Gradient ultrafine ferrite and martensite structure and its tensile properties by asymmetric rolling in low carbon microalloyed steel

• Published in: Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2013-10, Vol.583, p.205-209
• Main Authors: Cai, M.H., Singh Dhinwal, S., Han, Q.H., Chao, Q., Hodgson, P.D.
• Format: Article
• Language: English
• Subjects: Applied sciences; Asymmetric rolling; Cross-disciplinary physics: materials science; rheology; Elasticity and anelasticity; Elasticity. Plasticity; Exact sciences and technology; Forming; Gradient structure; Materials science; Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology; Metals. Metallurgy; Other heat and thermomechanical treatments; Physics; Production techniques; Rolling; Shear texture; Tensile properties; Treatment of materials and its effects on microstructure and properties; Ultrafine ferrite
• ISSN: 0921-5093; 1873-4936
• DOI: 10.1016/j.msea.2013.06.076

Asymmetric rolling (AsR) was carried out to achieve a gradient ultrafine ferrite and martensite duplex structure in a commercial low-carbon microalloyed steel and compared with symmetric rolling. Two specific fiber textures 〈110〉//RD and 〈111〉//ND were developed through the thickness when imposing shear strains by AsR. In hibition of plastic instability in the ultrafine ferrite was closely associated with the gradient grain-size distribution, beneficial shear fiber textures and the dispersed martensite, resulting in high strength (~905MPa) with good ductility (~17%).