A CONTRIBUTION TO THE PHASE DIAGRAM OF FE - MN - CR ALLOYS
Fourteen mainly austenitic iron - chromium - manganese alloys of different compositions were investigated in temperature range: ambient to 1000 degrees C, after different thermomechanical pretreatments. Structural changes during heating, cooling, cold work were investigated using three techniques: electrical resistivity (2 methods: in situ with increasing - decreasing temperature varying the heating and cooling rates and by measuring the electrical resistivity in liquid nitrogen after quenching of the specimens), stored energy and susceptibility (in situ with increasing - decreasing temperatures) electron microscopy and x-rays were used to determine the structures of the different phases. The atomic mobility at 350 degrees C was found to suffice for obtaining the thermodynamic equilibrium state in suitable laboratory times. The phase boundaries decrease without change in composition both above and below 600 degrees C. In the gamma-phase no deviation from a statistical distribution of the component atoms with decreasing temperature. An indication for developing short range order in the alpha-phase of the investigated alloys and in the gamma-phase of 316 stainless steel was found. The transition temperatures for the transformations epsilon - gamma and for alpha - gamma and vice versa were identified. They are found hardly to vary with the chromium content and to be almost identical with those determined for iron- manganese.
Bibliographic Reference: 13TH SYMPOSIUM ON FUSION TECHNOLOGY, VARESE (ITALY), SEPT. 24-28, 1984 WRITE TO CEC LUXEMBOURG, DG XIII/A2, POB 1907 MENTIONING PAPER E 31726 ORA
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Record Number: 1989123082300 / Last updated on: 1987-01-01
Available languages: en