Microstructure and Tensile Behaviors of Laser-Arc Hybrid Welds Comparing to Submerged Arc Welds of High-Manganese Steel for Cryogenic Applications

The weldability and the relationship between microstructure and tensile properties at 298 and 110 K produced by laser-arc hybrid welding (LAHW) in high-Mn steel welds were thoroughly investigated. In the laser zone of LAHWs using filler wire, more Mn vaporization in the laser zone was observed than...

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Published inKorean Journal of Metals and Materials Vol. 63; no. 1; pp. 33 - 42
Main Authors Choi, Myeonghwan, Lee, Kwang-Hyeon, Cho, Dae-Won, Kang, Namhyun
Format Journal Article
LanguageEnglish
Published 대한금속·재료학회 01.01.2025
Subjects
재료공학
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ISSN1738-8228
2288-8241
DOI10.3365/KJMM.2025.63.1.33

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Abstract The weldability and the relationship between microstructure and tensile properties at 298 and 110 K produced by laser-arc hybrid welding (LAHW) in high-Mn steel welds were thoroughly investigated. In the laser zone of LAHWs using filler wire, more Mn vaporization in the laser zone was observed than at the arc zone of LAHWs. The arc zone showed a decrease in Mn content of ~0.6 wt%, while the laser zone showed a decrease of ~0.9 wt%. The arc and laser zones of the LAHWs showed stacking fault energies (SFEs) of 17.8 and 17.3 mJ/m², respectively. The tensile deformation of LAHWs at 298 K was conducted with a deformation twins mode, while it was shifted to deformation twins + ε-martensite transformation at 110 K. The yield strength was slightly higher in the laser zone, which had a finer grain size compared to the arc zone. The formation of ε-martensite with deformation twins preceded necking during tensile testing, therefore increasing the yield strength at 110 K. In terms of performance, the LAHW process demonstrated a 25% increase in productivity compared to the conventional submerged arc welding (SAW) process, with a yield strength exceeding 400 MPa, comparable to that of SAW. These findings indicate that LAHW is a highly effective welding method for high-Mn steels, particularly in cryogenic applications.
AbstractList The weldability and the relationship between microstructure and tensile properties at 298 and 110 K produced by laser-arc hybrid welding (LAHW) in high-Mn steel welds were thoroughly investigated. In the laser zone of LAHWs using filler wire, more Mn vaporization in the laser zone was observed than at the arc zone of LAHWs. The arc zone showed a decrease in Mn content of ~0.6 wt%, while the laser zone showed a decrease of ~0.9 wt%. The arc and laser zones of the LAHWs showed stacking fault energies (SFEs) of 17.8 and 17.3 mJ/m², respectively. The tensile deformation of LAHWs at 298 K was conducted with a deformation twins mode, while it was shifted to deformation twins + ε-martensite transformation at 110 K. The yield strength was slightly higher in the laser zone, which had a finer grain size compared to the arc zone. The formation of ε-martensite with deformation twins preceded necking during tensile testing, therefore increasing the yield strength at 110 K. In terms of performance, the LAHW process demonstrated a 25% increase in productivity compared to the conventional submerged arc welding (SAW) process, with a yield strength exceeding 400 MPa, comparable to that of SAW. These findings indicate that LAHW is a highly effective welding method for high-Mn steels, particularly in cryogenic applications.
The weldability and the relationship between microstructure and tensile properties at 298 and 110K produced by laser-arc hybrid welding (LAHW) in high-Mn steel welds were thoroughly investigated. In thelaser zone of LAHWs using filler wire, more Mn vaporization in the laser zone was observed than at the arczone of LAHWs. The arc zone showed a decrease in Mn content of ~0.6 wt%, while the laser zone showeda decrease of ~0.9 wt%. The arc and laser zones of the LAHWs showed stacking fault energies (SFEs) of 17.8and 17.3 mJ/m², respectively. The tensile deformation of LAHWs at 298 K was conducted with a deformationtwins mode, while it was shifted to deformation twins + ε-martensite transformation at 110 K. The yieldstrength was slightly higher in the laser zone, which had a finer grain size compared to the arc zone. Theformation of ε-martensite with deformation twins preceded necking during tensile testing, thereforeincreasing the yield strength at 110 K. In terms of performance, the LAHW process demonstrated a 25%increase in productivity compared to the conventional submerged arc welding (SAW) process, with a yieldstrength exceeding 400 MPa, comparable to that of SAW. These findings indicate that LAHW is a highlyeffective welding method for high-Mn steels, particularly in cryogenic applications. KCI Citation Count: 0
Author Kang, Namhyun
Cho, Dae-Won
Lee, Kwang-Hyeon
Choi, Myeonghwan
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Snippet The weldability and the relationship between microstructure and tensile properties at 298 and 110 K produced by laser-arc hybrid welding (LAHW) in high-Mn...
The weldability and the relationship between microstructure and tensile properties at 298 and 110K produced by laser-arc hybrid welding (LAHW) in high-Mn steel...
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Title Microstructure and Tensile Behaviors of Laser-Arc Hybrid Welds Comparing to Submerged Arc Welds of High-Manganese Steel for Cryogenic Applications
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