Abstract
Titanium aluminide (TiAl) alloys have attracted to considerable interest as a material of blade in the low-pressure turbine section of aero engines since their superior specific strength. The mechanical properties and strengths of TiAl alloys are strongly sensitive to their microstructure controlled with thermo-mechanical processing. The collaborative research has been started from 2017 by the subcommittee on Titanium-Aluminide alloys, JSMS Committee on High Temperature Strength of Materials, in order to get basic information about the influence of microstructure on the high-temperature strength. This paper is a part of the collaborative research. The crack propagation tests were carried out under the load controlled out-of-phase type TMF (OP-TMF) loading condition with temperature range 400 ℃ -760 ℃ . The effect of microstructure on fatigue crack propagation behavior in was discussed.
Highlights
Titanium aluminide (TiAl) alloys have a high specific strength to creep and fatigue due to their low density, and oxidation resistance, and high melting temperature [1,2,3,4,5,6,7,8,9,10]
This paper deals with the effect of microstructure on the fatigue crack propagation behavior under the out-of-phase type TMF condition performed as a part of the collaborative research
The material tested in this study is a forged titanium aluminide alloy with a chemical composition 43 Al, 5V, 4Nb, and Ti balance
Summary
Titanium aluminide (TiAl) alloys have a high specific strength to creep and fatigue due to their low density, and oxidation resistance, and high melting temperature [1,2,3,4,5,6,7,8,9,10]. In the temperature range of 600–800 °C, TiAl alloys exhibit similar or better specific strength as compared with currently used Ni-base superalloys They alloys have attracted to considerable interest as a material of blade in the low-pressure turbine section of aero engines [1,2,3]. The collaborative research has been started from 2017 by the subcommittee on TitaniumAluminide alloys, JSMS Committee on High Temperature Strength of Materials, in order to get basic information about the influence of microstructure on the high-temperature strength This project covers strength in creep, high-temperature fatigue, creep-fatigue, thermo-mechanical fatigue, fretting fatigue, and crack propagation, targeting a TiAl alloy prepared by unified thermo-mechanical histories. This paper deals with the effect of microstructure on the fatigue crack propagation behavior under the out-of-phase type TMF condition performed as a part of the collaborative research
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