鉄鋼のチタンとの拡散接合性に及ぼす炭素の影響

概要

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A commericially pure titanium has been diffusion-bonded to iron and steels of various carbon contents ; low carbon steel with 0.01%C(ULC), mild steel with 0.19%C(S20C) and spheroidal graphite cast iron with 3.75%C(FCD). The tensile strength of joints bonded below 900℃ was hardly influenced by the carbon content, and increased with the rise in bonding temperature. Above 900℃, 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 interdiffusion of Ti and Fe, and consequently to suppress the formation of TiFe and TiFe_2 which decrease the joint strength 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.
社団法人日本鉄鋼協会の論文
1987-09-01