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表皮0.20mm有"非M"產生. 要"全M"硬度才會HRC 60.
錯誤的加熱溫度, 產生殘留沃斯田鉄. 基地應保留碳化物微粒, 刀具刀刃才不易鈍 (good edge retention).
氧化鉄 (Fe3O4) 中的氧在高溫下會與鋼材表皮的碳結合, 造成表面脫碳.
Annealed state: carbide particles dispersed in the matrix of Ferrite. To have a good edge retention, at least 1/5 of these particles should be retained in the matrix during Austenization and right before quenching.
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