Abstract
This study investigated the effect of heat treatment on the microstructure and creep behavior of Ti–48Al–2Cr–2Nb alloy prepared by selective electron beam melting. The microstructure of the as-built and annealed TiAl alloys exhibited near γ structure and fully (α2/γ) lamellar structures, respectively. The creep properties were evaluated on the as-built and annealed TiAl alloys under a 250–300 MPa creep stress at 800 °C. The results showed that the creep property was improved significantly by post-heat treatment. The creep rupture life of heat-treated TiAl alloy was 1.6, 2.2, and 2.4 times that of as-built TiAl alloy under the stress of 250, 275, and 300 MPa at 800 °C, respectively. The creep stress exponents of the as-built TiAl alloy and heat-treated alloy were calculated and they were 8.94 and 5.96, respectively. Characterizing the fracture surfaces and deformed microstructure after the creep tests, the as-built alloy exhibited ductile fracture characteristics with numerous dimples. Whereas the heat-treated TiAl alloy displayed brittle fracture characteristics. Finally, the creep fracture behavior was discussed in detail.
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