Microstructural Evolution of Laser-Clad IN625 Powder on Rene80 Superalloy

Journal of Environmental Friendly Materials

مقاله 5، دوره 6، شماره 2 - شماره پیاپی 12، اسفند 2022، صفحه 23-26   

نوع مقاله: Original Article

نویسندگان

M Taheri¹؛ A Salemi Golezani²

¹Department of Materials Engineering, South Tehran Branch, Islamic Azad University, Tehran, Iran

²Department of Materials Engineering, Karaj Branch, Islamic Azad University, Karaj, Iran

چکیده

Nickel-based superalloys are one of the main components of fixed and moving blades of land and air gas turbines. Susceptibility of substrate and coating during Rene80 superalloy coating with IN625 was investigated by laser cladding method. For this purpose, the substrate was selected under two conditions of casting and solution heat treatment. Microstructural studies showed that the coating, despite maintaining its hardness due to NbC carbide and Ni2(Cr,Mo) phases, did not form cracks and pores. However, in the coating-substrate interface and heat affected zone of the casting sample, cracking occurred due to the high absorption of process stresses by MC carbide (TiC) and γ´ phase as well as partial melting of these two phases. However, in the case of heat treatment, due to the dissolution of these phases and the low hardness of the substrate, the conditions of non-stress absorption and stress release further reduced the sensitivity to cracking

کلیدواژه‌ها

Laser Cladding؛ Rene80؛ IN625؛ HAZ Crack