Analysis of Homogenizing Process of Alloying Elements on Transient Liquid Insert Metal Diffusion Bonding

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This study evaluated homogenizing process of alloying elements such as aluminum, titanium and chromium during Transient Liquid Insert Metal Diffusion Bonding (TLIM-bonding) of Ni-base superalloys such as MM007, Mar-M247, Inconel 713C and IN939 with a Ni-15%Cr-4% B amorphous insert metal. The detailed analysis at the bonded interlayer of TLIM-bonded joint was performed quantitatively using electron probe microscopy (EPMA) technique. From the experimetal results, concentrations at the center of the bonded interlayer (Ct) of aluminum and titanium increased and that of chromium decreased dependently on a holding time during homogenizing process due to elements diffusion from the base metal to the bonded interlayer. Further, increasing temperature decreased holding time for completion of the homogenizing process. Homogenizing process was calculated analytically by applying the one-dimensional diffusion model considering the base metal dissolution, thereby equaitions were derived for estimating the concentration, Ct of aluminum, titanium and chromium, i.e., Al, Ti : C_t=C_O[1- erf {h/2(Dt)^<1/2>}]+C_i, Cr: C_t=C_q erf {h/2(Dt)^<1/2>}+C_b where 2h is a width of the bonded interlayer, C_i is an initial concentration of an element in the bonded interlayer, C_b is a concentration of an element in the base metal. C_O is the term (C_b-C_i), C_q is the term (C_i-C_b) and D is a diffusion coefficient of an element. The calculated values corresponded well with experimental ones, except in the early, stage of the homogenizing process. It follows that the above equations can estimate the holding time of completion of the homogenizing process in fabrication.
社団法人溶接学会の論文
1992-10-01

Analysis of Homogenizing Process of Alloying Elements on Transient Liquid Insert Metal Diffusion Bonding

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