Reverse-transformation austenite structure control with micro/nanometer size

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Article

Abstract

To control the reverse-transformation austenite structure through manipulation of the micro/nanometer grain structure, the influences of cold deformation and annealing parameters on the microstructure evolution and mechanical properties of 316L austenitic stainless steel were investigated. The samples were first cold-rolled, and then samples deformed to different extents were annealed at different temperatures. The microstructure evolutions were analyzed by optical microscopy, scanning electron microscopy (SEM), magnetic measurements, and X-ray diffraction (XRD); the mechanical properties are also determined by tensile tests. The results showed that the fraction of stain-induced martensite was approximately 72% in the 90% cold-rolled steel. The micro/nanometric microstructure was obtained after reversion annealing at 820–870°C for 60 s. Nearly 100% reversed austenite was obtained in samples annealed at 850°C, where grains with a diameter ≤ 500 nm accounted for 30% and those with a diameter > 0.5 μm accounted for 70%. The micro/nanometer-grain steel exhibited not only a high strength level (approximately 959 MPa) but also a desirable elongation of approximately 45%.

Keywords

austenitic stainless steel structure control martensite reverse transformation grain refinement 

Notes

Acknowledgments

This research was supported by the National Natural Science Foundation of China (Grant No. 51474031).

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© The Author(s) 2017

Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

Authors and Affiliations

  • Hui-bin Wu
    • 1
    • 2
  • Gang Niu
    • 1
    • 2
  • Feng-juan Wu
    • 2
  • Di Tang
    • 1
    • 2
  1. 1.Collaborative Innovation Center of Steel TechnologyUniversity of Science and Technology BeijingBeijingChina
  2. 2.Beijing Engineering Technology Research Center of Special Steel for Traffic and EnergyBeijingChina

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