Abstract
The effect of the Fe foil insert on the Charpy U-notch impact value for stainless steel (JIS SUS304)/high-carbon steel (1.04%C) joint brazed with Cu filler metal(JIS BCu-1) was investigated in a temperature range from 193 to 973 K. Furthermore, the SUS304/high-carbon steel joint with the Fe foil insert was compared to the other joints brazed with Au filler metal (BAu-2), Ni filler metal (BNi-2) and Ag filler metal (BAg-8).When inserting the 0.3 mm thick Fe foil between the base metals prior to the Cu brazing in order to prevent the formation of Cr23C6 and Cr7C3 carbides at the high-carbon steel braze interface due to the dissoluion of SUS304, the dissolution and deposit of base metal takes place on either side of the foil: On the high-carbon steel side, the high-carbon steel and the Fe foil are united with the columnar Fe-9∼7%Cu-0.8%C alloy which comes from the high-carbon steel, and on the SUS304 side, the SUS304 and the Fe foil are also united with the columnar Fe-13∼12%Cr-9∼6%Cu-5∼4%Ni-0.2%C alloy coming from the Fe foil. As a result, both SUS304 and high-carbon steel base metals are united with each columnar phase through the foil, so that the impact value of the joints increased markedly from 1.3 to 11.2 J/cm2 at room temperature.Moreover, this uniting with each columnar phase exhibited a remarkable effect on the impact value of the joint in the range between room temperature and 973 K compared to the other joints brazed with BAu-2, BNi-2 and BAg-8. Also, it was possible to braze the SUS304 to the graphite, instead of high-carbon steel, with BCu-1 by inserting the Fe foil.
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