The effect of thermomechanical treatment on the interface microstructure and local mechanical properties of roll bonded pure Ti/439 stainless steel multilayered materials
✍ Scribed by K.S. Lee; D.H. Yoon; S.E. Lee; Y.S. Lee
- Publisher
- Elsevier
- Year
- 2011
- Tongue
- English
- Weight
- 654 KB
- Volume
- 10
- Category
- Article
- ISSN
- 1877-7058
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✦ Synopsis
In this study, commercial pure titanium was hot roll bonded with ferritic stainless steel (STS), and subsequently secondary roll bonding process was carried out to fabricate four-ply stainless steel-aluminum-stainless steel-pure titanium multilayered metallic sheet. Interface microstructure between titanium and STS was investigated using a scanning electron microscope (SEM) and transmission electron microscope (TEM) in order to verify subtle change of diffusion bonded layer, resulting in limited formation of the brittle intermetallic compounds within diffusive bonding layer. The local mechanical properties of the Ti/STS interface depending upon different thermomechanical treatment processes have been investigated by nanoindentation tests. A strong dependence between secondary roll bonding process condition and a kind of diffusion hardening was detected by increasing interface hardness. The influence of the considerable increase in hardness up to about 8.09 0.11 GPa at diffusion layer compared with Ti and STS base materials upon the mechanical properties of the overall multilayered metallic sheet is also discussed.