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Analytical study on the Fe/Ti interface in titanium‐clad steels
Author(s) -
Kurosawa Fumio
Publication year - 1988
Publication title -
surface and interface analysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.52
H-Index - 90
eISSN - 1096-9918
pISSN - 0142-2421
DOI - 10.1002/sia.740120306
Subject(s) - materials science , titanium , intermetallic , metallurgy , carbide , titanium carbide , titanium alloy , alloy
The precipitates on the Fe/Ti interface in a rolled titanium‐clad steel was investigated by the potentiostatic etching with non‐aqueous electrolyte (SPEED method) followed by SEM observation and chemical analysis using a computer‐aided X‐ray microanalyser (CMA). Titanium‐clad steel (CP‐Ti/0.01% C steel) was annealed between 700 and 1000 °C for 0.5–100 h in vacuum. The cross‐section of the annealed clad steel was etched by the SPEED method and the morphology and the chemistry of the precipitates were investigated in relation to the interface by using SEM and CMA. Film‐like titanium carbide, intermetallic compunds (Fe 2 Ti, FeTi) and β‐Ti containing Fe were observed on the Fe/Ti interface. The shear strength depends on the quantity of film‐like titanium carbide on Fe/Ti interface but intermetallic compunds and β‐Ti have slight influence. Thus it is considered that the embrittlement of the Fe/Ti interface was caused by (1) diffusion of carbon in steel towards the titanium layer, (2) precipitation of film‐like titanium carbide at the interface, and (3) fracture at the film.