Abstract
A high strength steel with yield strength on the order of 600 MPa was developed successfully with only addition of titanium alloying element based on a low-carbon steel. The results showed that the hot deformation accelerated ferrite and pearlite transformation and retarded bainite transformation under continuous cooling condition. The microstructure of this steel was mainly composed of fine grained ferrite and carbides distributing along the ferrite grain boundaries. The yield and tensile strengths of steels were about 620 – 650 MPa and 720 – 740 MPa, respectively, and the values of strain hardening exponent and plastic strain ratio were 0. 12 and 0. 80, respectively, thereby providing a good combination of strength with toughness. In short, the fine grained ferrite and TiC precipitation strengthening contributed to a high strength.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
Misra R D K, Tenneti K K, Weatherly G C, et al. Microstructure and Texture of Hot-Rolled Nb-Ti and V-Nb Microalloyed Steels With Differences in Formability and Toughness [J]. Metallurgical and Materials Transactions (Physical Metallurgy and Materials Science), 2003, 34A(10): 2341.
Funakawa Y, Shiozaki T, Tomita K, et al. Development of High Strength Hot-Rolled Sheet Steel Consisting of Ferrite and Nanometer-Sized Carbides [J]. ISIJ International, 2004, 44 (11): 1945.
Tanniru M, Shanmugam S, Misra R D K, et al. Microalloyed V-Nb-Ti and V Steels Part 1—Stereological Study of Ferrite-Pearlite Microstructure and Its Relationship to Toughness [J]. Materials Science and Technology, 2005, 21(2): 159.
Ghosh A, Mishra B, Chatterjee S. Development of Low Carbon Microalloyed Ultra High Strength Steels [J]. Materials Science Forum, 2005, 500–501: 551.
Misra R D K, Nathani H, Hartmann J E, et al. Microstructural Evolution in a New 770 MPa Hot Rolled Nb-Ti Microalloyed Steel [J]. Materials Science and Engineering, 2005, 394A(1/2): 339.
Nakata N, Militzer M. Modeling of Microstructure Evolution During Hot Rolling of a 780 MPa High Strength Steel [J]. ISIJ International, 2005, 45(1): 82.
Khlestov V M, Konopleva E V, McQueen H J. Kinetics of Austenite Transformation During Thermomechanical Processes [J]. Canadian Metallurgical Quarterly, 1998, 37(2): 75.
Shipway P H, Bhadeshia H K D H. Mechanical Stabilization of Bainite [J]. Materials Science and Technology, 1995, 11(11): 1116.
Herman J C, Donnay B, Leroy V. Precipitation Kinetics of Microalloying Additions During Hot-Rolling of HSLA Steels [J]. ISIJ International, 1992, 32(6): 779.
HUO Xiang-dong, MAO Xin-ping, LI Lie-jun, et al. Strengthening Mechanism of Ti Microalloyed High Strength Steel Produced by TSCR [J]. Iron and Steel, 2007, 42(10): 64 (in Chinese).
Gladman T. Second Phase Particle Distribution and Secondary Recrystallization [J]. Scripta Metallurgica et Materialia, 1992, 27(11): 1569.
Author information
Authors and Affiliations
Corresponding author
Additional information
Foundation Item: Item Sponsored by High Technology Development Program of China (2003AA33G010); Central Collegiate Basic Scientific Bursary of China (N090307001)
Rights and permissions
About this article
Cite this article
Yi, Hl., Liu, Zy., Wang, Gd. et al. Development of Ti-Microalloyed 600 MPa hot rolled high strength steel. J. Iron Steel Res. Int. 17, 54–58 (2010). https://doi.org/10.1016/S1006-706X(10)60197-5
Received:
Published:
Issue Date:
DOI: https://doi.org/10.1016/S1006-706X(10)60197-5