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Phase changes in fifteen mainly austenitic iron-manganese-chromium alloys of different compositions are investigated over the temperature range -196 C to 1000 C, after different thermo-mechanical treatments. Electrical resistivity techniques, differential thermal analysis, magnetic response, Vickers hardness and XRD measurements are employed to investigate the structural changes occurring during heating, cooling and after cold-work. The transition temperatures for the epsilon to gamma and alpha to gamma transformations in the ternary alloys are found to be almost the same as those established for the binary iron-manganese phase diagrams. Depending on alloy composition, the epsilon(def)-phase can be induced by cold-working, the transformation occurring at a higher temperature than the reversible epsilon to gamma transformation. The phase boundary between the alpha-Fe-phase and the gamma-phase of the iron manganese alloy is approximately maintained if chromium is added to the two component materials. The new phase boundary between the alpha-Mn-phase and the gamma-phase extends far into the austenitic gamma -region. For these reasons the gamma-phase field of the iron-chromium-manganese alloys is very small below 600 C and much narrower than reported previously.

Additional information

Authors: SCHÜLE W, JRC Ispra (IT);LANG E, JRC Petten (NL)
Bibliographic Reference: Paper presented: 15th Symposium on Radiation Effects, Nashville, Tennessee (US), June 17-20, 1990
Availability: Available from (1) as Paper EN 35893 ORA
Record Number: 199110229 / Last updated on: 1994-12-02
Original language: en
Available languages: en
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