The partitioning of nitrogen atoms and its effect on the retained austenite content (RAC) during quenching and partitioning (Q&P) process were investigated by dilatometry, X-ray diffraction, and field emission transmission electron microscopy with energy-dispersive spectrometer mapping in a 00Cr13Mn8N steel. Nitrogen partitioning by diffusion of N atoms from martensite to austenite occurred at 400 °C after quenching. N atoms are enriched in austenite after partitioning, and the stability of these N-rich austenite is improved and retained at room temperature during subsequent cooling. The different quenching temperatures (QTs) result in different phase fractions after partitioning. With the increase in QT, RAC first increases and then decreases, and the maximum RAC is 28.5 vol.% after quenching at 80 °C. A mathematical model was developed to rapidly and accurately characterize the phase fraction in Q&P process based on the relative length change of the samples partitioned after quenching at different QTs.

在00Cr13Mn8N钢中用能量分散光谱仪进行了膨胀谱，X射线衍射和场发射透射电子显微镜研究了氮原子的分配及其对淬火和分配（Q＆P）过程中残余奥氏体含量（RAC）的影响。 。淬火后，在400°C时，氮原子从马氏体扩散到奥氏体而发生氮分配。分配后，奥氏体中富集了N原子，这些富N的奥氏体的稳定性得到改善，并在随后的冷却过程中保持在室温下。分配后，不同的淬火温度（QT）导致不同的相分数。随着QT的增加，RAC先升高然后降低，在80°C淬火后，最大RAC为28.5 vol。％。