pre-annealing
... 预先通知书 previous notice 预先退火 pre-annealing 预先无性接近法 method of preliminary vegetative approachment ...
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其经预先退火得到全部铁素体组织，然后等温淬火得到铁素体和贝氏体双相组织的基体。
The ferrite is obtained first through annealing, then biphase structure of ferrite and bainite is obtained through isothermal quenching.
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