Structure Formation and Mechnical Properties of Low-Carbon Steel After Lengthwise and Cross Rolling

• Published in: Russian physics journal Vol. 64; no. 10; pp. 1899 - 1906
• Main Authors: Gordienko, A. I., Pochivalov, Yu. I., Vlasov, I. V., Mishin, I. P.
• Format: Journal Article
• Language: English
• Published: Cham Springer International Publishing 01.02.2022; Springer; Springer Nature B.V
• Subjects: Carbon steel; Condensed Matter Physics; Cross rolling; Crystallography; Elongated structure; Grain boundaries; Hadrons; Hardness; Heavy Ions; Lasers; Low carbon steel; Low carbon steels; Low temperature resistance; Mathematical and Computational Physics; Mechanical properties; Microhardness; Notch toughness; Nuclear Physics; Optical Devices; Optics; Perlite; Photonics; Physics; Physics and Astronomy; Plastic properties; Steel structures; Steel, Structural; Theoretical; Toughness; cross rolling; microstructure; strength; low-carbon steel; texture; impact toughness; micromechanisms of fracture; lengthwise rolling
• ISSN: 1064-8887; 1573-9228
• DOI: 10.1007/s11182-022-02539-y

The paper investigates the microstructure formation, mechanical properties, and cold resistance of the grade X70 low-carbon steel after lengthwise and cross rolling. It is shown that the elongated grains forming in the steel structure after lengthwise rolling, have a large quantity of low-angle grain boundaries and the {001} crystallographic plane orientation that lead to a significant increase in the steel microhardness and strength properties (1050 MPa) and a decrease in the plasticity, notch toughness (25 J/cm 2 at –70°C), and cold resistance of V-notch specimens. Although the additional steel tempering after lengthwise rolling promotes the decrease in the microhardness and strength properties (900 MPa), the plasticity and notch toughness increase up to 15% and 195 J/cm 2 , respectively. After cross rolling, the notch toughness of V-notch specimen remains high (260 J/cm 2 ) at –70°C test temperature due to the formation of a small amount of 3.3 μm equiaxial disperse perlite grains and more uniform distribution of the structure components and axial texture.