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Formation of two-phase coupled microstructure in AISI 304 stainless steel during directional solidification

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Abstract

Formation and evolution details of a two-phase coupled microstructure in AISI 304 stainless steel are studied by quenching method during directional solidification. Results show that the coupled growth microstructure, which is composed of thin lath-like ferrite (δ) and austenite (γ), crystallizes first in the form of colony from the melt. As solidification develops, the retained liquid transforms into austenite gradually. On cooling, solid-state transformation from ferrite to austenite results in the disappearance of part thinner ferrites and the final two-phase coupled microstructure is formed after the solid-state transformation. The formation mechanism of the two-phase coupled microstructure is analyzed based on the nucleation and constitutional undercooling criterion (NCU) before steady-state growth of each phase is reached.

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Authors and Affiliations

  1. School of Materials Science and Engineering, Harbin Institute of Technology, Harbin, 150001, China

    J. W. Fu & J. J. Guo

  2. Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, China

    Y. S. Yang, J. C. Ma & W. H. Tong

Authors
  1. J. W. Fu
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  2. Y. S. Yang
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  3. J. J. Guo
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  4. J. C. Ma
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  5. W. H. Tong
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Correspondence to Y. S. Yang.

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Fu, J.W., Yang, Y.S., Guo, J.J. et al. Formation of two-phase coupled microstructure in AISI 304 stainless steel during directional solidification. Journal of Materials Research 24, 2385–2390 (2009). https://doi.org/10.1557/jmr.2009.0282

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  • DOI: https://doi.org/10.1557/jmr.2009.0282

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