Correlation Between HAZ Microstructure and Low Temperature Impact Toughness of Bainitic Steel Plates

Lee, Hun; Cho, Sung Kyu; Choi, Woo Hyuk; Kim, Yang Gon; Kwon, Youngmee; Lee, Jung Gu; Shin, Sang Yong; Choi, Dong Ki

doi:10.5781/jwj.2021.39.3.5

Cited by 5 publications

(2 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, more discussion should be carried out for detailed understanding the influence of Ti, Nb precipitates, since previous studies have confirmed the side effect of grain refinement in high heat input welding owing to the increasing fraction of grain boundary ferrite, which can have a negative influence on impact toughness 24) . It was also reported that bainitic ferrite may contribute to the toughness drop in the CGHAZ 25,26) . Fig.…”

Section: Resultsmentioning

confidence: 90%

A Study on the Microstructure and Mechanical Properties of the Coarse Grain Heat Affected Zone in EH40 Grade High Strength Structural Steels

Jeong¹,

Hong²,

Seo³

et al. 2022

J Weld Join

View full text Add to dashboard Cite

In this paper, the effect of the electro gas arc welding (EGW) process with a heat input of 600 kJ/cm on the microstructural and mechanical characteristics was investigated for two types of EH40 high strength hull structural steels, containing Ti and Nb. The coarse grain heat affected zone (CGHAZ), with a peak temperature of 1450 °C, was simulated for both alloys using a material thermal cycle simulator. Tensile and Charpy impact toughness tests were performed to determine the mechanical properties of the CGHAZ, and microstructural analysis was performed using scanning electron microscopy and transmission electron microscopy. Both alloys exhibited a significant loss of impact toughness because of the welding thermal cycle, causing the formation of a brittle phase and the growth of precipitates. The experimental results indicated that although the addition of Ti and Nb had several benefits on mechanical properties, this might be unsuitable for the EGW process owing to the resulting deterioration in impact toughness.

show abstract

Section: Resultsmentioning

confidence: 90%

A Study on the Microstructure and Mechanical Properties of the Coarse Grain Heat Affected Zone in EH40 Grade High Strength Structural Steels

Jeong¹,

Hong²,

Seo³

et al. 2022

J Weld Join

View full text Add to dashboard Cite

show abstract

“…The HAZ comprises coarse-grained HAZ (CGHAZ), ne-grained HAZ (FGHAZ), and intercritical HAZ (ICHAZ) away from the fusion line of the WM [28][29][30][31][32][33]. The CGHAZ and FGHAZ were composed primarily of martensite (M) and bainite (B) owing to rapid cooling from the peak temperature of the full austenite region.…”

Section: Microstructural Behaviours Of Transverse Welds Under Various...mentioning

confidence: 99%

Overcoming underfill defect with undermatching filler and establishing new acceptance criteria for underfill depth in laser beam welding of ultra-high strength steels

Lee,

Park,

Seon

et al. 2023

Preprint

View full text Add to dashboard Cite

This study investigated the laser-beam-weld geometry and tensile properties under various butt-joint gap conditions for 2.3-mm thick ultra-high strength steels (UHSSs) as function of the use of undermatching filler. An undermatching filler wire having a yield strength of 430 MPa was used to overcome the underfill. Without the filler, the tensile properties were acceptable under a gap of up to 0.2 mm, which is less than 10% of the base metal (BM) thickness. With the filler, the gap tolerance increased to 0.5 mm, and the undermatching filler was proven to overcome the underfill issue. The underfill-depth acceptance criterion for realising good tensile properties was defined as 0.39 mm (= 17% of UHSSs’ thickness), which was significantly higher than the currently defined American Welding Society specification (7% of UHSSs’ thickness). These optimisation criteria can be used as guidelines for the butt joints of laser beam welding in UHSSs.

show abstract

Alleviation of Hydrogen Embrittlement to Delay Effective Hydrogen Diffusion Against MA Constituent Formation Due to Mo Solutes for 420 MPa Grade Offshore Steels

et al. 2022

View full text Add to dashboard Cite

Correlation Between HAZ Microstructure and Low Temperature Impact Toughness of Bainitic Steel Plates

Cited by 5 publications

References 12 publications

A Study on the Microstructure and Mechanical Properties of the Coarse Grain Heat Affected Zone in EH40 Grade High Strength Structural Steels

A Study on the Microstructure and Mechanical Properties of the Coarse Grain Heat Affected Zone in EH40 Grade High Strength Structural Steels

Overcoming underfill defect with undermatching filler and establishing new acceptance criteria for underfill depth in laser beam welding of ultra-high strength steels

Alleviation of Hydrogen Embrittlement to Delay Effective Hydrogen Diffusion Against MA Constituent Formation Due to Mo Solutes for 420 MPa Grade Offshore Steels

Contact Info

Product

Resources

About