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김승태 ( S . T . Kim ) 한국열처리공학회 1998 熱處理工學會誌 Vol.11 No.1
Cladding of stainless steel on mild steel was prepared by diffusion bonding process. The bond strength increased with an increase of bonding temperature and time. It was also found that the bond strength increased as the surface roughness decreased. After the diffusion bonding of stainless steel-mild steel, the mild steel part near the bonded interface showed higher strength than the base steel due to the migration of chromium and nickel from stainless steel to mild steel. Carbon migration from mild steel gave effect on the formation of chromium carbides at grain boundaries of stainless steel. the fractograpohic features of the imperfectly bonded interface showed rather coarse dimples in the mild steel part and very fine dimples in the stainless steel part.
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.