슈퍼듀플렉스 STS의 GTAW에서 질소 침투에 관한 플라즈마 스트림 모델 개발
- Abstract
- Duplex stainless steel, Ferrite phase of stress corrosion cracking resistance and austenite phase of high strength combined by 1:1, is attention material recently of highly corrosion resistance and high strength. It was 1.7 times higher than austenite stainless steel(STS).
Pitting resistance equivalent number(PREN) is numerical index to evaluate for corrosion resistance for STS. PREN is more than 30 or 40 can use in coastal area or in high corrosion area of nuclear power, desulfurization, sea water and chemical plant.
Super duplex stainless steel of PREN 40 over, it made material by adding Mo and N, has been steadily increasing utilization in various field of seawater cooling, desalination , desulfurization, chemical plant, nuclear spent fuel storage and transfer container CASK.
In this study discussed about effect of adding nitrogen in shield gas on PREN of weld metal in Super duplex stainless steel TIG welding.
The mechanism of nitrogen permeation into weld metal did not define model of nitrogen ion permeation with electrical action by glow discharge. It defined model of nitrogen ion permeation with physical action by arc plasma stream.
- Issued Date
- 2013
- Awarded Date
- 2013. 2
- Type
- Dissertation
- Publisher
- 부경대학교
- Affiliation
- 부경대학교 대학원
- Department
- 대학원 신소재시스템공학과
- Advisor
- 조상명
- Table Of Contents
- 목 차
Abstract ··························································································· ··· 1
제 1 장 서 론 ······················································································· 2
1.1 연구 배경 및 필요성 ······································································· 2
1.2 연구 목적 및 개요 ·········································································· 3
제 2 장 이론적 배경 ·············································································· 4
2.1 GTAW process ············································································· 4
2.1.1 GTAW의 정의 ··········································································· 5
2.1.2 GTAW의 원리 ··········································································· 5
2.1.3 용접의 아크 특성 ······································································· 6
2.1.4 GTAW의 장단점 ······································································ 10
2.2 GTAW 용접기 및 재료 ·································································· 11
2.2.1 용접기······················································································ 11
2.2.2 용접토치 ·················································································· 13
2.2.3 용접재료··················································································· 14
2.3 아크 압력에 관한 연구 동향 ··························································· 16
2.3.1 아크 압력의 발생 ······································································ 17
제 3 장 용접금속 내 질소 침투의 모델 제안 ···················································· 19
3.1 서언 ····························································································· 19
3.2 기존의 모델 ·················································································· 20
3.2.1 Gas-Metal 시스템에서 용접금속 내 질소 침투 ····························· 21
3.2.2 Gas-Plasma 시스템에서 용접금속 내 질소 침투 ··························· 22
3.2.3 용접금속 내 질소 침투의 개선된 모델 제안 ·································· 24
제 4 장 용접금속 내 질소 침투에 관한 기초실험 ···································· 27
4.1 서언 ····························································································· 27
4.2 실험 재료 및 방법 ········································································· 28
4.2.1 실험 재료 ················································································· 28
4.2.2 실험 방법 ················································································· 29
4.3 실험결과 및 고찰 ·········································································· 30
4.3.1 Ar+2%N2 혼합가스를 이용한 STS 308 용접 실험························· 30
4.3.2 2% N2가 첨가된 실드가스를 이용한 Super Duplex STS 용접········· 31
4.4 결언 ···························································································· 33
제 5 장 플라즈마 스트림 모델의 타당성 검증 실험 ································· 34
5.1 서언 ····························································································· 34
5.2 실험 재료 및 방법 ········································································· 35
5.2.1 실험 재료 ················································································· 35
5.2.2 실험 방법 ················································································· 36
5.3 실험결과 및 고찰 ·········································································· 37
5.4 결언 ···························································································· 42
제 6 장 결론 ······················································································· 43
참고문헌 ······························································································ 44
감사의 글 ····························································································· 47
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슈퍼듀플렉스 STS의 GTAW에서 질소 침투에 관한 플라즈마 스트림 모델 개발.pdf
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