PHASE DIAGRAM CALCULATION AND EXPERIMENT FOR FE-MN-AL SYSTEM AT DIFFERENT TEMPERATURE

摘要

The phase equilibrium of the Fe-Mn-Al ternary system plays an important role in development of cryogenic alloys and heat-resistant steels. In the present work, the isothermal sections of Fe-Mn-Al system were calculated at different temperatures from 1500 °C to 400 °C at an interval of 100 °C. The calculated results indicate that there is a three-phase region (++Mn) from 1000 °C to 400 °C. The position of the three-phase region (++Mn) moves to the lower Mn content region with temperature decreasing. Besides, the relative experiments also processed by use of optical microscopy and electron probe after heat treatment for equilibrium condition.