Abstract
In this study, the influence of brazing process conditions on the Ni brazed joint (Ni-Cr-B) strength of stainless steel (SUS304) was investigated by creep rupture test. The effects of the brazing clearance were discussed based on the experimental analysis using EPMA and SEM. The results obtained are as follows ;
(1) The effect of brazing clearance on the creep rupture strength is not observed though it had the biggest effect on the static tensile test.
(2) When the brazing clearance exceeds 20 μm, the brazing layer is separated into two layers. The central line zone of the brazing layer 2 (embrittlement layer) has the composition close to the original brazing alloy, and the other layer is solid solution of Ni-Cr (brazing layer 1). The embrittlement layer gradually disappears through diffusion into the neighboring brazing layer 1 area over a long period of high temperature (1073 K) creep testing.
