Phase transition study of Al-Si Co-deposited martensitic steel

Abstract

The oxidation performance at elevated temperatures for Al-Si coated Martensitic Stainless Steel AISI 410 was investigated. The pack aluminizing at 1050°C for 3 h was employed for the co-deposition of Al and Si onto the alloy. The microstructural performance and material’s response towards oxidation and corrosion behavior along with phase transition at 1100°C with various exposure periods have been observed. In particular, the Al2O3, Al2SiO5, Fe2SiO4, Cr2SiO4, etc. are the protective oxides, resulting from oxidation, decreasing the DoS. The Al2O3 and Al2SiO5 are observed as responsible for protective oxide phases. The highest mass gain was obtained during the period of 16 h to 20 h due to the formation of protective oxides. The increment in the degree of spallation has been observed for the oxidation period of 12h to 16 h. The hot corrosion resistance of the bared and the coated sample was observed in a salt-based environment and found satisfactory results for Al-Si coated alloy for a 12 h to 24 h exposure period.