| Title |
Effect of Post Heat Treatment Temperature on Interface Diffusion Layer and Bonding Force in Roll Cladded Ti/Mild steel/Ti Material |
| Authors |
이상목(Sang Mok Lee); 김수민(Su Min Kim); 위세나(Se Na We); 배동현(Dong Hyun Bae); 이근안(Geun An Lee); 이종섭(Jong Sup Lee); 김용배(Yong Bae Kim); 배동수(Dong Su Bae) |
| DOI |
https://doi.org/10.3365/KJMM.2012.50.4.316 |
| ISSN |
1738-8228(ISSN), 2288-8241(eISSN) |
| Keywords |
Ti/Mild steel/Ti clad material; post heat treatment; bonding interface property; intermetallic compound; diffusion Layer; bonding force |
| 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 (ε+ζ)+(ζ+β-Ti) intermetallic compounds at 700℃ and an (ζ+β-Ti) intermetallic compound at 800℃, respectively. The micro Knoop hardness of mild steel decreased with post heat treatment temperature; however, those of Ti decreased at a range of 500~600 ℃ and showed a uniform value until 800℃ and then increased rapidly up to 900℃. The micro Knoop hardness value of the diffusion layer increased up to 700℃ 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℃ and then increased slightly with post heat treatment. The optimized temperature ranges for post heat treatment were 500~600℃ to obtain the proper formability for an additional plastic deformation process. |