【单选题】【消耗次数：1】
高速钢淬火后进行多次回火的主要目的是（）。
①
消除残余奥氏体,使碳化物入基体
②
消除残余奥氏体,使碳化物充分析出
③
使马氏体分解,提高其韧性
④
消除应力,减少工件变形
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