異種炭素鋼銅ろう付における柱状Fe-Cu-C合金の晶出機構

概要

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Authors have already reported that in the Cu brazing to dissimilar C steels a "dissolution and deposit of base metal" took place -that is, the low C steel base metal dissolves into molten Cu filler metal and, simultaneously, the dissolved Fe deposits as the columnar Fe-Cu-C alloy phase from the high C steel boundary at a constant brazing temperature. In this paper, the deposit mechanism of the columnar Fe-Cu-C alloy was investigated and results obtained were as follows ;(1) The columnar Fe-Cu-C alloy consists of 9 to 12% Cu, 1 to 2% C and the rest Fe.(2) When C steel dissolves into molten Cu, the Fe and C atoms will form the massive Fe-C associated compound.(3) The deposit of the columnar Fe-Cu-C alloy will be caused by that the low C Fe-C associated compound, which is dissolved into molten Cu from the low C steel, combines with C at the high C steel boundary to convert into the high C Fe-C associated compound due to larger bonding force of Fe-C compared with that of Fe-Cu in liquid Cu and its concentration exceeds the equilibrium quantity.
社団法人溶接学会の論文
1984-11-05