The kinetics of oxide film growth on Maraging steel as described by space‐charge effects

Abstract

The oxidation kinetics of a grade 300 maraging steel in air at temperatures ranging from 300 to 600°C have been determined using Auger electron spectroscopy in conjunction with argon ion sputtering. A limited-thickness type of growth was observed up to the relatively high temperature of 480 OC. Above 480 "C, the kinetics were parabolic.A thin gold layer sputtered onto the surface before oxidation resulted in a change in the kinetics from limitedthickness to approximately parabolic growth at temperatures below 480"C, while it remained parabolic above 480 "C.The limited-thickness oxide growth is described in terms of space-charge effects, as outlined by the theory of Fromhold. Tbe insulating properties of a thin mixed spinel oxide present at the metaloxide interface is critical in bringing about the space charge in tbe oxide. A change in the electrical conductivity of the mixed spinel is associated with a change in the oxidation kinetics

Efeito Do Teor De Molibdênio Nas Curvas De Endurecimento Por Precipitação E Na Resistência À Oxidação a Altas Temperaturas De Aços Maraging De Ultra Alta Resistência Mecânica

“…Greyling et al [15] encontraram Fe 2 O 3 como o principal óxido formado para a oxidação ao ar a temperaturas entre 300 e 600°C de aços Maraging do tipo 18Ni(300).…”

A Short Review on Ultra-High-Strength Maraging Steels and Future Perspectives

“…Maraging steels are exposed to high temperatures during the several stages of its processing, such as during the homogenizing heat treatment after casting (1200-1250 °C), during solution annealing and austenitization (850-1100 °C) before quenching, and subsequent aging (400-500 °C). Figure 10 illustrates the oxide thickness variation with the exposure time in the air for the 300 to 600 °C temperature range 48 . Two types of behavior, both protective, are shown: between 300 and 480 °C the oxide layer growth is logarithmic, and between 500 and 600 °C is parabolic.…”

“…The work of Greyling et al 48 , carried out with Auger Electron Spectroscopy (AES), in conjunction with sputtering using argon ions (Argon Ion Sputtering; AIS), has performed a systematic study of the chemical composition of the oxide film, as shown in Figure 11 48 . Such a combination of techniques (AES/AIS) allows obtaining the variation of the chemical composition of the oxide film as a function of the distance.…”

“…Oxidation kinetics (variation of the oxide film thickness with exposure time) in the air of a maraging 300 steel at various temperatures48 .…”

Short-term Creep Properties and Fracture Surface of 18 Ni (300) Maraging Steel Plasma Nitrided

“…At 500°C and up to 600°C, the growth rate is faster and increases sharply with increase in temperature. The interaction of maraging steels with oxygen not only causes losses in the material during the formation of oxides but also causes embrittlement in the subsurface zone of the component due to oxygen enrichment, and the creep resistance is often the limiting parameter in design under different temperaturestress domains [5][6] . Therefore, for high temperature service in oxidizing atmospheres, satisfactory creep resistance must be combined with adequate resistance to environmental degradation.…”