Korean Journal of Metals and Materials (대한금속재료학회지)

The Korean Institute of Metals and Materials (대한금속재료학회)
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Effect of Post Heat Treatment Temperature on Interface Diffusion Layer and Bonding Force in Roll Cladded Ti/Mild steel/Ti Material

압연 클래드된 Ti/Mild steel/Ti 재의 계면확산층과 접합력에 미치는 후열처리온도의 영향

  • Lee, Sangmok (Advanced Forming Tech. Center, Korea Institute of Industrial Technology) ;
  • Kim, Su-Min (Dept. of Materials Science & Engineering, Dong-Eui University) ;
  • We, Se-Na (Dept. of Materials Science & Engineering, Dong-Eui University) ;
  • Bae, Dong-Hyun (Korea Clad Tech Co., Ltd.) ;
  • Lee, Geun-An (Advanced Forming Tech. Center, Korea Institute of Industrial Technology) ;
  • Lee, Jong-Sup (Advanced Forming Tech. Center, Korea Institute of Industrial Technology) ;
  • Kim, Yong-Bae (Advanced Forming Tech. Center, Korea Institute of Industrial Technology) ;
  • Bae, Dong-Su (Dept. of Materials Science & Engineering, Dong-Eui University)
  • 이상목 (한국생산기술연구원 정밀성형기술센터) ;
  • 김수민 (동의대학교 신소재공학과) ;
  • 위세나 (동의대학교 신소재공학과) ;
  • 배동현 ((주)한국클래드텍) ;
  • 이근안 (한국생산기술연구원 정밀성형기술센터) ;
  • 이종섭 (한국생산기술연구원 정밀성형기술센터) ;
  • 김용배 (한국생산기술연구원 정밀성형기술센터) ;
  • 배동수 (동의대학교 신소재공학과)
  • Received : 2012.02.01
  • Published : 2012.05.25
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Abstract

The aim of this study is to investigate the effect of post heat treatment on bonding properties of roll cladded Ti/MS/Ti materials. First grade Ti sheets and SPCC mild steel sheets were prepared and then Ti/MS/Ti clad materials were fabricated by a cold rolling and post heat treatment process. Microstructure and point analysis of the Ti/MS interfaces were performed using the SEM and EDX Analyser. Diffusion bonding was observed at the interfaces of Ti/MS. The thickness of the diffusion layer increased with post heat treatment temperature and the diffusion layer was verified as having $({\epsilon}+{\zeta})+({\zeta}+{\beta}-Ti)$ intermetallic compounds at $700^{\circ}C$ and an $({\zeta}+{\beta}-Ti)$ intermetallic compound at $800^{\circ}C$, respectively. The micro Knoop hardness of mild steel decreased with post heat treatment temperature; however, those of Ti decreased at a range of $500{\sim}600^{\circ}C$ and showed a uniform value until $800^{\circ}C$ and then increased rapidly up to $900^{\circ}C$. The micro Knoop hardness value of the diffusion layer increased up to $700^{\circ}C$ and then saturated with post heat treatment. A T-type peel test was used to estimate the bonding forces of Ti/Mild steel interfaces. The bonding forces decreased up to $800^{\circ}C$ and then increased slightly with post heat treatment. The optimized temperature ranges for post heat treatment were $500{\sim}600^{\circ}C$ to obtain the proper formability for an additional plastic deformation process.

Keywords

Acknowledgement

Supported by : 지식경제부

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