During the tempering process, the austenite in bainite decomposed into ferrite and cementite by diffusion transformation.
在回火过程中，贝氏体中的奥氏体以扩散转变方式分解为铁素体和渗碳体。
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Diffusion transformation is finished within two hours.
两小时以内完成扩散型相变。
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