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GTAW에 의한 스테인리스강 용접부위의 부식특성에 관한 전기화학적 평가
문경만(Kyung-Man Moon),이규환(Kyu-Hwan Lee),김진경(Jin-Gyeong Kim) 한국마린엔지니어링학회 2010 한국마린엔지니어링학회지 Vol.34 No.4
STS304와 22APU 스테인리스강에 가스 텅스텐 아크용접을 하였다. 이 경우 두 강의 용접부의 부식특성을 전기화학적 방법으로 검토하였다. STS304 용접금속의 경도(Hv-250)는 22APU 강 (Hv-217) 보다 상대적으로 높은 값을 보였다. 22APU의 용접금속과 STS 304의 열영향부의 부식전류밀도는 다른 용접부위와 비교하여 각각 높은 값이 관찰 되었으며, 이것은 예민화 온도 영역에 있는 STS304의 열영향부와 22APU의 용접금속에 형성된 크롬탄화물로 크롬결핍이 더욱 활성태의 양극으로 쉽게 부식된 것에 기인하는 것으로 사료된다. 그리고 이들 두 강의 용접금속과 열영향부는 크롬결핍상태에 있는 입자 사이 경계의 선택부식으로 입계부식을 나타내었다. 결과적으로 다른 용접방법의 적용이나 적절한 용접봉 사용은 두 강의 용접부에 대한 내식성을 개선하기 위해서 필요한 것으로 사료된다. GTAW was carried out to the austenitic 304(STS 304) and 22 APU stainless steels. In this case, difference of the corrosion characteristics of welded zone with STS 304 and 22APU mentioned above was investigated with electrochemical methods. Vickers hardness of weld metal in case of STS 304 (Hv-250) showed a relatively higher value than this of 22 APU(Hv-217). The corrosion current densities of weld metal of 22APU and heat affected zone of STS 304 were observed at the highest value compared to those of other welding zone respectively. This is probably because chromium depletion field due to chromium carbide formed to weld metal of 22APU and to heat affected zone of STS 304 can preferentially easily be corroded with more active anode than other fields. Consequently it is thought that application of the other welding methods like as laser welding or using of the optimum filler metals is necessary to improve the corrosion resistance of welding parts of these steels.
Laser 용접한 스테인리스강의 용접부위의 부식특성에 관한 평가
문경만(Kyung-Man Moon),원종필(Jong-Pil Won),박동현(Dong-Hyun Park),김윤해(Yun-Hae Kim),이명훈(Myung-Hoon Lee),김진경(Jin-Gyeong Kim) 한국해양공학회 2012 韓國海洋工學會誌 Vol.26 No.4
Laser welding was carried out on austenitic 304 (STS 304) and 2 APU stainless steels. In this case, the differences between the corrosion caracteristics of th welding zones of the two stainless steels were investigated using electrochemical methods. The Vickers hardness values of the weld metal (WM) zones in both cases, the STS 304 and 22 APU stainless steels, showed relatively higher values than those of other welding zones. The corrosion current densities of the heat affected zone (HAZ) of the 22 APU and the base metal (BM) zone of the STS 304 exhibited the highest values compared to the other welding zones. It is generally accepted that whe STS 304 stainless steel is welded using a general welding method, intergranular corrosion is often observed at the grain boundary because of its chromium depletion area. However, when laser welding was performed on both the STS 304 and 22 APU stainless steels, no intergranular corrosion was observed at any of the welding zones. Consequently, it is considered that the intergranular corrosion of stainless steel can be controlled with the application of laser welding.
304 스테인리스강의 용접부위의 부식특성에 관한 전기화학적 평가
문경만(Kyung-Man Moon),김윤해(Yun-Hae Kim),김종도(Jong-Do Kim),이명훈(Myung-Hoon Lee),김진경(Jin-Gyeong Kim) 한국해양공학회 2009 韓國海洋工學會誌 Vol.23 No.4
Two kinds of welding methods are used for austenitic 304 stainless steel: laser welding and TIG welding. The difference in the corrosion characteristics if the welded zone between these two welding methods was investigated using electrochemical methods, such as corrosion potential measurements, polarization curves, cyclic voltammograms, etc. The Vickers hardnesses if all the welded zones (WM: Weld Metal, HAZ: Heat Affected Zone, BM: Base Metal) showed relatively higher values in the case if laser welding than for TIG welding. Furthermore, the corrosion current densities if all the welding zones showed lower values compared to TIG welding. In particular, the corrosion current density if the HAZ with TIG welding had the highest value if all the welding zones, which suggests that chromium depletion due to the formation if chromium carbide appears in the HAZ, which is in the range of the sensitization temperature. Thus, it can easily be corroded with a more active anode. Consequently, we found that the corrosion resistance if all of the welding zones for austenitic 304 stainless steel could apparently be improved by using Loser welding.