Abstract
An experimental steel of the composition (in wt.%) 0.04C-0.81Mn-0.38Si-0.15Ti-0.01S-0.013P-0.043Al was hot rolled into 4 mm plates at three different temperatures of 1100, 1000, and 900 °C. The yield strengths of these plates were in the range of 434-484 MPa while the ultimate tensile strength varied from 508 to 586 MPa. Elongation values ranged from 13.0 to 17.8%. Hole expansion ratios (λ) varied from 23 to 30.7%. In particular, the plate rolled at 1000 °C showed a yield strength of 484 MPa, an ultimate tensile strength of 586 MPa, a total elongation of ~15%, and a hole expansion ratio of ~23%. Transmission electron microscopy showed the presence of fine precipitates of titanium carbosulfide (~10-50 nm). Therefore, maximum precipitation strengthening was obtained in the plate that was hot rolled into a thickness of 4 mm at 1000 °C.
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Acknowledgments
The authors’ thanks are due to the management of the R & D Centre for Iron and Steel (RDCIS), the Steel Authority of India Ltd. (SAIL) for their permission to undertake this research. The help received from the respective staff of melting and solidification laboratories, the experimental rolling mill, metallography, and the mechanical and formability testing laboratories is gratefully acknowledged.
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Sarkar, B., Jha, B.K. Development of Precipitation Strengthened Steel with Adequate Stretch Flangeability. J. of Materi Eng and Perform 20, 1414–1418 (2011). https://doi.org/10.1007/s11665-010-9777-z
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DOI: https://doi.org/10.1007/s11665-010-9777-z