TECHNICAL-INFORMATION - MICROSTRUCTURE OF PHASE-HARDENED IRON-NICKEL ALLOYS

Thermal cycling treatment (TCT), including martensitic transformation, is an effective method for improving alloy properties. The set of pro perties for phase-hardened alloys is mainly governed by their structur e which in turn depends on phase transformations and the temperature a nd rate conditions for their occurrence. The aim of the present work i s to study the structure of iron - nickel alloys formed with repeated TCT, i.e., under conditions of crystal structure defect accumulation a nd a high level of phase hardening as a result of alternating direct a nd reverse martensitic transformation.