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用金相显微镜研究了Fe-Ni15-Mo6-Ti合金,及在合金中增加Mo、Ti含量的合金再结晶过程。结果表明,合金以7～212℃/min加热到Ac以上,马氏体逆转变形成奥氏体。在保温时间一定的条件下,逆转奥氏体在某一温度以下是稳定的,具有原奥氏体晶粒的大小和形态;在某一温度以上则发生再结晶。再结晶开始的明显特点是平直化的多边形晶界变成弯曲波浪形晶界和晶界处优先出现小晶体。Mo和Ti提高了再结晶开始温度。利用再结晶处理,可以有效地细化奥氏体晶粒。循环加热再结晶处理,细化效果更佳。
The microstructure of Fe-Ni15-Mo6-Ti alloy and the recrystallization of Mo and Ti in the alloy were studied by metallographic microscope. The results show that the alloy is heated to above Ac at 7 ~ 212 ℃ / min, and the martensite reverses to form austenite. Reversal of austenite below a certain temperature is stable with the size and morphology of the original austenite grains at a certain holding time, and recrystallization occurs above a certain temperature. The obvious characteristic of the beginning of recrystallization is that the flattened polygonal grain boundaries become preferentially small crystals with curved wavy grain boundaries and grain boundaries. Mo and Ti increase the recrystallization start temperature. Using recrystallization, austenite grains can be effectively refined. Circulation heating recrystallization treatment, refinement effect is better.