Materials Research Letters (Dec 2018)

In situ high-energy X-ray diffraction mapping of Lüders band propagation in medium-Mn transformation-induced plasticity steels

  • Minghe Zhang,
  • Runguang Li,
  • Jie Ding,
  • Haiyang Chen,
  • Jun-Sang Park,
  • Jonathan Almer,
  • Yan-Dong Wang

DOI
https://doi.org/10.1080/21663831.2018.1530698
Journal volume & issue
Vol. 6, no. 12
pp. 662 – 667

Abstract

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Two-dimensional distributions of microstructural characteristics of austenite (γ) around the Lüders band in medium-Mn transformation-induced plasticity (TRIP) steel were revealed by in situ high-energy X-ray diffraction. Lüders band propagation leads to significant changes in the volume fraction and lattice strains of austenite. The evolution of the lattice strain of γ-311 accords well with the true yield behavior model and is used to estimate the angle of the Lüders band front with respect to the tensile axis. The modified Williamson-Hall analysis shows that the dislocation density in austenite increased from 7 × 1014 m−2 to 1.5 × 1015 m−2 after Lüders band propagation.

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