Transient Liquid Phase Bonding of Carbon Steels

M. COLOSCHI, F. AUDEBERT, M. FONTANA, P. SVEC AND D.JANICKOVIC

Buenos Aires, Argentina

Conferencia; XV International Symposium on Metastable and Nano Materials” (ISMANAM 2008); 2008

Transient Liquid Phase Bonding (TLPB) of metallic materials is an isothermal bonding method which is capable of producing joints that have strength and other properties similar to the bonded material. The process uses an interlayer alloy which temporarily melts and then re-solidifies at the bonding temperature as the melting point depressant in the liquid interlayer diffuses into the material to be bonded. In this work two kinds of carbon steels were bonded, SAE 1010 (0,1 wt% C) and SAE 1040 (0.4 wt% C), employing a melt-spun amorphous Fe-B alloy with eutectic composition as “filling material”. It was analysed how the bonding temperature and holding time affect the process for bonding cylindrical pieces at a fitting pressure. Microstructure at the bonding zone was analysed by optical metallography and Vickers microhardness measures were done. The steel with 0.4 wt% C required shorter time to be bonded without remaining traces of the filling material. The effects of Boron and cooling condition on the microstructure and microhardness values are discussed.