Fe_3C was transformed into Fe_3 ( C, B) during a rather long-term tempering. The kinetic curve of Fe_3 ( C, B) is the ε shape,, its nose temperatures are 700 ℃ and 550 ℃, respectively.
Fe3(C,B)则在较长时间回火时由Fe3C转变而成,其形成的动力学曲线是以700℃和550℃为鼻尖的ε形。
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