Structural Turbulence of Pearlitic Steel 09G2S at
			Low-Temperature Impact Toughness

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.

Download Full-text

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

Download Full-text

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

Download Full-text

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.

Download Full-text