Effects of Welding Processes on the Low Temperature Impact Toughness of Structural Steel Welded Joints

Utilizing submerged arc welding under heat input 50 kJ/cm on 60 mm thick marine engineering structure plate F550, the effect of preheating and post welding heat treatment on the microstructure and impact toughness of coarse-grained heat-affected zone (CGHAZ) has been investigated. The original microstructure of the steel plate is tempered martensite. The yield and tensile strength is 610 and 660 MPa, respectively. The impact absorbed energy at low temperature (-60 °C) at transverse direction reaches about 230~270 J. Welding results show that the preheating at 100 °C did not have obvious influence on the microstructure and toughness; whereas the tempering at 600 °C for 2.5 h after welding could significantly reduce the amount of M-A components in the coarse-grained heat-affected zone and thus improved the low temperature impact toughness.

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Improvement of low-temperature impact toughness for 304 weld joint produced by laser-MIG hybrid welding under magnetic field

Journal of Materials Processing Technology ◽

10.1016/j.jmatprotec.2017.04.004 ◽

2017 ◽

Vol 247 ◽

pp. 306-314 ◽

Cited By ~ 16

Author(s):

Rong Chen ◽

Ping Jiang ◽

Xinyu Shao ◽

Gaoyang Mi ◽

Chunming Wang ◽

...

Keyword(s):

Magnetic Field ◽

Low Temperature ◽

Impact Toughness ◽

Weld Joint ◽

Hybrid Welding ◽

Temperature Impact ◽

Low Temperature Impact Toughness

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Effect of Heat Treatment Technique on the Low Temperature Impact Toughness of Steel EQ70 for Offshore Structure

High Temperature Materials and Processes ◽

10.1515/htmp-2015-0265 ◽

2017 ◽

Vol 36 (8) ◽

pp. 825-830 ◽

Cited By ~ 2

Author(s):

Su-Fen Tao ◽

Yun-Jin Xia ◽

Fu-Ming Wang ◽

Jie Li ◽

Ding-Dong Fan

Keyword(s):

Heat Treatment ◽

Low Temperature ◽

Impact Toughness ◽

Treatment Technique ◽

Offshore Structure ◽

Treatment Techniques ◽

Temperature Impact ◽

Low Temperature Impact Toughness ◽

The Impact ◽

Quenching And Tempering

AbstractCircle quenching and tempering (CQ&T), intercritical quenching and tempering (IQ&T) and regular quenching and tempering (Q&T) were used to study the influence of heat treatment techniques on the low temperature impact toughness of steel EQ70 for offshore structure. The steels with 2.10 wt. % Ni (steel A) and 1.47 wt. % Ni (steel B) were chosen to analyze the effect of Ni content on the low temperature impact toughness of steel EQ70 for offshore structure. The fracture morphologies were examined by using a scanning electron microscope (SEM, JSM-6480LV), and microstructures etched by 4 vol. % nitric acid were observed on a type 9XB-PC optical microscope. The results show that the impact toughness of steel A is higher than that of steel B at the same test temperature and heat treatment technique. For steel B, the energy absorbed is, in descending order, CQ&T, Q&T and IQ&T, while for steel A, that is CQ&T, IQ&T and Q&T. The effects of heat treatment on the low temperature impact toughness are different for steels A and B, the absorbed energy changes more obviously for steel A. The results can be significant references for actual heat treatment techniques in steel plant.

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Effect of Vanadium and Boron on Microstructure and Low Temperature Impact Toughness of Bainitic Steels

Korean Journal of Materials Research ◽

10.3740/mrsk.2021.31.3.139 ◽

2021 ◽

Vol 31 (3) ◽

pp. 139-149

Author(s):

Yuanjiu Huang ◽

◽

Hun Lee ◽

Sung Kyu Cho ◽

Jun Seok Seo ◽

...

Keyword(s):

Low Temperature ◽

Impact Toughness ◽

Bainitic Steels ◽

Temperature Impact ◽

Low Temperature Impact Toughness

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Microstructural evolution and low temperature impact toughness of a Fe–13%Cr–4%Ni–Mo martensitic stainless steel

Materials Science and Engineering A ◽

10.1016/j.msea.2009.08.022 ◽

2010 ◽

Vol 527 (3) ◽

pp. 614-618 ◽

Cited By ~ 90

Author(s):

Y.Y. Song ◽

D.H. Ping ◽

F.X. Yin ◽

X.Y. Li ◽

Y.Y. Li

Keyword(s):

Stainless Steel ◽

Low Temperature ◽

Impact Toughness ◽

Microstructural Evolution ◽

Martensitic Stainless Steel ◽

Temperature Impact ◽

Low Temperature Impact Toughness

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600MPa Grade TMCP Steel with Low Yield Ratio and Excellent Weldability

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.534.51 ◽

2012 ◽

Vol 534 ◽

pp. 51-55

Author(s):

Ming Wei Tong ◽

Ze Xi Yuan ◽

Kai Guang Zhang

Keyword(s):

Low Temperature ◽

Impact Toughness ◽

Large Scale ◽

Control Process ◽

High Strength ◽

Yield Ratio ◽

Process Technology ◽

Technical Requirements ◽

Temperature Impact ◽

Low Temperature Impact Toughness

A new lower cost 600MPa TMCP steel with high strength,good low temperature impact toughness,low yield ratio and excellent weldability has been developed successfully by design of alloy composition and thermal mechanical control process technology, and the welding heat affected zone(HAZ) have been investigated. The systematic studies show that the new developed steels gather high strength, high low temperature toughness, good seismic performance(low yield ratio) and excellent weldability, and the base steels have a good match of strength and toughness. A large number of fine acicular ferrite in HAZ can ensure that the welding plate has high strength and good low temperature impact toughness. The comprehensive performance of steel can meet fully the high-technical requirements of large-scale engineering.

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