TIAL ALLOY PRODUCTION METHOD AND TIAL ALLOY

• Main Author: KUBUSHIRO, Keiji
• Format: Patent
• Language: English; French; German
• Published: 31.05.2023
• Subjects: ALLOYS; CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS ANDNON-FERROUS ALLOYS; CHEMISTRY; FERROUS OR NON-FERROUS ALLOYS; METALLURGY; TREATMENT OF ALLOYS OR NON-FERROUS METALS

A method of manufacturing a TiAl alloy includes a casting step of melting and casting a TiAl alloy raw material which contains 42 at% or more and 45 at% or less of Al, 3 at% or more and 6 at% or less of Nb, 3 at% or more and 6 at% or less of V, 0.1 at% or more and 0.3 at% or less of B, and the balance being Ti and inevitable impurities, a hot forging step of hot forging the cast TiAl alloy by heating the cast TiAl alloy to a temperature range between 1200 °C or higher and 1350 °C or lower, and a thermal treatment step of holding the hot-forged TiAl alloy at a temperature range between 1220 °C or higher and 1300 °C or lower for a hour range between 1 hour or longer and 5 hours or shorter, applying a first thermal treatment to the hot-forged TiAl alloy, cooling the TiAl alloy subjected to the first thermal treatment to a temperature range between 1000 °C or higher and 1100 °C or lower at a cooling rate of 400 °C/hour or more, holding the TiAl alloy subjected to the first thermal treatment at a temperature range between 1000 °C or higher and 1100 °C or lower for a hour range between 1 hour or longer and 4 hours or shorter, applying a second thermal treatment to the TiAl alloy subjected to the first thermal treatment, and rapidly cooling the TiAl alloy subjected to the second thermal treatment.