Title

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

Authors

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

Abstract

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.

Subjects

X-ray diffraction; LUDERS bands; TRANSFORMATION induced plasticity steel; AUSTENITE; DEFORMATIONS (Mechanics)

Publication

Materials Research Letters, 2018, Vol 6, Issue 12, p662

ISSN

2166-3831

Publication type

Academic Journal

DOI

10.1080/21663831.2018.1530698