Production and Characterization of Oxides Formed on Grade 300 and 350 Maraging Steels Using two Oxygen/Steam Rich Atmospheres

The growing process of a spinel-like oxide film can be obtained through different atmospheres; in this sense Air, O2, steam, and nitrogen atmospheres were used steps during the aging heat treatment at 490ºC maraging 300 350 alloys. oxidation layer produced under was chemically, microstructurally mechanically characterized by means advanced techniques. results showed (in both alloys) non-homogeneous mix formed magnetite, nickel cobalt ferrites MoO3 heterogeneously distributed along thickness. It also founded TiO2 innermost areas particularly important quantify hematite on external surface. A nickel-rich austenite phase interphase due to combination stability preference cobalt, molybdenum, iron diffuses as ions. highest thickness values found oxides steels which could indicate greater susceptibility comparing with grade steel. films alloys using air atmosphere presents excellent adherence, show capability for being tribological applications sliding contact tests.