Vacuum Hot-Roll Bonding of Titanium and Carbon Steel Using Pure Iron Interlayer

In this paper, the effect of a pure iron interlayer on the properties of the multi-pass hot-roll bonding titanium/carbon steel plate was studied. The mechanical and microstructural properties of the composite plate were investigated by optical microscopy and scanning electron microscopy, as well as tensile-shear, bending, and tensile tests. The results show that when the reduction ratio is below 18%, the shear strength of the interface is higher with the pure iron interlayer than without it. At 35% reduction, the shear strength is similar in both cases. At a reduction ratio of 68%, with the pure iron interlayer, fracture of the bonding interface occurs on the titanium matrix, whereas without the pure iron interlayer, fracture occurs on both the titanium matrix and the compound layer on the interface; the pure iron interlayer improves the bending and tensile properties of the titanium/carbon steel plate appreciably.