Effect of Nitorogen Content on the Low Temperature Mechanical Properties of Type 304 Austenitic Staninless Steel Weld Metals(Materials, Metallurgy & Weldability)

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High-nitrogen austenitic stainless steel weld metals are obtained by using type 304 electrode wire (1.6mmφ) and N_2-Ar mixture shielding gas. Low temperature tensile and impact tests on deposited metals are carried out at test temperature range from 0℃ to -196℃. The main experimental results are summarized as fellow: Nitrogen content of weld metals increase considerably with increasing of N_2 volume percent in shielding gas, then at 100% N_2 shielding, nitrogen contents show the about 0.2wt%. A cast structure contained δ-ferrite is obserbed in the weld metal as weld condition but content of δ-ferrite decrease with inceasing nitrogen content of weld metals. There is no δ-ferrite in the weld metals which contained about 0.18wt% nitrogen. 0.2% proof stress increase with incresing of nitrogen content of weld metals. This tendency is obserbed clearly as the test temperature depression, and this behavior is discussed by bearing on the strain-induced martensitic transformation in the weld metal at low test temperature. The tensile strength of weld matals increase as the test temperature depression but is not changed by nitrogen content of specimens. At impact test, the absorbed energy of weld metals slightly increase with increasing of nitrogen content of weld metals. The effect of nitrogen on the absorbed energy of high-nitrogen weld metal is changed by welding method and source of nitrogen to weld metals. It is know that high-nitrogen type 304 austenitic stainless steel weld metals hold a high proof stress without decreasing of the toughness at low test temperature.
大阪大学の論文

Effect of Nitorogen Content on the Low Temperature Mechanical Properties of Type 304 Austenitic Staninless Steel Weld Metals(Materials, Metallurgy & Weldability)

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