Weldability of High Nitrogen Austenitic Stainless Steel Report 1 : Nitrogen Absorption of 316L Type Stainless Steel Welds in Extreme Environments(Materials, Metallurgy & Weldability)

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Nitrogen absorption of 316L weld metal by high pressure GMA(constant arc length condition ) process was investigated. The welding atmospheres were prepareted by pressurized N_2 and N_2-CO_2 gas mixture. Also, the behavior of nitrogen in remelted weld metal containing high nitrogen and change of microstructure of welded were observed. The nitrogen content increased with increasing partial pressure of N_2. 0.60wt.% of nitrogen was absorbed in weld metal at 6.0MPA N_2 atmosphere. But this was very lower content than equilibrium solubility of 316L stainless steels at close to melting point. Nitrogen content in weld metal under pressurized N_2-CO_2 mixture atmosphere was different from pure N_2 atmosphere. The gas composition consists of PN_<2-> ; 0.35MPA-P_<co2> ; 0.05MPa (total pressure ; 0.4MPa), it showed that maximum nitrogen content of O.56wt.%.
大阪大学の論文