Fig. 11
From: Microstructure and long-term corrosion of archaeological iron alloy artefacts
Illustration of mapping of ghost structures (graphitised and intact cementite in DPL) and structures revealed after nital etching (when possible) in a object #1, b object #2, c object #3 and d object #4. In blue: metallic part. a region with circles corresponds to lamellar pearlite in hypoeutectoid steel (C < 0,1%); region without circle has not reveal pearlitic structure. b region with squares corresponds to lamellar pearlite in hypereutectoid steel (C ≈ 1%); region with circles correspond to lamellar pearlite in close to eutectoid steel (C ≈ 0.78%); region without circle or square has not reveal pearlitic structure. c Region with circles corresponds to lamellar pearlite in hypoeutectoid steel (C ≈ 0.6%); region with squares corresponds to acicular overheat pearlite in hypoeutectoid steel (C ≈ 0.3–0.6%); region with stars corresponds to acicular overheat pearlite in hypoeutectoid steel (C ≈ 0.4%); region without circle, square or star has not reveal pearlitic structure. d region with circles corresponds to lamellar pearlite in hypoeutectoid steel (max. 0.2% C); region without circle has not reveal pearlitic structure; hatched region unreadable