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Microstructure failure in ferrite-martensite dual phase steel under in-situ tensile test

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Abstract

To investigate microstructure failure in ferrite-martensite dual phase steel, in-situ observations were performed on multiple plate DP800 specimens during uniaxial tensile tests. Microstructure evolution of the observed region was investigated in details. The experimental data showed that micro-cracks in various regions differed in the initiation time, and micro-failures mainly occurred from the locations with typical characteristics of stress concentration (i. e. ferrite interiors, the interfaces of ferrite-martensite grains and the martensite-martensite interfaces). Growth of micro-crack generally experienced the following stages: cracking from martensite boundaries, tiny particles in ferrite interiors, or martensite interiors, propagating in ferrite, bypassing martensite boundaries, or passing through martensite-martensite interfaces, finally ending on martensite boundaries. Martensite was one important source of micro-failure and changed the propagation of micro-cracks significantly. Microstructure deformation was inhomogeneous in the stage of plastic deformation.

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Authors and Affiliations

  1. Department of Engineering Mechanics, Shanghai Jiao Tong University, 200240, Shanghai, China

    Rui-bin Gou, Wen-jiao Dan & Wei-gang Zhang

  2. School of Mechanical Engineering, Anhui Science and Technology University, 233100, Bengbu, Anhui, China

    Rui-bin Gou, Chun-yu Zhang & Yin-hu Qiao

  3. Innovation Center for Advanced Ship and Deep-Sea Exploration, Shanghai Jiao Tong University, 200240, Shanghai, China

    Rui-bin Gou, Wen-jiao Dan & Wei-gang Zhang

  4. College of Architectur, Anhui Science and Technology University, 233100, Bengbu, Anhui, China

    Min Yu (Assoc. Prof.) & Lu Ma

Authors
  1. Rui-bin Gou
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  2. Wen-jiao Dan
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  3. Wei-gang Zhang
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  4. Min Yu
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  5. Chun-yu Zhang
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  6. Yin-hu Qiao
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  7. Lu Ma
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Gou, Rb., Dan, Wj., Zhang, Wg. et al. Microstructure failure in ferrite-martensite dual phase steel under in-situ tensile test. J. Iron Steel Res. Int. 24, 350–356 (2017). https://doi.org/10.1016/S1006-706X(17)30050-X

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  • DOI: https://doi.org/10.1016/S1006-706X(17)30050-X

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