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자료유형
학술저널
저자정보
현준혁 (한국기술교육대학교) 신태우 (한국기술교육대학교) 장복수 (정우산기) 김상호 (한국기술교육대학교) 고진현 (한국기술교육대학교)
저널정보
대한용접·접합학회 대한용접·접합학회지 大韓熔接·接合學會誌 第35卷 第6號
발행연도
2017.12
수록면
89 - 95 (7page)

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The effect of post-weld heat treatment(PWHT) on microstructure, mechanical properties and pitting corrosion resistance of UNS S31803, duplex stainless steel(DSS), weld metals was investigated. Three heat inputs of 7.6, 12.5, 18.0kJ/cm were employed to make joints of DSS with E2209T1-1/4 wire and PWHT was conducted in three temperatures of 1070, 1100, 1130℃. Microstructure in weld metals after PWHT consisted of allotriomorphic rather than needle-shaped austenite. Secondary austenite was scarcely formed and intermetallic compounds were not formed. Ferrite content was increased with increasing PWHT temperatures because δ-ferrite was stable phase and ferrite can not be sufficiently transformed to austenite due to rapid cooling. The difference of Cr, Mo and Ni contents between δ-ferrite and austenite after PWHT increased compared to that before PWHT. Hardness of weld metals became lower than that of base metal after PWHT. Also, hardness of weld metals was increased while impact absorbed energy was decreased with increasing PWHT temperature because of increase of δ-ferrite content. In pitting corrosion test, the critical pitting corrosion temperature(CPT) after PWHT increased by approximately 10℃, and CPT of weld metals was between 35 and 40℃. Heat-treated specimens in 1070℃ was corroded in base metal because ferrite content of base metal was quite high over 60%.

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Abstract
1. 서론
2. 실험 방법
3. 결과 및 토의
4. 결론
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UCI(KEPA) : I410-ECN-0101-2018-581-001743509