피스톤 크라운용 단강에 인코넬 718 용접재료로 용접된 용접부의 특성 평가

다국어 초록 (Multilingual 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.

목차 (Table of Contents)

• ABSTRACT
• 1. 서론
• 2. 재료 및 실험 방법
• 3. 실험 결과 및 고찰
• 4. 결론
• References

참고문헌 (Reference)

1 문경만, "용접재료 별 주강 피스톤 크라운 용접부위의 부식 특성에 대한 평가" 한국해양공학회 28 (28): 356-362, 2014

2 안석환, "용접열사이클 재현에 의한 SS400강 및 STS304강의 특성 평가- 제1보: 기계적 특성 및 조직" 한국해양공학회 19 (19): 64-71, 2005

3 김진경, "선박용 디젤기관의 주철부품 보수용접 특성에 관한 연구" 한국해양공학회 20 (20): 41-45, 2006

4 Muzyka, D.R, "The Superalloys" John Wiley & Sons 113-143, 1972

5 Garcia, C. I, "Superalloys 718, 625 and Various Derivatives" TMS 925-941, 1991

6 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"

7 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"

8 Muylder, J. V, "Rergomon Press and Cebelcor" McGraw-Hill Book Publishing Co 260-509, 1966

9 Jones, D.A, "Principles and Prevention of Corrosion" Prentice-Hall 314-, 1998

10 Moon, K.M, "Practical Electro-chemistry" Hyosung Publishing Co 177-, 1999

11 Shin, M.K, "New Edition Workshop Practice" Ah Sung Publishing Co 244-245, 1984

12 Bilmes, P.D, "Microstructure and Pitting Corrosion of 13CrNiMo Weld Metal" 48 (48): 3261-3270, 2006

13 Kim, J. G, "Metal Material of Ship and Its Control Management" Dasom Publishing Co 446-, 2013

14 Tsay, L.W, "Hydrogen Sulphide Stress Corrosion Cracking of 2.25 Cr-Mo Steel Weldments" 39 (39): 1165-1176, 1997

15 Jeon, D.H, "Control of the Corrosion and Anti-corrosion" Iljoongsha 426-428, 1985

16 Vander Voort, G.F, "ASM Handbook 9 Metallography and Microstructures" ASM International 305-345, 1985

17 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" 한국부식방식학회 32 (32): 6-288, 2003

18 Kim, M. N, "A Study of Mechanical Properties of Underwater Wet Welding Electrode" 14 (14): 56-61, 2000