Microstructures of galvannealing coats plated on an iron substrate deformed by indentation.
Two different galvannealed (GA) steels with different formability performances were deformed at room temperature with a micro-Vickers indenter. Cross-sectional specimens for transmission electron microscopy were prepared from the indented areas using a focused ion beam technique. Direct evidence of plastic deformation of the GA coats was obtained. Cracks were observed to nucleate at triple points of two neighbouring Gamma and substrate Fe. The GA coat with better formability has finer grains than the GA coat, with worse formability.
Kobayashi
Koji
K
Department of Quantum Engineering, Nagoya University, Nagoya 464-8603, Japan.
Saka
Hiroyasu
H
D019544:Equipment Failure Analysis; D007501:Iron; D046529:Microscopy, Electron, Transmission; D013232:Steel
D013232:Steel; D007501:Iron