The Nature of Acicular Ferrite in Ferrous Weld Metals and the Challenges for Microstructure Modelling

2003 ◽  
Vol 426-432 ◽  
pp. 4019-4026 ◽  
Author(s):  
G. Thewlis
Keyword(s):  
Acicular Ferrite ◽  
Weld Metals

Crystallographic analysis for acicular ferrite formation in low carbon steel weld metals

2014 ◽  
Vol 29 (4) ◽  
pp. 254-261 ◽  
Author(s):  
Atsushi Takada ◽  
Yu-Ichi Komizo ◽  
Hidenori Terasaki ◽  
Tomoyuki Yokota ◽  
Kenji Oi ◽  
...  
Keyword(s):  
Carbon Steel ◽  
Acicular Ferrite ◽  
Low Carbon Steel ◽  
Crystallographic Analysis ◽  
Steel Weld ◽  
Low Carbon ◽  
Ferrite Formation ◽  
Weld Metals

Effect of Ti-containing inclusions on the nucleation of acicular ferrite and mechanical properties of multipass weld metals

Micron ◽  
2013 ◽  
Vol 45 ◽  
pp. 107-114 ◽  
Author(s):  
M. Fattahi ◽  
N. Nabhani ◽  
M. Hosseini ◽  
N. Arabian ◽  
E. Rahimi
Keyword(s):  
Mechanical Properties ◽  
Acicular Ferrite ◽  
Weld Metals ◽  
Multipass Weld

scholarly journals Microstructure features and formation mechanism in a newly developed electroslag welding

2021 ◽  
Author(s):  
Tomonori Kakizaki ◽  
Shodai Koga ◽  
Hajime Yamamoto ◽  
Yoshiki Mikami ◽  
Kazuhiro Ito ◽  
...  
Keyword(s):  
Low Temperature ◽  
Weld Metal ◽  
Heat Input ◽  
Acicular Ferrite ◽  
Charpy Impact ◽  
Electroslag Welding ◽  
Weld Metals ◽  
Columnar Grains ◽  
Cooling Speed ◽  
Low Temperature Toughness

AbstractElectroslag welding (ESW) is known to show higher heat input than electrogas welding (EGW), resulting in poor low-temperature toughness. However, a newly developed ESW (dev. ESW) method using low-resistivity slag bath exhibited excellent low-temperature toughness as a result of lower effective heat input than conventional EGW, as demonstrated by the faster cooling rates measured in weld metals and estimated using finite element method analyses. This led to much shallower molten pool in the dev. ESW, resulting in much finer columnar grains and thinner centerline axial grains. High cooling speed in the dev. ESW method appeared to contribute to increased acicular ferrite proportion. The uniform microstructure with large acicular ferrite proportion and small number of inclusions in the weld metal permitted the dev. ESW weld metal to possess little variation in Charpy impact energy across the center of weld metal.

scholarly journals The influence of the oxygen equivalent in a gas-mixture on the structure and toughness of microalloyed steel weldments

2006 ◽  
Vol 71 (3) ◽  
pp. 313-321 ◽  
Author(s):  
Radica Prokic-Cvetkovic ◽  
Andjelka Milosavljevic ◽  
Aleksandar Sedmak ◽  
Olivera Popovic
Keyword(s):  
Impact Toughness ◽  
Crack Propagation ◽  
Weld Metal ◽  
Acicular Ferrite ◽  
Microalloyed Steel ◽  
Gas Mixtures ◽  
Gas Mixture ◽  
Weld Metals ◽  
Maximum Crack ◽  
The Impact

Testing were carried out on two steels. The first was microalloyed with Nb and second with Ti, Nb and V. The impact toughness of weld metals of these steels was evaluated using an instrumented Charpy pendulum. Five different gas mixtures (Ar, CO2, O2) were used to determine the optimal gas shielded metal arc process for both steels. The oxygen equivalent was used as a representative parameter of a mixture to follow, in particularly, its effect on the microstructure, toughness and crack propagation energy of the weld metal. For these investigated steels, the optimum gas mixture was established (5%CO2, 0.91%O2, balance Ar), which provided the maximum crack propagation energy, due to the microstructure which consisted dominantly of acicular ferrite.

The origin of transformation textures in steel weld metals containing acicular ferrite

1991 ◽  
Vol 22 (3) ◽  
pp. 657-663 ◽  
Author(s):  
A. O. Kluken ◽  
Ø. Grong ◽  
J. Hjelen
Keyword(s):  
Acicular Ferrite ◽  
Steel Weld ◽  
Weld Metals

scholarly journals A study on the acicular ferrite formation in steel weld metals for gas metal arc welding

2020 ◽  
Vol 38 (2) ◽  
pp. 6s-10s
Author(s):  
Kyohei Uto ◽  
Koyo Nakayama ◽  
Yuji Kisaka ◽  
Fumiaki Kimura ◽  
Hidenori Terasaki
Keyword(s):  
Acicular Ferrite ◽  
Arc Welding ◽  
Gas Metal Arc Welding ◽  
Steel Weld ◽  
Ferrite Formation ◽  
Weld Metals ◽  
Metal Arc Welding
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