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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 highenergy 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 × 10 14 m −2 to 1.5 × 10 15 m −2 after Lüders band propagation. IMPACT STATEMENTThis in situ high-energy X-ray diffraction study unravels two-dimensional distribution of microstructural evolution during Lüders band propagation in medium-Mn TRIP steels.

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