Toru Nagaoka, Kiyoshi Mizuuchi, Masami Sugioka and Masao Fukusumi
Department of Processing Technology, Osaka Municipal Technical Research Institute, Osaka 536-8553
Joints composed of stainless steel and Ti were fabricated from Cr-plated SUS304L alloy rods and Ti rods using vanadium foil as an insert metal, in a process using pulsed current hot pressing (PCHP) equipment. The effects of the bonding temperature and the thickness of the Cr-plate layer on the mechanical properties of the joints were investigated. Tensile testing at 300 K and microstructural observations were carried out.
The joints fabricated at 1173 K from 20 μm thick Cr-plated SUS304L rods and Ti rods showed the highest tensile strength of 340 MPa. SEM-EDS analyses revealed that the Cr-plate layer was left after PCHP process and no intermetallic compounds formed at the bonding interfaces. The cracks originally existed in the Cr layer plated on SUS304L rods disappeared perfectly during PCHP process at 1273 K.
In contrast, the joints fabricated from 5 μm thick Cr-plated SUS304L rods and Ti rods showed the lowest tensile strength because of the formation of FeV intermetallic compound in the bonded interlayer.
diffusion bonding, SUS304L stainless steel, titanium, chromium plating, intermetallic compound, pulsed current hot pressing
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