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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。
The continuous heating transformation of bainite precipitation hardened steel 10Ni3MnCuAl was measured by thermal expansion phase change instrument, and the phase transformation mechanism during heating was discussed. The results show that when the heating rate is less than 1 ℃ / s, the precipitation reaction takes place between 300 and 600 ℃, which is a diffusion phase transition. The austenitizing process is carried out in two stages at 600 ~ 900 ℃. The first phase transforms into a diffusive phase transition with a diffusion activation energy of 505 kJ / mol. The second phase transforms into a shear phase transformation. The lower heating rate is the reason that the austenitization process is divided into two phases. When the heating rate is higher than 1 ℃ / s, there is no precipitation reaction and only one phase of the austenitization process is the shear mechanism.