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Abstract

The conjoint action of stress and environmental degradation in high temperature processes increasingly determines the material selection, process efficiency and economic viability of plant. Degradation through carburization is evidenced at the microscopical level in high temperature reactors and reformers and at a much greater level in many coal conversion processes and in ethylene pyrolysis furnaces. Metallic materials operating in such processes and coming into contact with the carburizing atmospheres are normally operating under stress in the high temperature creep regime. One commonly used metallic structural material is the austenitic Fe - Ni - Cr Alloy 800 H and, as it has been established that this alloy's room temperature ductility is destroyed through carburization and yet its creep ductility at the very high temperature of 1000 degrees is in fact enhanced, it is necessary to account for such a difference and equally importantly to assess the behaviour at intermediate temperatures. A temperature more consistent with coal conversion processes, 800 degrees C, is chosen as the main focal point of the present study but it is recognized that ductile - brittle transitions need to be discovered for thermal cycling characterisation and preliminary results from tests at lower temperatures are added for comparison.

Additional information

Authors: TAYLOR N G, JRC PETTEN ESTAB. (THE NETHERLANDS);GUTTMANN V, JRC PETTEN ESTAB. (THE NETHERLANDS);HURST R C JRC PETTEN ESTAB. (THE NETHERLANDS), JRC PETTEN ESTAB. (THE NETHERLANDS)
Bibliographic Reference: INTERNATIONAL CONFERENCE ON HIGH TEMPERATURE ALLOYS - THEIR EXPLOITABLE POTENTIAL, PETTEN (THE NETHERLANDS), OCT. 15-16, 1985 WRITE TO CEC LUXEMBOURG, DG XIII/A2, POB 1907 MENTIONING PAPER E 32358 ORA
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