To reheat hardened steel or hardened cast iron to some temperature below the eutectoid temperature for the purpose of decreasing hardness and increasing toughness.
重新加热硬化钢或硬化铸铁至某一温度，低于共析温度下，使硬度降低，韧度增加。
The massive microstructure after annealing above the eutectoid temperature changed greatly. The microstructure became more uniform and more fine and the defects within it nearly disappeared.
块状组织在高于共析温度退火时，组织形态变化较大，组织变得细密均匀，且缺陷已趋于消失。
The massive microstructure after annealing above the eutectoid temperature changed greatly. The microstructure became more uniform and more fine and the defects within it nearly disappeared.
块状组织在高于共析温度退火时，组织形态变化较大，组织变得细密均匀，且缺陷已趋于消失。
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