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자료유형
학술저널
저자정보
Juhwa Lee (Sungkyunkwan University) Jeongho Hwang (Sungkyunkwan University) Dongho Bae (Sungkyunkwan University)
저널정보
대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.24 No.4
발행연도
2018.1
수록면
877 - 885 (9page)

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In this paper, welding residual stress analysis and fatigue strength assessment were performed at elevated temperature formulti-pass dissimilar material weld between Alloy 617 and P92 steel, which are used in thermal power plant. Multi-passwelding between Alloy 617 and P92 steel was performed under optimized welding condition determined from repeated pretestwelding. In particular, for improving dissimilar material weld-ability, the buttering welding technique was applied onthe P92 steel side before multi-pass welding. Welding residual stress distribution at the dissimilar material weld joint wasnumerically analyzed by using the fi nite element method, and compared with experimental results which were obtained bythe hole-drilling method. Additionally, fatigue strength of dissimilar material weld joint was assessed at the room temperature(R.T), 300, 500, and 700 °C. In fi nite element analysis results, numerical peak values; longitudinal (410 MPa), transverse(345 MPa) were higher than those of experiments; longitudinal (298 MPa), transverse (245 MPa). There are quantitativelybig Differences between numerical and experimental results, due to some assumption about the thermal conductivity, specifi cheat, Effects of enforced convection of the molten pool, dilution, and volume change during phase transformation caused byactual shield gas. The low fatigue limit at R.T, 300 °C, 500 °C and 700 °C was assessed to be 368, 276, 173 and 137 MParespectively.

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