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亚共析钢在亚温区冷却时α-相的析出过程通常看作如同平衡状态一样。这时形成的α-相数量,可根据Fe-Fe_3C平衡图用杠杆定律来估算。计算的正确性只有钢足够缓慢地冷却时才不致引起疑问。 亚共析钢在实际热处理条件下(如在完全退火或均匀化退火、正火以及借助轧制加热或特殊加热的热强化时),在亚温区其冷却是被加快的。无论何时所形成的α-相数量
Sub-eutectoid steel cooling in the sub-temperature α-phase precipitation process is usually regarded as the same as the equilibrium state. The amount of α-phase formed at this time can be estimated by the law of leverage according to the Fe-Fe_3C equilibrium diagram. The correctness of the calculation does not cause any doubt when the steel is cooled slowly enough. The sub-eutectoid steels are accelerated in the sub-temperate zone under actual heat treatment conditions, such as complete annealing or homogenization annealing, normalizing, and heat strengthening by means of rolling or special heating. No matter when the formation of α-phase number