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The Effect of Shielding N2 gas on The Pitting Corrosion of Seal-welded Super Austenitic Stainless Steel by Autogenous Welding

김기태|장현영|김영식
한국재료부식학회 (The Corrosion Science Society of Korea)|2017.04|CORROSION SCIENCE AND TECHNOLOGY|제16권 제2호|pp. 49-58|DOI https://doi.org/10.14773/cst.2017.16.2.49

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참고문헌

키워드

pitting corrosionsuper austenitic stainless steelautogenous GTAWseal-weldshielding nitrogen gascritical pitting temperature
주제분류금속공학

초록

Many research efforts on the effect of nitrogen on the corrosion resistance of stainless steels have beenreported, but little research has been conducted on the effect of nitrogen for the weldment of stainlesssteels by the seal-weld method. Therefore, this work focused on the determining the corrosion resistanceof tube/tube sheet mock-up specimen for sea water condensers, and elucidating the effect of shielding nitrogengas on its resistance. The pitting corrosion of autogenously welded specimen propagated preferentially alongthe dendritic structure. Regardless of the percent of shielding nitrogen gas, the analyzed nitrogen contentswere very much lower than that of the bulk specimen. This can be arisen because the nitrogen in shieldinggas may partly dissolve into the weldment, but simultaneously during the welding process, nitrogen in thealloy may escape into the atmosphere. However, the pitting resistance equivalent number (PREN) of theinterdendrite area was higher than that of the dendrite arm, regardless of the shielding gas percent; andthe PREN of the interdendrite area was higher than that of the base metal; the PREN of the dendrite armwas lower than that of the base metal because of the formation of (Cr, Mo) rich phases by welding.

Abstract

Many research efforts on the effect of nitrogen on the corrosion resistance of stainless steels have beenreported, but little research has been conducted on the effect of nitrogen for the weldment of stainlesssteels by the seal-weld method. Therefore, this work focused on the determining the corrosion resistanceof tube/tube sheet mock-up specimen for sea water condensers, and elucidating the effect of shielding nitrogengas on its resistance. The pitting corrosion of autogenously welded specimen propagated preferentially alongthe dendritic structure. Regardless of the percent of shielding nitrogen gas, the analyzed nitrogen contentswere very much lower than that of the bulk specimen. This can be arisen because the nitrogen in shieldinggas may partly dissolve into the weldment, but simultaneously during the welding process, nitrogen in thealloy may escape into the atmosphere. However, the pitting resistance equivalent number (PREN) of theinterdendrite area was higher than that of the dendrite arm, regardless of the shielding gas percent; andthe PREN of the interdendrite area was higher than that of the base metal; the PREN of the dendrite armwas lower than that of the base metal because of the formation of (Cr, Mo) rich phases by welding.

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