用热膨胀相变仪测定了贝氏体析出硬化钢10Ni3MnCuAl的连续加热转变曲线,并探讨了加热过程中的相变机制.结果表明,当加热速率小于1℃/s时,在300-600℃之间发生析出反应,为扩散型相变;在600-900℃之间,奥氏体化过程分两个阶段进行.第一阶段转变为扩散型相变,扩散激活能为505kJ/mol,第二阶段转变为切变型相变,较低的加热速率是造成奥氏体化过程分为两个阶段的原因.加热速率大于1℃/s时,无析出反应,奥氏体化过程只有一个阶段为切变机制.
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