Structural modification of TA2/Q355B composite interface and study of TiC stability mechanism

Abstract

Constructing different titanium/steel composite interface structures and stabilising the TiC layer at 950°C through structural modification, the coexistence of multiple brittle phases at the composite interface was reduced and discussed the formation mechanism. Through structure modulation, the organisation of the bonding interface near the Ti side transformed into α-Ti, and the bond strength significantly increased to 290 MPa. Break through the rolling temperature should be limited to below 850°C, and the rolling temperature increases to 950°C. The bonding interface is transformed from discontinuous TiC and aggregated Fe₂Ti particles to a uniform and continuous TiC layer at 850 and 900°C. Achieving a regulated TiC layer thickness of 180–190 nm inhibited Fe₂Ti and FeTi production.