Korean Journal of Metals and Materials (대한금속재료학회지)

The Korean Institute of Metals and Materials (대한금속재료학회)
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Effect of Pre-Heat Treatment on Bonding Properties in Ti/Al/STS Clad Materials

Ti/Al/STS 클래드재의 접합특성에 미치는 예비 열처리의 영향

  • Bae, Dong-Hyun (Korea Clad Tech Co., Ltd.) ;
  • Jung, Su-Jung (Dept. of Advanced Materials Engineering, Dong-Eui University) ;
  • Cho, Young-Rae (Division of Materials Science and Engineering, Pusan National University) ;
  • Jung, Won-Sup (Division of Materials Science and Engineering, Pusan National University) ;
  • Jung, Ho-Shin (Division of Advanced Materials Engineering, Pukyong National University) ;
  • Kang, Chang-Yong (Division of Advanced Materials Engineering, Pukyong National University) ;
  • Bae, Dong-Su (Dept. of Advanced Materials Engineering, Dong-Eui University)
  • Received : 2009.01.30
  • Published : 2009.09.25
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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 $400^{\circ}C$, 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 $Fe_3Al$, $Al_3Fe$ 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.

Keywords

Acknowledgement

Supported by : 동의대학교

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