Effect of N on Mirostructures and Mechanical Properties of Vanadium Containing Q345 Steel

Yang Jichun; Tian Shiyu; Yu Haicun; Zhang Zening; Wang Jun; Yan Ruijun

doi:10.7513/j.issn.1004-7638.2019.01.023

Volume 40 Issue 1

Feb. 2019

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Article Navigation > IRON STEEL VANADIUM TITANIUM > 2019 > 40(1): 129-135

Yang Jichun, Tian Shiyu, Yu Haicun, Zhang Zening, Wang Jun, Yan Ruijun. Effect of N on Mirostructures and Mechanical Properties of Vanadium Containing Q345 Steel[J]. IRON STEEL VANADIUM TITANIUM, 2019, 40(1): 129-135. doi: 10.7513/j.issn.1004-7638.2019.01.023

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Yang Jichun, Tian Shiyu, Yu Haicun, Zhang Zening, Wang Jun, Yan Ruijun. Effect of N on Mirostructures and Mechanical Properties of Vanadium Containing Q345 Steel[J]. IRON STEEL VANADIUM TITANIUM, 2019, 40(1): 129-135. doi: 10.7513/j.issn.1004-7638.2019.01.023

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Effect of N on Mirostructures and Mechanical Properties of Vanadium Containing Q345 Steel

doi: 10.7513/j.issn.1004-7638.2019.01.023

1. School of Material and Metallurgy, Inner Mongolia University of Science and Technology, Baotou 014010, Inner Mongolia, China;
2. School of Metallurgy, Northeast University, Shenyang 110819, Liaoning, China

Received Date: 2018-08-27

Abstract

Abstract

The test steels in this study had base chemistry of Q345 steel with 0.08%V and various nitrogen contents of 0%, 0.022%,0.034% and 0.042%.Thermo-Calc software was used for the thermodynamic calculation.When steel is free of nitrogen,the calculated V(C,N) precipitation temperature in austeniteis 933℃.When the nitrogen content in the steel is 420×10^-6.the precipitation temperature of V(C,N) is 1 340℃.TEM observation indicates that increasing nitrogen content can result in a large number of V(C,N) which plays the role of precipitation strengthening and refining grain.The mechanical properties of the steel increase significantly with increasing nitrogen content.The steel free of nitrogen has yield strength of 486 MPa,and tensile strength of 686 MPa.When the nitrogen content is 340×10^-6,the yield strength of the test steel is 610 MPa,and the tensile strength is 732 MPa.Fracture observation show that toughness and ductility of Q345 steel has been enhanced with increase of nitrogen content.
- Q345 steel,
- Thermo-Calc software,
- V (C,N) precipitation,
- mechanical property

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