질소 보호 가스 첨가가 하이퍼 듀플렉스 스테인리스 밀봉용접재의마모부식 저항성에 미치는 영향

김혜진; 박용수; 전순혁; 김순태; 이인성

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자료유형: 학술저널

저자정보: 김혜진 박용수 전순혁 김순태 이인성

저널정보: 한국부식방식학회 Corrosion Science and Technology Corrosion Science and Technology 제13권 제2호

발행연도: 2014.1

수록면: 70 - 80 (11page)

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이 논문의 연구 히스토리 (2)

2014

아르곤 보호가스에 질소 가스첨가가 하이퍼 듀플렉스 스테인리스 밀봉용접재의 입계부식과 마모부식 저항성에 미치는 영향

김혜진 신소재공 2014.01 학위논문

질소 보호 가스 첨가가 하이퍼 듀플렉스 스테인리스 밀봉용접재의마모부식 저항성에 미치는 영향

김혜진 , 박용수 , 전순혁 외 2명 Corrosion Science and Technology 2014.01 학술저널

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Duplex stainless steels with nearly equal fraction of the ferrite(α) phase and austenite(γ) phase have beenincreasingly used for various applications such as power plants, desalination facilities due to their highresistance to corrosion, good weldability, and excellent mechanical properties. Hyper duplex stainless steel(HDSS) is defined as the future duplex stainless steel with a pitting resistance equivalent (PRE=wt.%Cr+3.3(wt.%Mo+0.5wt.%W)+30wt.%N) of above 50. However, when HDSS is welded with gas tungstenarc (GTA), incorporation of nitrogen in the Ar shielding gas are very important because the volume fractionof α-phase and γ-phase is changed and harmful secondary phases can be formed in the welded zone. Inother words, the balance of corrosion resistance between two phases and reduction of Cr2N are the keypoints of this study. The primary results of this study are as follows. The addition of N2 to the Ar shieldinggas provides phase balance under weld-cooling conditions and increases the transformation temperature ofthe α-phase to γ-phase, increasing the fraction of γ-phase as well as decreasing the precipitation of Cr2N. In the anodic polarization test, the addition of nitrogen gas in the Ar shielding gas improved values ofthe electrochemical parameters, compared to the Pure Ar. Also, in the erosion-corrosion test, the HDSSwelded with shielding gas containing N2 decreased the weight loss, compared to HDSS welded with theAr pure gas. This result showed the resistance of erosion-corrosion was increased due to increasing thefraction of γ-phase and the stability of passive film according to the addition N2 gas to the Ar shieldinggas. As a result, the addition of nitrogen gas to the shielding gas improved the resistance of erosion-corrosion.

#hyper duplex stainless steel #TIG Welding #Cr2N #potentiodynamic #erosion-corrosion

참고문헌 (19)

참고문헌 신청

/ / ASTM E562?02, Standard test method for determining volume fraction by systematic manual point count / Annual Book of ASTM Standards

/ / Annual Book of ASTM Standards, ASTM G 5 / ASTM G 5

/ / TCS 2006 TCFE5-TCS Steels/Fe-Alloys Database, v5.0 / Thermo-Calc Software

A. Neville / 1995 / / Wear (186-187) : 497 ~

B. A. Sprengard / 2011 / Effect of nitrogen concentration in shielding gas on microstructure and mechanical properties of ATI 2003 lean duplex stainless steel autogenou plasma Ar welding