Study on Controlling of Intermetallic Phases at the Bond Interface of Ti/Steel Composites

商用纯钛可将各种碳含量的铁和钢结合在一起;含0.01%（ULC）的低碳钢，含0.19%c（S20 C）的轻钢，含3.7k%c（FCD）的轻钢。在900 ° C以下连接的张力强度被碳含量勉强渗透，并在绑定温度下增加上升。在900 ° C以上， However，Ti-to-ULC联合显示出恒定值的强度，即Ti-to-S20 C联合分解，以及Ti-to-FCD在绑定温度下上升的情况下增加。在Ti-to-FCD连接中仅与Ti-to-FCD连接中的TiFe和TiFe_2形成的界面。由于Ti和Fe在Ti-to-ULC上的差异超过了Ti-to-FCD的差异，TiC层可能会考虑到与Ti和Fe的扩散的干扰，并且可能会抑制TiFe和TiFe_2的形成，其显著性比TiC更严重。Ti-to S20 C的层与TiFe和tife_2相结合的Ti-to S20 C。在中间层中共存的碳化物和金属化合物似乎在减少联合强度，使其比那些形式的个人更广泛。

A commercially pure titanium has been diffusionbonded to iron and steels of various carbon contents;low carbon steel with 0.01%(ULC), mild steel with 0.19%c(S20C) and spheroidal graphite case iron with 3.7k%c(FCD). The tensile strength of joints bonded below 900゜C was hardly influenced by the carbon content, and increased with the rise in bonding temperature. above 900゜C, however, the strength of the Ti-to-ULC joint showed a constant value, that of the Ti-to-S20C joint decreased, and that of the Ti-to-FCD increased with the rise in bonding temperature. The interlayer forming along the bond interface consisted only of TiC in the Ti-to-FCD joint and of TiFe and TiFe_2 in the Ti-to-ULC. Since Ti and Fe diffused over much longer distances in the Ti-to-ULC than in the Ti-to-FCD, the TiC layer may be considered to interfere with the diffusion of Ti and Fe, and consequently to suppress the formation of TiFe and TiFe_2 which decrease the joint strenght more seriously than TiC. The interlayer in the Ti-to S20C consisted of TiC as well as TiFe and tife_2. The coexisting carbide and intermetallic compounds in the interlayer, seems to reduce the joint strength to a more extent than those formed individually.