Texture Inheritance in the Ferrito-Martensite Structure of Low-Alloy Steel after Thermomechanical Controlled Processing

• Published in: Physics of metals and metallography 2019-12, Vol.120 (12), p.1180-1186
• Main Authors: Lobanov, M. L., Pyshmintsev, I. Yu, Urtsev, V. N., Danilov, S. V., Urtsev, N. V., Redikultsev, A. A.
• Format: Article
• Language: English
• Subjects: Alloys; Bainite; Boron steel; Chemistry and Materials Science; Crystallography; Diffusion; Ferrite; Gamma phase; Heat treating; Heat treatment; Iron compounds; Low alloy steels; Low carbon steels; Martensite; Martensitic transformations; Materials Science; Metallic Materials; Officials and employees; Orientation relationships; Phase Transformations; Phase transitions; Specialty metals industry; Specialty steels; Steel alloys; Structure; Texture; Thermomechanical treatment
• ISSN: 0031-918X; 1555-6190
• DOI: 10.1134/S0031918X1912010X

The electron back-scatter diffraction (EBSD) method was used to study the structural and textural states of low-carbon low-alloy steel after thermomechanical controlled processing (TMCP) and subsequent heat treatment (HT) including austenitization, holding at the temperature of the decomposition of the γ phase by the diffusion mechanism for different times, and quenching. As a result of the HT, structures were obtained consisting of polygonal ferrite and martensite in various ratios. The crystallographic textures of both martensite and ferrite after HT reproduced the texture of bainite formed as a result of the TMCP. The orientations that form this texture are related to the main orientations of deformed austenite grains upon the TMCP via the orientation relationships (ORs) intermediate between the Kurdjumov–Sachs and Nishiyama–Wassermann ORs. In the case of both ferrite and martensite, the orientational connection between the components of the texture components is explained by the onset of the realization of the phase transformation on crystallographically stipulated (including special) boundaries.