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Vol.47, No.9, 573 ~ 580, 2009
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| Title |
| Effect of Pre-Heat Treatment on Bonding Properties in Ti/Al/STS Clad Materials |
| 배동현 Dong Hyun Bae , 정수정 Su Jung Jung , 조영래 Young Rae Cho , 정원섭 Won Sup Jung , 정호신 Ho Shin Jung , 강창룡 Chang Yong Kang , 배동수 Dong Su Bae |
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| Abstract |
| Titanium/aluminum/stainless steel(Ti/Al/STS) clad materials have received much attention due to their high specific strength and corrosion-resisting properties. However, it is difficult to fabricate these materials, because titanium oxide is easily formed on the titanium surface during heat treatment. The aim of the present study is to derive optimized cladding conditions and thereupon obtain the stable quality of Ti/Al/STS clad materials. Ti sheets were prepared with and without pre-heat treatment and Ti/Al/STS clad materials were then fabricated by cold rolling and a post-heat treatment process. Microstructure of the Ti/ Al and STS/Al interfaces was observed using a Scanning Electron Microscope(SEM) and an Energy Dispersed X-ray Analyser(EDX) in order to investigate the effects of Ti pre-heat treatment on the bond properties of Ti/ Al/STS clad materials. Diffusion bonding was observed at both the Ti/Al and STS/Al interfaces. The bonding force of the clad material with non-heat treated Ti was higher than that with pre-heat treated Ti before the cladding process. The bonding force decreased rapidly beyond 400℃, because the formed Ti oxide inhibited the joining process between Ti and Al. Bonding forces of STS/Al were lower than those of Ti/Al, because brittle Fe3Al, Al3Fe intermetallic compounds were formed at the interface of STS/Al during the cladding process. In addition, delamination of the clad material with pre-heat treated Ti was observed at the Ti/Al interface after a cupping test. |
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| Key Words |
| Ti/Al/STS clad material, pre-heat treatment, bonding force, interface property, delamination |
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