Abstract: In order to solve the problem that brittle compounds are easy to be formed at high temperature and difficult to combine at low temperature in the process of preparing TA1/304 composite plate by traditional hot rolling, a new method of vacuum billet and pulse current-assisted rolling is proposed. First of all, under the action of 750 ℃ and 300 A constant current, the effects of 24.4%, 41.6% and 54.4% rolling reduction on the composite plate were studied systematically. It was found that the shear strength of 41.6% reduction was the highest, reaching 356 MPa. On this basis, according to the rolling test of 41.6% reduction rate, the effect of current density on TA1/304 rolling composite was further analyzed, and the rolling tests with current density of 0.57 A/mm², 1.15 A/mm² and 1.72 A/mm² were carried out respectively. The experimental results under different current densities show that the element diffusion is not sufficient and the shear strength is 296 MPa during 0.57 A/mm². During 1.15 A/mm², the diffusion of interfacial elements increases significantly, the bonding strength increases, and a good metallurgical bonding effect is obtained. On the other hand, the higher current density of 1.72 A/mm² leads to the microvoids in Kirkendall caused by accelerated diffusion, which leads to the decrease of tensile shear strength, which is only 209 MPa. Therefore, the matching of appropriate current density and reduction rate is the key factor to greatly improve the interfacial bonding strength of TA1/304 stainless steel clad plate at lower temperature and lower reduction rate.

Key words: TA1/304 composite plate, pulsed current, shear strength, microstructure, element diffusion