Abstract
Abstract The aim of the present study is to derive optimized post heat treatment temperatures to get a proper formability for Ti/STS409L/Ti clad materials. These clad materials were fabricated by cold rolling followed by a post heat treatment process for 10 minutes at temperatures ranging from 500℃ to 850℃. The microstructure of the interface was observed using a Scanning Electron Microscope(SEM) and an Energy Dispersive X-ray Analyser(EDX) in order to investigate the effects of post heat treatment on the bonding properties of the Ti/STS409L/Ti clad materials. Diffusion bonding was observed at the interfaces with a diffusion layer thickness increasing with the post heat treatment temperature. The diffusion layer was composed of a type of(e + ζ) intermetallic compound containing additional elements, namely, Fe, Ti and Ni. The micro Knoop hardness of the Ti/STS409L interfaces was found to increase with heat treatment up to 800℃ and then decrease for temperatures rising up to 850℃. The tensile strength was shown to decrease for heat treatment temperature increasing to 750℃ and then increase rapidly for temperature rising up to 850℃. A post heat treatment temperature range of 700~750℃ was found to optimize the formability of Ti/STS409L/Ti clad materials.
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