US 11,807,911 B2
Heat treatment method for titanium-aluminum intermetallic and heat treatment device therefor
Hong-Yuan Sun, Kaohsiung (TW); and Chen-Hsueh Chang, Kaohsiung (TW)
Assigned to METAL INDUSTRIES RESEARCH & DEVELOPMENT CENTRE, Kaohsiung (TW)
Filed by METAL INDUSTRIES RESEARCH & DEVELOPMENT CENTRE, Kaohsiung (TW)
Filed on Dec. 15, 2021, as Appl. No. 17/551,251.
Prior Publication US 2023/0183830 A1, Jun. 15, 2023
Int. Cl. C21D 9/08 (2006.01); C22C 21/00 (2006.01); C22C 14/00 (2006.01)
CPC C21D 9/08 (2013.01) [C22C 14/00 (2013.01); C22C 21/003 (2013.01)] 4 Claims
OG exemplary drawing
 
1. A heat treatment method for a titanium-aluminum (TiAl) intermetallic, comprising the following steps:
providing a TiAl intermetallic casting material;
performing a first-stage heat treatment on the TiAl intermetallic casting material, wherein the TiAl intermetallic casting material is heated until a metallographic structure thereof is transformed into an α+γ phase, and is then cooled to room temperature to form a transitional casting material; and
performing a second-stage heat treatment on the transitional casting material, wherein the transitional casting material is heated until a metallographic structure thereof is transformed into an α single phase, and is then cooled to room temperature to form a TiAl intermetallic;
wherein a temperature range of the first-stage heat treatment refers to a temperature range where the metallographic structure of the TiAl intermetallic casting material is transformed into the α+γ phase, the temperature range of the first-stage heat treatment is 1000-1250° C. and a heat preservation time is 2-4 hours; and
wherein a temperature range of the second-stage heat treatment refers to a temperature range where the metallographic structure of the transitional casting material is transformed into the α single phase, the temperature range of the second-stage heat treatment is 1300-1450° C., and a heat preservation time is 10-20 minutes.