Effect of first pass rolling reduction ratio on the microstructure and mechanical properties of TA1/Q235B clad plates

In this study, the microstructure, the shear strength and Vickers-hardness of TA1/Q235B clad plates under different first pass rolling reduction ratio (FP3R) were investigated. The microstructure and bonding interface were analyzed by optical microscopy (OM), scanning electron microscopy (SEM). The Vickers-hardness and tensile shear strength were also detected. The result indicated a good bonding along the interface of the bonded with flat and smooth under different reduction ratio. The shear strength of the TA1/Q235B clad plate increases with the increase of reduction ratio which was 189 MPa at maximum. The maximum Vickers-hardness was approximately 198.7 HV. The thickness of Ti and Fe diffusion layer increases from 2.6 to 3.65 [Formula: see text]m and 2.1 to 3.3 [Formula: see text]m, respectively. TiC and Fe-Ti intermetallic compounds were formed at the bonding interface due to diffusion of Fe, Ti and C, causing micro-indentation at the interface to initiate cracking and diffusion, and reduced the bonding quality.