オーステナイト系ステンレス鋼溶接金属の鋭敏化挙動に及ぼすδフェライトの影響

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Sensitization behavior of the delta-ferrite containing stainless steel weld metal was investigated using Type 304 and Type 308 alloys with the carbon content ranging from 0.04% to 0.09%, respectively. The weld metals heat treated at 923 K for times varying between 1 sec and 100 hr were tested for intergranular corrosion susceptibility in the acidified copper sulfate solution. The delta ferrite containing weld metal with lower carbon content indicated rapidly healing of sensitization after the short heat treatment, whereas ones with higher carbon content than a critical value behaved as a fully austenitic steel regardless the existence of ferrite without showing the sign of rapid healing. SEM observation revealed that M_<23>C_6 precipitated preferentially at the ferrite-austenite boundary and also at the austenite-austenite boundaries although its amount at the latter boundaries was much less than the other in the both weld metals which indicated rapid healing of sensitization and behaved as a fully austenitic steel. A mathematical model is developed for the sensitization of the ferrite containing austenitic stainless steel weld metal. The degree of sensitization calculated using this model has shown a good agreement with the experimental corrosion test results. The calculation also demonstrated that for a given carbon content there exist the critical values for not only the total amount but the thickness of ferrite, above which the weld metal develop the rapid healing of sensitization.
1991-08-05

オーステナイト系ステンレス鋼溶接金属の鋭敏化挙動に及ぼすδフェライトの影響

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