Identification of predominant interfacial contact mechanisms in solid-state bonding of superplastic high carbon steel

Abstract

Interfacial contact mechanisms and the superplastic behaviour of fine-grained high carbon steel during solid-state bonding were investigated. According to the results, typical superplastic deformation occurred at the bonding interface under conditions of superplasticity- causing temperature (T =1003∼1053K), bonding pressure (P = 34∼44.3MPa), and bonding area ratio (S = 30∼50%). The stress exponent, n, was about 2.25 while the activation energy, Q, was about 189 kJmol-1 both indicating and confirming superplastic solid-state bonding. Predominant bonding mechanism controlled by superplastic deformation was experimentally identified.