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Meeting 2021 TMS Annual Meeting & Exhibition
Symposium Materials Processing Fundamentals
Presentation Title Effect of Nitrogen on Weldability and the Microstructure in Laser Beam Welding of Duplex Stainless Steel
Author(s) Yunxing Xia, Kenshiro Amatsu, Fumikazu Miyasaka, Hiroaki Mori
On-Site Speaker (Planned) Yunxing Xia
Abstract Scope Due to unbalanced phases' contents in welds of duplex stainless steel, their mechanical properties, and corrosion resistance should be remarkably degraded from base metals' ones. It was reported that both the precipitation and growth of the austenite phase in the welds are affected by the nitrogen contents as well as thermal cycles of welding. Especially, in the case of laser beam welding (LBW), these effects might be drastically changed as compared with them in conventional welding methods. From the microstructure observation in the LB welds used Argon shielding gases varied with nitrogen contents of 0%, 10%, and 20%, austenite phases growth at grain boundaries were promoted by the increase in nitrogen contents in the shielding gases. Based on elements' distributions measured in the previous report by an EPMA analysis, nitrogen was powerfully concentrated in austenite in each case. In addition, the in-situ observation by the micro-focused X-ray transmission imaging system revealed that porosity in the LB welds was suppressed by the increase of nitrogen in Argon shielding gases. That is, these results suggested that under suitable thermal history conditions, the addition of nitrogen in Argon shielding gas for LBW might be effective to increase in austenite contents in welds of duplex stainless steels.
Proceedings Inclusion? Planned:


Carbothermal Reduction of Brazilian Linz Donawitz-LD Steel Sludges
Computational Fluid Dynamics Modeling of Damped Oscillations of Molten Metal Droplets
Contactless Inductive Flow Tomography for Control of Liquid Metal Flow with Electromagnetic Actuators
Containerless Materials Processing for Materials Science on Earth and in Space
Cylindrical and Planar Magnetron Sputtering for Microstructural Control
Effect of Dissolution of Titanium Ions on Ti Alloys Electrodeposition from EMIC-AlCl3 Ionic Liquid at Low Temperature
Effect of Nitrogen on Weldability and the Microstructure in Laser Beam Welding of Duplex Stainless Steel
Effect of Slag Conductivity on Decarburisation Reaction Kinetics
Experimental Characterization of Liquid Metal Bubble-driven Flows Modeling the Situation in a Steel Ladle
Influence of Slab Transportation and Handling Practice on Crack Sensitivity of Micro-alloyed Steels
Liquid-liquid Extraction Thermodynamic Parameter Estimator (LLEPE) for Multicomponent Separation Systems
Low Temperature Aluminothermic Reduction of Metal Oxides
Modelling of Metal Loss in Ferromanganese Furnace Tapping Operations
Numerical Simulation of the Influence of Particle Physical Properties on Flow Field during the Aeration Leaching Process
Stress Development Simulation in Continuously Cast Steel Slabs during Cooling Process
The Role of Copper in Combustion Processes
Thermodynamic Examination of Quaternary Compounds in the Ag–Fe–(Ge, Sn)–Se Systems by the Solid-state EMF Method
Thermodynamic Modeling of Iron-copper-sulfuric Acid Solutions during Solvent Extraction and Electrowinning for Copper Production
X-ray and Neutron Radiographic Experiments on Particle-laden Molten Metal Flows

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