Structure and Properties of a Welded Joint of a Corrosion-Resistant Nickel Alloy Used for Work in Molten Salts
摘要
In this paper, an isothermal diagram of the second phase formation in the Hastelloy G35 alloy was constructed to understand possible phase transformations during welding. A welded joint has been studied in three areas: fusion zone (FZ), the heat affected zone (HAZ), and the base metal (BM). The FZ is represented by a dendritic structure; in addition, σ-phase intermetallic compounds are present in the FZ and HAZ. Furthermore, the FZ and BM present similar hardness values, while the hardness increases in the HAZ. It has been established that thermal effects for different areas are characterized by different rates of increase up to 650°C.