Abstract
Authors reported already that, when joining Fe to alloying elements commonly found in steel, such as C, Cr, Co, Ni and W, with Cu filler metal, a "dissolution and deposit of base metal" took place. In this paper, the configuration of the dissolution and deposit in Cu brazing to dissimilar alloy steels containing those alloying elements was investigated metallographically. The shear strength of the brazed joints was also examined.In joining low and high C steels to high speed tool steel and stainless steel, C of alloying elements exerts the greatest influence on the dissolution and deposit-that is, the lower C base metal when compared to the other one dissolves into molten Cu filler metal and, simultaneously, the columnar Fe alloy phase deposits from the higher C base metal under a constant brazing temperature.The shear strength of the joints, with the exception of stainless steel-high C steel joint in which a chromium carbide forms at the high C steel boundary, remarkably advances by linking both base meatls with this columnar deposited phase.
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