Through-Thickness Microstructure and Strain Distribution in Steel Sheets Rolled in a Large-Diameter Rolling Process

• Main Authors: Tadanobu Inoue, Hai Qiu, Rintaro Ueji
• Format: Article
• Language: English
• Published: MDPI AG 2020-01-01
• Series: Metals
• Subjects: rolling; low-carbon steels; ultrafine-grained structure; finite element method
• Online Access: https://www.mdpi.com/2075-4701/10/1/91

The rolling condition for fabricating a low-carbon niobium-microalloyed steel sheet with an ultrafine-grained (UFG) structure was examined through rolling experiments and finite element analysis. A large-diameter rolling process was proposed to create a UFG structure. The rolling was conducted near the transformation point, A_r3, from austenite to ferrite. The A_r3 was measured at the surface and the center of the sheet. First, the through-thickness microstructure and equivalent strain distribution in a 1-pass rolled sheet 2.0 mm thick were examined. In the rolling experiments, the embedded pin method was employed to understand through-thickness deformation. The magnitude of the equivalent strain to obtain a UFG structure was estimated to be 2.0. Based on these results, the fabrication of a 2 mm UFG steel sheet by 3-pass rolling for an initial thickness of 14.5 mm was attempted by the proposed large-diameter rolling process.