由于马氏体这一淬硬钢主要成分的不稳定性，使得回火成为可能。
Tempering is possible because of the instability of the martensite, the principal constituent of hardened steel.
回火完全淬硬钢得到的最终组织结构被称为回火马氏体。
The final structure obtained from tempering a fully hardened steel is called tempered martensite.
研究了回火工艺对无限冷硬轧辊表层基体组织的影响。
Effects of different tempering processes on surface microstructure of indefinite chill cast-iron roller were studied.
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