scholarly journals Effect of High Heat Input on Toughness and Microstructure of Coarse Grain Heat Affected Zone in Zr Bearing Low Carbon Steel

2014 ◽  
Vol 54 (4) ◽  
pp. 932-937 ◽  
Author(s):  
Minghao Shi ◽  
Pengyan Zhang ◽  
Chao Wang ◽  
Fuxian Zhu
Keyword(s):  
Carbon Steel ◽  
Heat Affected Zone ◽  
Heat Input ◽  
Low Carbon Steel ◽  
High Heat ◽  
Coarse Grain ◽  
Low Carbon ◽  
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.

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.

scholarly journals Effect of Ferritic Morphology on Yield Strength of CGHAZ in a Low Carbon Mo-V-N-Ti-B Steel

Metals ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 1863
Author(s):  
Leping Wang ◽  
Huibing Fan ◽  
Genhao Shi ◽  
Qiuming Wang ◽  
Qingfeng Wang ◽  
...  
Keyword(s):  
Yield Strength ◽  
Heat Input ◽  
Low Carbon Steel ◽  
High Heat ◽  
Coarse Grained ◽  
Granular Bainite ◽  
Low Carbon ◽  
Fine Grained ◽  
High Heat Input ◽  
The Impact

For investigating the impact of ferritic morphology on yield strength (YS) of the high-heat-input welding induced coarse-grained heat-affected zone (CGHAZ) of a low carbon Mo-V-N-Ti-B steel, a group of particular welding heat inputs were designed to obtain different ferritic microstructures in CGHAZ. The tensile properties were estimated from typical samples with ferritic microstructures. The mixed microstructures dominated by the intragranular polygonal ferrite (IGPF), the intragranular acicular ferrite (IGAF), and the granular bainite (GB) were obtained at the heat inputs of 35, 65, 85 and 120 kJ/cm, respectively. When the main microstructure changed from IGPF to IGAF and GB, YS increased first and then decreased. The microstructure consisting mainly of IGAF possessed the maximum YS. As the main microstructure changed from IGPF to IGAF and GB, the contribution of grain refinement strengthening to YS was estimated to be elevated remarkably. This means the strength of CGHAZ in a low-carbon steel subjected to the high-heat-input welding could be enhanced by promoting the fine-grained AF and GB formation.

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