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경년열화된 Co기 초내열합금인 FSX414의 미세조직 변화
송진헌(J. H. Song),김용환(Y. H. Kim),변재원(J. W. Byeon),권숙인(S. I. Kwun),전채홍(C. H. Cheon),박기성(K. S. Park),김승태(S. T. Kim) 대한기계학회 2001 대한기계학회 춘추학술대회 Vol.2001 No.8
Artificial aging was performed to simulate the microstructural degradation in cobalt base superalloy, FSX414, caused by long time exposure to high temperature. Microstructural changes such as Cr depletion in surface layer, carbide coarsening, and formation of oxide particles and voids with aging time were investigated by OM, SEM, EPMA, XRD analysis. The Cr depletion layer increased with aging time in the beginning and then saturated. The oxide particles and voids in Cr depletion layer were founded to increas with increasing aging time.
김용환(Y. H. Kim),송진헌(J. H. Song),권숙인(S. I. Kwon),전채홍(C. H. Jeon),박기성(K. S. Park),김승태(S. T. Kim) 대한기계학회 2001 대한기계학회 춘추학술대회 Vol.2001 No.8
High temperature brazing with nickel-based filler metal was carried out to study the high temperatuer brazing behavior of superalloys. Both additive metal(IN 738) and the filler metals(AMDRY DF-4B and AMS 4778) were provided in a from of mixed with gas atomized powders and organic binder. This brazing paste was inserted into the gap between the joining parts, and a pressure of 0.05 to IMPa was applied to joining parts. The brazing process was conducted in vacuum furnace under2×10??torr. The microstructure and porosity of the brazed area were characterised by SEM, EDX and image analyser. The Cr borides with a blocky morphology were presents in the matal braged with DF-4B filler metals. Ni-Ni₃B eutectic phase was observed in both filler metals. The area braged with DF 4B exhibited much higher porosity than the one with AMS 4778. the pressure of 0.1-0.4MPa was found to produce lower porosity.