The Effect of Aging Treatment on the Corrosion Resistance in Super Duplex Stainless Steel with Added W

J. Ocean Eng. Technol. 2009;23(6):87-92.

Kim Soo-Chun,Choi Han-Gul,Kim Yun-Kyu,Park Young-Tae,Lee Jong-Mun,Park Jin-Hwan,Kang Chang-Yong

Dept. of Metallurgical Engineering Pukyong National University,Dept. of Metallurgical Engineering Pukyong National University,Dept. of Metallurgical Engineering Pukyong National University,Dept. of Metallurgical Engineering Pukyong National University

텅스텐이 첨가된 슈퍼 2상 스테인리스강의 내식성에 미치는 시효처리의 영향

김수천,최한글,김윤규,박영태,이종문,박진환,강창룡

부경대학교 신소재공학부,부경대학교 신소재공학부,부경대학교 신소재공학부,부경대학교 신소재공학부,부경대학교 신소재공학부,부경대학교 화학공학부,부경대학교 신소재공학부

Keywords: Super duplex stainless steel, Substitution of W, Corrosion resistance, Sigma phase, Aging treatment

핵심용어: 슈퍼 2상 스테인리스강, 텅스텐의 치환, 내식성, $sigma$상, 시효처리

Abstract

The effect of aging on the precipitation of the $sigma$ phase and the corrosion resistance in tungsten substituted super duplex stainless steels was investigated. The volume fraction of the $sigma$ phase and the current density increased with aging at temperatures up to $750^{circ}C$ and then decreased. With an increase in aging time, the volume fraction of the $sigma$ phase and the current density also increased. The $sigma$ phase hardly influenced the corrosion resistance. With the substitution of tungsten for molybdenum in super duplex stainless steel, the volume fraction of the $sigma$ phase and the current density decreased remarkably.