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Microstructural analysis of a grey cast iron self-ventilating brake disc

Micro-structural analysis of a grey cast iron self-ventilating brake disc.

The images show the presence of lamellar graphite (black colored, in the low magnification image) and a perlitic micro-structure (in the high magnification image with Nital 2% chemical etchant).

Brake disc graphite slats - 100X

100X magnification – lamellar graphite (black colored)
Perlitic microstructure of a brake disc - 1000X

1000X magnification – Nital 2% chemical etchant – perlitic micro-structure