Effect of microalloying elements Ti and Nb on impact property of high-strength engineering structural steel

LIU Shuai; WANG Fu-ming; LI Yong-liang

doi:10.13374/j.issn2095-9389.2018.s1.007

Volume 40 Issue S1

Dec. 2018

Turn off MathJax

Article Contents

Article Navigation > Chinese Journal of Engineering > 2018 > 40(S1): 41-46

LIU Shuai, WANG Fu-ming, LI Yong-liang. Effect of microalloying elements Ti and Nb on impact property of high-strength engineering structural steel[J]. Chinese Journal of Engineering, 2018, 40(S1): 41-46. doi: 10.13374/j.issn2095-9389.2018.s1.007

Citation:

LIU Shuai, WANG Fu-ming, LI Yong-liang. Effect of microalloying elements Ti and Nb on impact property of high-strength engineering structural steel[J]. Chinese Journal of Engineering, 2018, 40(S1): 41-46. doi: 10.13374/j.issn2095-9389.2018.s1.007

Citation:

PDF( 744 KB)

Effect of microalloying elements Ti and Nb on impact property of high-strength engineering structural steel

doi: 10.13374/j.issn2095-9389.2018.s1.007

1. School of Metallurgical and Ecological Engineering,University of Science and Technology Beijing;
2. Technology Center of Tangsteel Company,Hesteel Group

Received Date: 2018-07-17
Available Online: 2023-07-18

Abstract

Abstract

Comparing the properties of Q345E steels of two different components, it is found that the yield strength and tensile strength of Q345E increase with the additions of microalloying elements Nb and Ti, but the low-temperature impact performance reduces.The results of the equilibrium phase calculation of Nb-Ti steel and C-Mn steel using thermodynamic software Thermo-Calc reveal that the main difference between them is the precipitation of (Nb, Ti) (C, N) phase.Furthermore, three titanium containing high-strength test steels were designed to observe the microtopography of the fracture and the second-phase particles of steels after impact test under scanning electron microscopy.With the increase of Ti, the low-temperature impact performance of steels reduced, and a number of large particles were gathered in the fracture, which were found to be (Nb, Ti) (C, N) using energy dispersive spectrometer (EDS) analysis, resulting in reduced impact energy.The results indicate that Ti deteriorates the low-temperature impact performance of low-alloy high-strength steel Q345E;therefore, it is necessary to control the size of the second-phase particles using controlled rolling and cooling or component design.
- low-alloy high-strength steel,
- microalloying,
- thermodynamic software Thermo-Calc,
- (Nb,
- Ti) (C

FullText(HTML)

References(7)

References

[1]	Qi J J, Li S J, Zhao C F. Effect of microalloy element on low-temperature toughness of Q345E steel bar. Hot Work Technol, 2009, 38 (10) :80 (齊建軍, 李紹杰, 趙春風.微合金元素對Q345E棒材低溫韌性的影響.熱加工工藝, 2009, 38 (10) :80)
[2]	Gao Z P. Approach to strengthening mechanism and production process of low-alloy high-strength steel. Hunan Metall, 2001 (1) :17 (高澤平.低合金高強度鋼的強化機理及生產工藝的探討.湖南冶金, 2001 (1) :17)
[3]	Suzuki K, Miyagawa S, Saito Y, et al. Effect of microalloyed nitride forming elements on precipitation of carbonitride and high temperature ductility of continuously cast low carbon Nb containing steel slab. ISIJ Int, 1995, 35 (1) :34
[4]	Wang Z Y, Wang C H. Cause analysis on disqualification of low temperature impact property of Q345E medium plate. Wide Heavy Plate, 2011, 17 (6) :16 (王智軼, 王彩虹. Q345E低溫沖擊不合分析.寬厚板, 2011, 17 (6) :16)
[5]	Yang X Y, Xu G, Yang J, et al. Strengthening mechanism of Ti-Ni composite micro-alloyed high strength steel. Hot Work Technol, 2013, 42 (10) :50 (楊雪瑩, 徐光, 楊靜, 等. Ti-Nb復合微合金化高強度鋼強化機理研究.熱加工工藝, 2013, 42 (10) :50)
[6]	Ghosh A, Ray A, Chakrabarti D, et al. Cleavage initiation in steel:competition between large grains and large particles. Mater Sci Eng A, 2013, 561:126
[7]	Li Y L. Study on Composition Design and Microstructure Control about 700 MPa Grade High Strength Beam Steel for Vehicles[Dissertation]. Beijing:University of Science and Technology Beijing, 2016 (李永亮. 700 MPa級高強度汽車大梁鋼成分設計與組織控制研究[學位論文].北京:北京科技大學, 2016)