退火工艺的组成为把钢加热到一定温度并保持一段时间，通常再缓慢冷却。
The process of annealing consists of heating the steel to an elevated temperature for a definite period of time and, usually, cooling it slowly.
退变质过程以黄铁矿变斑晶生长、矿石糜棱岩的形成、二次退火和化学再活化为特征。
Retrograde metamorphism at Hongtoushan is characterized by porphyroblastic growth of pyrite, formation of ore mylonite, secondary annealing and chemical remobilization.
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