In situ high-energy X-ray diffraction mapping of Lüders band propagation in medium-Mn transformation-induced plasticity steels. Issue 12 (2nd December 2018)

• Record Type: Journal Article
• Authors: Zhang, Minghe; Li, Runguang; Ding, Jie; Chen, Haiyang; Park, Jun-Sang; Almer, Jonathan; Wang, Yan-Dong
• Is Part Of: Materials research letters. Volume 6:Issue 12(2018)
• Page Start: 662
• Page End: 667
• Publication Date: 2018-12-02
• Subjects: Lüders band -- medium-Mn TRIP steel -- high-energy X-ray diffraction; Materials science -- Research -- Periodicals; Biomedical materials -- Research -- Periodicals; Composite materials -- Research -- Periodicals; Biomedical materials -- Research; Composite materials -- Research; Materials science -- Research; Periodicals; 620.1105
• DOI: 10.1080/21663831.2018.1530698
• Languages: English
• ISSNs: 2166-3831

Abstract

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