High-temperature oxidation behaviour of nanostructure surface layered austenitic stainless steel

Autor: Alvarez, Fernando, 1946
Přispěvatelé: UNIVERSIDADE ESTADUAL DE CAMPINAS
Rok vydání: 2022
Předmět:
Zdroj: Repositório da Produção Científica e Intelectual da Unicamp
Universidade Estadual de Campinas (UNICAMP)
instacron:UNICAMP
Popis: Agradecimentos: The authors would like to thank SERB [grant number: EMR/2017/001196] to support this research. The authors acknowledge NIMS, Japan TEM station, and SAIF facility at IIT Bombay for supporting TEM studies. The cooperation of Ms. Letícia T. Bim (UCS, Brazil) and Dr. Vinod Kumar’s research team (IITI) is acknowledged for GDOES and TGA experiments, respectively. DO also acknowledges Swedish Research Council (Vetenskapsrådet) for a financial support through a research grant # 2016-03811 Abstract: The present study investigates the high-temperature oxidation behaviour of nanostructure surface layered AISI 304L stainless steel. A severely deformed layer of -300 mu m thickness, consisting of nanoscale grains (-40 nm size) in the topmost region, is successfully developed using the surface mechanical attrition treatment (SMAT) process. The SMATed layer is substantially stable up to 700 degrees C; however, the surface hardness is reduced by -37% at 800 degrees C for 25 h oxidation duration. Glow discharge optical emission spectroscopy and X-ray photoelectron spectroscopy analysis revealed the considerable difference in the chemistry and elemental distribution across the oxide scale of SMATed and non-SMATed specimens. Adherent, denser, and thinner scale, dominated by nanocrystals of Cr- and Mn-rich oxides, is formed on the SMATed steel. However, the Fe-oxide dominated scale containing micro-crystals is found on the non-SMATed specimens, which shows noticeable exfoliation. A high density of grain boundaries and lattice defects in the SMATed layer display admirable reactive diffusion properties of Cr and Mn during oxidation of steel, instigating the formation of a protective oxide scale. The SMATed specimens exhibit multiple zones in the oxide scale: (i) Cr/Mn depleted outer layer, (ii) Cr-/Mn-rich inner layer, and (iii) gradually decreasing Cr/Mn region Fechado
Databáze: OpenAIRE
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