Effect of Microstructure and Texture Evolution During Variable Gauge Rolling on Mechanical Properties of Tailor Rolled Blanks

• Published in: Metals and materials international Vol. 25; no. 5; pp. 1378 - 1387
• Main Authors: Shafiei, E., Dehghani, K., Ostovan, F., Toozandehjani, Meysam
• Format: Journal Article
• Language: English
• Published: Seoul The Korean Institute of Metals and Materials 01-09-2019; Springer Nature B.V; 대한금속·재료학회
• Subjects: Automobile industry; Characterization and Evaluation of Materials; Chemistry and Materials Science; Crystallography; Deformation mechanisms; Distribution functions; Dual phase steels; Duplex stainless steels; Elastic anisotropy; Elastic properties; Elongation; Engineering Thermodynamics; Ferrite; Grain boundaries; Grain refinement; Grain size; Heat and Mass Transfer; Longitude; Machines; Magnetic Materials; Magnetism; Manufacturing; Materials Science; Mechanical properties; Metallic Materials; Microstructure; Modulus of elasticity; Pole figures; Processes; Solid Mechanics; Substructures; Tensile stress; Texture; Thickness ratio; Yield stress; 재료공학; Rolling; Tailor rolled blank; TRB; Texture; Dual phase; EBSD
• ISSN: 1598-9623; 2005-4149
• DOI: 10.1007/s12540-019-00269-4

In this study, anisotropic elastic and plastic mechanical properties of a tailor rolled blank (TRB) with thickness ratio of 0.52 (1 mm/1.9 mm), have been fully studied. To gain a deeper insight into anisotropic mechanical behavior of the studied TRB, continuous changes in microstructure and crystallographic texture of a dual phase steel caused by variable gauge rolling (VGR) were investigated on several points (on RD–ND plane) along longitudinal direction with the aid of EBSD observations. Analysis of grain boundary (GB) maps revealed that ferrite grain refinement is occurred during VGR so that the average ferrite grain size decreases from 4.1 µm for the thicker side to 2.2 µm for the thinner side. Furthermore, it was found out that substructure density is more intense within smaller ferrite grains. Evaluation of inverse pole figures as well as orientation distribution function maps showed that texture of thicker side comprises {001}〈110〉 and {112}〈110〉 components along
α
-fiber. In addition, it was revealed that orientations of {111}〈110〉 and {111}〈112〉 along
γ
-fiber strengthen along VGR direction by further increase in thickness reduction near thinner side. Accordingly, unprecedented gradual changes in mechanical properties with respect to these changes in microstructure and texture, were obtained. Finally, the correlation between in-plane anisotropic mechanical properties [Young’s modulus (E), yield stress (YS), ultimate tensile stress (UTS) and total elongation] of the studied tailor rolled blank with microstructure and deformation texture was interpreted.