundation of China (Grant 2015CB654802), the National Magnetic Confinement Fusion Energy Research Project of China (Grant 2015GB118001), and Fund of Key Laboratory of Advanced Materials of Ministry of Education (Grant 2017AML09).

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Authors and Affiliations

  1. Key Laboratory of Advanced Materials of Ministry of Education, School of Materials Science and Engineering, Tsinghua University, Beijing, 100084, P.R. China

    Jianguo He, Juan Du, Wenzheng Zhang, Chi Zhang, Zhi-Gang Yang & Hao Chen

Authors
  1. Jianguo He
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  2. Juan Du
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  3. Wenzheng Zhang
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  4. Chi Zhang
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  5. Zhi-Gang Yang
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  6. Hao Chen
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Corresponding author

Correspondence to Hao Chen.

Additional information

Manuscript submitted August 27, 2018.

Appendix

Appendix

See Table A1 and Figures A1 through A3.

Table A1 Twelve Variants of the N–W OR for γ to α Transformation
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Fig. A1
figure 5

Compression direction (CD) inverse pole figure of retained austenite

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Fig. A2
figure 6

The N–W variants of the {0 0 1} bainitic ferrite pole figure with respect to their parent austenite of (0 0 1) standard stereographic projection

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Fig. A3
figure 7

Sketch of shape change from austenite unit sphere to bainitic ferrite in crystal space

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He, J., Du, J., Zhang, W. et al. Abnormal Anisotropic Dilatation During Bainitic Transformation of Ausformed Austenite. Metall Mater Trans A 50, 540–546 (2019). https://doi.org/10.1007/s11661-018-5038-9

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