scholarly journals Relationship between Charpy Impact Toughness and Microstructure in Heat Affected Zone of High Heat Input Low Carbon Steel Weldment

1998 ◽  
Vol 84 (2) ◽  
pp. 131-136 ◽  
Author(s):  
Yutaka KANETSUKI ◽  
Eiji IKEDA ◽  
Masaaki KATSUMATA
Keyword(s):  
Carbon Steel ◽  
Impact Toughness ◽  
Heat Affected Zone ◽  
Heat Input ◽  
Low Carbon Steel ◽  
Charpy Impact ◽  
High Heat ◽  
Low Carbon ◽  
Charpy Impact Toughness ◽  
High Heat Input

Improvement of Weld Metal Toughness in High Heat Input Electro-Slag Welding of Low Carbon Steel

2009 ◽  
Vol 53 (3-4) ◽  
pp. R57-R63 ◽  
Author(s):  
Yasushi Kitani ◽  
Rinsei Ikeda ◽  
Moriaki Ono ◽  
Kenji Ikeuchi
Keyword(s):  
Carbon Steel ◽  
Weld Metal ◽  
Heat Input ◽  
Low Carbon Steel ◽  
High Heat ◽  
Low Carbon ◽  
High Heat Input

Study of Surface Melting of Pre-Plasma Sprayed WC-14%Co Low Carbon Steel

2012 ◽  
Vol 445 ◽  
pp. 697-701
Author(s):  
M. Heydarzadeh Sohi ◽  
S. Shahbazi ◽  
A. Halvaee
Keyword(s):  
Carbon Steel ◽  
Heat Input ◽  
Low Carbon Steel ◽  
High Heat ◽  
Surface Melting ◽  
Martensite Lath ◽  
Inert Gas ◽  
Low Carbon ◽  
High Heat Input ◽  
Plasma Sprayed

In this study tungsten inert gas (TIG) surface melting of pre- plasma sprayed WC-14%Co low carbon steel has been studied. Surface melting was performed under different heat inputs by using various TIG parameters including intensity and kind of current. Microstructure and microhardness of surface alloyed specimens were then studied. Eutectic structures containing tungsten-rich carbides were shaped in a matrix including martensite lath, when high heat input was used. Decreasing at heat input affected the microstructure of the alloyed layers, and high amount of faceted tungsten-rich carbides (Fe3W3C) were formed in fairly low heat input. Microhardness of melted layers highly improved in comparison with that of the substrate.

Effects of Al, Si and N Content on the Formation of M-A Constituent and HAZ Toughness of Ti-Containing Low-Carbon Steel

2021 ◽  
Vol 1016 ◽  
pp. 42-49
Author(s):  
Kook Soo Bang ◽  
Joo Hyeon Cha ◽  
Kyu Tae Han ◽  
Hong Chul Jeong
Keyword(s):  
Carbon Steel ◽  
Impact Toughness ◽  
Low Carbon Steel ◽  
Charpy Impact ◽  
Coarse Grained ◽  
Low Carbon ◽  
N Content ◽  
Si Content ◽  
The Impact ◽  
Haz Toughness

The present work investigated the effects of Al, Si, and N content on the impact toughness of the coarse-grained heat-affected zone (CGHAZ) of Ti-containing low-carbon steel. Simulated CGHAZ of differing Al, Si, and N contents were prepared, and Charpy impact toughness was determined. The results were interpreted in terms of microstructure, especially martensite-austenite (M-A) constituent. All elements accelerated ferrite transformation in CGHAZ but at the same time increased the amount of M-A constituent, thereby deteriorating CGHAZ toughness. It is believed that Al, Si, and free N that is uncombined with Ti retard the decomposition of austenite into pearlite and increase the carbon content in the last transforming austenite, thus increasing the amount of M-A constituent. Regardless of the amount of ferrite in CGHAZ, its toughness decreased linearly with an increase of M-A constituent in this experiment, indicating that HAZ toughness is predominantly affected by the presence of M-A constituent. When a comparison of the effectiveness is made between Al and Si, it showed that a decrease in Si content is more effective in reducing M-A constituents.

Effect of Ti, Al and Mg Addition on the Impact Toughness of Heat Affected Zone in Low Carbon Steel

2009 ◽  
Vol 79-82 ◽  
pp. 143-146
Author(s):  
Jiang Hua Ma ◽  
Dong Ping Zhan ◽  
Zhou Hua Jiang ◽  
Ji Cheng He
Keyword(s):  
Carbon Steel ◽  
Impact Toughness ◽  
Heat Affected Zone ◽  
Low Carbon Steel ◽  
Optical Microscope ◽  
Carbon Steels ◽  
Low Carbon ◽  
Welding Simulation ◽  
Mg Addition ◽  
The Impact

In order to understand the effects of deoxidizer such as aluminium, titanium and magnesium on the impact toughness of heat affected zone (HAZ), three low carbon steels deoxidized by Ti-Al, Mg and Ti-Mg were obtained. After smelting, forging, rolling and welding simulation, the effects of Al, Ti and Mg addition on the impact toughness of HAZ in low carbon steel were studied. The inclusion characteristics (size, morphology and chemistry) of samples before welding and the fracture pattern of the specimens after the Charpy-type test were respectively analyzed using optical microscope and scanning electron microscopy (SEM). The following results were found. The density of inclusion in Ti-Mg deoxidized steel is bigger than Ti-Al deoxidized steel. The average diameter is decreased for the former than the latter. The addition of Ti-Mg can enhance the impact toughness of the HAZ after welding simulation. The maximal value of the impact toughness is 66.5J/cm2. The complex particles of MgO-TiOx-SiO2-MnS are most benefit to enhance impact toughness. The improvement of HAZ is attributable to the role of particle pinning and the formation of intergranular ferrite.

Nucleation Effect of Ca-Oxysulfide Inclusions of Low Carbon Steel in Heat Affected Zone by Welding

2018 ◽  
Vol 941 ◽  
pp. 130-134
Author(s):  
Yusuke Terazawa ◽  
Katsuyuki Ichimiya ◽  
Kazukuni Hase
Keyword(s):  
Carbon Steel ◽  
Heat Affected Zone ◽  
Heat Input ◽  
Fine Particles ◽  
Low Carbon Steel ◽  
Lattice Misfit ◽  
Polygonal Ferrite ◽  
Steel Plates ◽  
Low Carbon ◽  
Nucleation Effect

In order to achieve excellent toughness of heat affected zone (HAZ) of low carbon steel plates by welding, several microstructure control techniques using fine particles have been developed. In particular, Ca-oxysulfide inclusions have been used in a lot of steel plate products, because they are thermally stable even in near the fusion line of weld joint and they have grain refining effect in HAZ. In cases where heat input is large (>100kJ/cm) and microstructure of HAZ mainly consists of polygonal ferrite, it has been clarified that Ca-oxysulfide inclusions act as nucleation sites of polygonal ferrite in HAZ during the cooling process after welding. However, in cases where heat input is medium (≈50kJ/cm) and microstructure of HAZ mainly consists of bainite, nucleation effect of Ca-oxysulfide inclusions and that of mechanism have not been clarified. This study investigated the nucleation effect of Ca-oxysulfide inclusions in medium heat input welding by in-situ laser microscope observation and the lattice misfit between Fe-matrix and Ca-oxysulfide inclusions.

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