To reheat hardened steel or hardened cast iron to some temperature below the eutectoidtemperature 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。
2
The massive microstructure after annealing above the eutectoidtemperature changed greatly. The microstructure became more uniform and more fine and the defects within it nearly disappeared.