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In the development of the structural materials for the advanced applications, as in the aerospace industry, there is a constant strive to increase both strength and toughness. Maraging steels are iron-nickel alloys designed to combine both properties that are achieved through the age-hardening of low carbon martensite. This alloy have a metastable martensitic structure that can revert to austenite when heated in temperatures close to the aging temperature, and this effect can be enhanced with the temperature increasing and time of treatment. Therefore, the study of creep behavior in elevated temperatures has technological importance to the development of this material. In this work the creep behavior of a maraging 300 steel solution annealed is evaluated by carrying out creep tests at 650oC and in a stress of 200, 300 and 500 MPa. Creep parameters, such as steady state creep rate (ε?̇?), final creep time (tf), and stress exponent from secondary creep (n) are determined, considering that they are important to evaluate the creep resistance of the material.

CREEP PROPERTIES AT 650ºC OF MARAGING 300 STEEL SOLUTION ANNEALED