Martensitic white iron - Nihard. Typical analysis 3% carbon - 1% silicon - 3.8% nickel - 2% chromium. Micrograph main constituents are austenite (grey) containing coarse needles of martensite (dark) together with carbides (white) in degenerate eutectic association with smaller regions of austenite and martensite. Light micrograph in bright field. Magnification 500x.
© Brian & Mavis Bousfield / Science & Society