Impact Characteristics of Diffusion Bonds of Ferritic Spheroidal Graphite Cast Iron

概要

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Impact characteristics of diffusion bonded joints of ferritic spheroidal graphite cast irons and cast iron to mild steel have been investigated using an instrumented Charpy impact test machine. The tests were performed at 0℃ after ferritizing the joints. Main results obtained are as follows : (1) Absorbed energy of the cast iron joints banded without an insert metal was about 5 J, which was much lower than that of the base metal. (2) Absorbed energy of the cast iron joints bonded with Ni foil as an insert metal was higher than that of the joint without Ni foil. The absorbed energy increased with an increase in the thickness of Ni foil and the absorbed energy reached the base metal level when a 50-μm thick Ni foil was used an insert metal. (3) Bond toughness of the cast iron to the mild steel joint bonded without the insert metal increased with an increase in the bonding temperature. When the bonding temperature was higher than 900℃, the absorbed energy was higher than that specified by Japanese Industrial Standard, which is 12.7 J. (4) Bond toughness of the cast iron to the mild steel joints bonded with Ni foil of 10 or 20 μm in thickness at 820℃ was almost the same as that of the cast iron base metal.
社団法人溶接学会の論文
1990-04-01