Application
Material: Pure iron.
Treatment process: Annealing.
Etching method: 4% nitric acid alcohol solution + thermal oxidation.
Tissue description: Ferrite. After oxidation and coloring, ferrite grains with different orientations show different colors.
Material: low carbon steel.
Treatment process: quenching.
Etching method: 4% nitric acid alcohol solution.
Tissue description: Large flake-like upper bainite + lath martensite (yellow).
Material: low carbon steel.
Treatment process: quenching.
Etching method: 4% nitric acid alcohol solution.
Tissue description: Large flake-like upper bainite + lath martensite (yellow).
Material: H70. Processing
technology: annealing. Etching
method: etching with ferric chloride and hydrochloric acid aqueous solution.
Tissue description: single-phase α twin, with obviously uneven grain sizes. Grains with different orientations show different colors.
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