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。

To reheat hardened steel or hardened cast iron to some temperature below the eutectoid temperature for the purpose of decreasing hardness and increasing toughness.

youdao

这类材料由具有加热软化、冷却硬化甚至可重复循环能力的聚合物组成。

This class of materials consists of polymers which always remain capable of being softened by heat and of hardening on cooling, even after repeated cycling.

youdao

热塑塑料可通过加热和加压成形和再成形，而热固塑料却由于在硬化过程中发生了化学变化而不能再成形。

Thermoplastics can be shaped and reshaped by heat and pressure but thermosets cannot be reshaped because they undergo chemical changes as they harden.

youdao