Influence of Surface Mechanical Attrition Treatment (SMAT) on Oxidation Behavior of 316L Stainless Steel at 650°C

Abstract

In this paper, the effects of Surface Mechanical Attrition Treatment on the high-temperature oxidation of AISI 316L austenitic stainless steel are investigated. Samples treated with different conditions were oxidized at 650 o C in order to study the effect of this type of nanocrystallisation on the oxidation resistance of the alloy concerned. X-ray diffraction and in-situ Raman spectroscopy were used to identify the oxides formed at the surface. The results indicate the presence of hematite and chromium oxides. Experimental results obtained by Raman spectroscopy were also used to study the stress evolution in Cr2O3 films during isothermal conditions.

Numerical analysis of highly reactive interfaces in processing of nanocrystallised multilayered metallic materials by using duplex technique

“…The presence of residual stresses in the oxide layers during oxidation may also influence the mechanical properties of the formed oxide layers. The thermogravimetric analysis revealed that the mass gain during 20 h oxidation of 316L steel samples at 650°C treated by SMAT was significantly higher than that of the untreated ones [32,33]. XRD and Raman spectroscopy results obtained by the same authors indicated presence of the main oxide phases in the formed oxide layer, such as Fe 2 O 3 , Fe 3 O 4 and Cr 2 O 3 .…”

“…Computer analysis of XRD measurements allowed for registration of some differences in the main oxide phase percentages between untreated and samples of 316L steel after SMAT. The untreated samples contained 36% Fe 2 O 3 , 6% Cr 2 O 3 and 58% austenite while the samples after SMAT contained 22% Fe 2 O 3 , 3% Cr 2 O 3 , 4% Fe 3 O 4 and about 69% austenite [32]. The selective oxidation of chromium could be associated with the formation of the fine-grain structure near the surface of the treated samples.…”