피스톤 크라운용 단강에 인코넬 718 용접재료로 용접된 용접부의 특성 평가
Evaluation of Characteristics of Welding Zones Welded with Inconel 718 Filler Metal to Piston Crown Forged Material
0
조회
0
다운로드
0
인용
0
참고문헌
키워드
초록
The combustion chamber of a diesel engine is often exposed to a more serious wear and corrosion environment than other parts of the engine because its temperature increases as a result of using heavy oil of low quality. Therefore, repair and built-up welding methods must be performed on worn or corroded parts of the piston crown, exhaust valve, etc. from an economical point of view. In this study, Inconel 718 filler metal was used in repair welding on the groove of a forged steel specimen for a piston crown, along with built-up welding on the surface of another forged steel specimen. Then, the corrosion characteristics of the weld metal zone for the repair welding and the deposited metal zone for the built-up welding were investigated using electrochemical methods in a 35% H2SO4 solution. The deposited metal zone indicated better corrosion resistance than the weld metal zone, showing a nobler corrosion potential, higher impedance, and smaller corrosion current density. It is considered that metal elements with good corrosion resistance were generally included in the filler metal, and these elements were also greatly involved in the deposited meta by built-up welding, whereas the weld metal consisted of metal elements mixed with both the filler metal and base metal elements because of the molten pool produced by the repair welding. Finally, it is considered that the hardness of the weld metal was increased by the repair welding, whereas the built-up welding improved the corrosion resistance of the deposited metal.
Abstract
The combustion chamber of a diesel engine is often exposed to a more serious wear and corrosion environment than other parts of the engine because its temperature increases as a result of using heavy oil of low quality. Therefore, repair and built-up welding methods must be performed on worn or corroded parts of the piston crown, exhaust valve, etc. from an economical point of view. In this study, Inconel 718 filler metal was used in repair welding on the groove of a forged steel specimen for a piston crown, along with built-up welding on the surface of another forged steel specimen. Then, the corrosion characteristics of the weld metal zone for the repair welding and the deposited metal zone for the built-up welding were investigated using electrochemical methods in a 35% H2SO4 solution. The deposited metal zone indicated better corrosion resistance than the weld metal zone, showing a nobler corrosion potential, higher impedance, and smaller corrosion current density. It is considered that metal elements with good corrosion resistance were generally included in the filler metal, and these elements were also greatly involved in the deposited meta by built-up welding, whereas the weld metal consisted of metal elements mixed with both the filler metal and base metal elements because of the molten pool produced by the repair welding. Finally, it is considered that the hardness of the weld metal was increased by the repair welding, whereas the built-up welding improved the corrosion resistance of the deposited metal.
참고문헌 (18)
- 안석환, "용접열사이클 재현에 의한 SS400강 및 STS304강의 특성 평가- 제1보: 기계적 특성 및 조직", 한국해양공학회지, 19(6), pp.64~71 (2005), 한국해양공학회
- American Society of Mechanical Engineers (ASME), "Specification for Nickel and Nickel-Alloy Bare Welding Electrodes for Shielded Metal Arc Welding. ASME Boiler & Pressure Vessel Code, SFA-5.11, Identical with AWS specification A5.11", A5. 11M-97, 2001
- American Society of Mechanical Engineers (ASME), "Specification for Nickel and Nickel Alloy Bare Welding Electrodes and Rods. ASME Boiler & Pressure Vessel Code, SFA-5.14, Identical with AWS specification A5.14", A5. 14M-97, 2001
- Bilmes, P.D, "Microstructure and Pitting Corrosion of 13CrNiMo Weld Metal", Corrosion Science, 48(10), pp.3261~3270 (2006)
- Garcia, C. I, "Superalloys 718, 625 and Various Derivatives", pp.925~941 (1991), TMS
- Jeon, D.H, "Control of the Corrosion and Anti-corrosion", pp.426~428 (1985), Iljoongsha
- Jones, D.A, "Principles and Prevention of Corrosion", pp.314~ (1998), Prentice-Hall
- 김진경, "선박용 디젤기관의 주철부품 보수용접 특성에 관한 연구", 한국해양공학회지, 20(2), pp.41~45 (2006), 한국해양공학회
- Kim, M. N, "A Study of Mechanical Properties of Underwater Wet Welding Electrode", Journal of Ocean Engineering and Technology, 14(4), pp.56~61 (2000)
- Kim, J. G, "Metal Material of Ship and Its Control Management", pp.446~ (2013), Dasom Publishing Co
- Moon, K.M, "Practical Electro-chemistry", pp.177~ (1999), Hyosung Publishing Co
- 문경만, "A Study on the Post-Weld Heat Treatment Effect to Mechanical Properties and Hydrogen Embrittlement for Heating Affected Zone of a RE 36 Steel", CORROSION SCIENCE AND TECHNOLOGY, 32(6), pp.6~288 (2003), 한국부식방식학회
- 문경만, "용접재료 별 주강 피스톤 크라운 용접부위의 부식 특성에 대한 평가", 한국해양공학회지, 28(4), pp.356~362 (2014), 한국해양공학회
- Muylder, J. V, "Rergomon Press and Cebelcor", pp.260~509 (1966), McGraw-Hill Book Publishing Co
- Muzyka, D.R, "The Superalloys", pp.113~143 (1972), John Wiley & Sons
- Shin, M.K, "New Edition Workshop Practice", pp.244~245 (1984), Ah Sung Publishing Co
- Tsay, L.W, "Hydrogen Sulphide Stress Corrosion Cracking of 2.25 Cr-Mo Steel Weldments", Corrosion Science, 39(7), pp.1165~1176 (1997)
- Vander Voort, G.F, "ASM Handbook 9 Metallography and Microstructures", pp.305~345 (1985), ASM International