Effect of Cr content on the microstructure evolution in weld metal for <styled-content style-type="number">1000</styled-content> MPa grade high strength steel

FENG Wei; YU Tingxiang; CHEN Bo; ZHANG Qingsu; CAI Hongguang; ZHANG Biying; MA Qiang

doi:10.12073/j.hjxb.20240409001

TRANSACTIONS OF THE CHINA WELDING INSTITUTION > 2024 > 45(9): 76-83. > DOI: 10.12073/j.hjxb.20240409001

FENG Wei, YU Tingxiang, CHEN Bo, ZHANG Qingsu, CAI Hongguang, ZHANG Biying, MA Qiang. Effect of Cr content on the microstructure evolution in weld metal for 1000 MPa grade high strength steel[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2024, 45(9): 76-83. DOI: 10.12073/j.hjxb.20240409001

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Effect of Cr content on the microstructure evolution in weld metal for 1000 MPa grade high strength steel

1.
Harbin Well Welding Co., Ltd., Harbin, 150060, China
2.
Harbin Welding Institute Limited Company, Harbin, 150028, China
3.
Dalian Jinzhou Heavy Machinery Group Co., Ltd., Dalian, 116100, China
4.
Jiangsu Rongda Material Corrosion Inspection Co., Ltd., Wuxi, 214000, China

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Received Date: April 08, 2024
Available Online: July 01, 2024

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Abstract

Abstract

Five kinds of submerged arc welding materials of 1000 MPa grade high strength steel with different Cr content were designed and deposited metals with Cr content of 0% ~ 0.9% were prepared by wire electrode submerged arc welding. OM, SEM, TEM and CLSM were used to study the effect of Cr content on the microstructure evolution of 1000 MPa grade high strength steel, and the mechanical properties were evaluated by tensile and impact tests. The results show that, with the increase of Cr content, the initial temperature of ferrite transition increases from 723.3 ℃ to 740.2 ℃, and the initial temperature of bainite transition decreases from 470.2 ℃ to 458.5 ℃. The range of ferrite transition temperature expands, and the bainite transition rate is faster in high Cr deposited metal. The acicular ferrite and bainite ferrite in deposited metal increased, the M-A component gradually showed chain segregation from dispersion, and the proeutectoid ferrite and residual austenite decreased. The impact fracture of deposited metal changes from ductile fracture with low Cr to quasi-cleavage fracture with high Cr. Compared with 0 Cr, the tensile strength and yield strength of 0.9%Cr are increased by 12.4% and 17.0%, respectively. The impact absorption energy of deposited metal increases first and then decreases. At −40 ℃, the low temperature toughness of deposited metal with Cr content of 0.6% is the highest, which is 84 J. When Cr content of deposited metal is 0.6%, the matching effect of strength and toughness is the best.
- 1000 MPa grade high strength steel,
- deposited metal,
- Cr content,
- microstructure evolution,
- confocal laser scanning microscope

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References

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Effect of Cr content on the microstructure evolution in weld metal for 1000 MPa grade high strength steel