Abstract
One of the important criteria for selection titanium alloys for discs and blades of turbine engine compressor is their fatigue and creep strength at room and elevated temperature. Fatigue and creep properties of two-phase titanium alloys show strong dependence on microstructure, especially morphology of the α and β phases which can be controlled to certain extent by proper selection of hot working and heat treatment conditions. Quantitative description of two-phase titanium alloys behaviour under loading and environmental conditions leading to combined creep and fatigue processes has been always very challenging task due to large number of factors affecting deformation and fracture behaviour of the material. In the course of the research cyclic creep behaviour of Ti-6Al-2Mo-2Cr alloy (VT3-1) was investigated and compared to low-cycle fatigue and static creep properties at the temperature of 450°C. Microstructure of the alloy was varied by means of the heat treatment. Constant load tensile creep tests were carried out. Tension-tension cyclic loading was applied at the constant stress ratio with and without hold time at maximum load. The effect of test parameters on the creep-fatigue life at elevated temperature was estimated. Characteristic features of fracture surfaces were identified by scanning electron microscopy methods.
Highlights
There has been still growing demand for titanium alloys over the last decades
Two-phase titanium alloy Ti-6Al-2Mo-2Cr with lamellar and globular microstructure was examined in constant load creep, low-cycle fatigue and cyclic creep tests at 450°C
Low-cycle fatigue life data for the alloy with lamellar and globular microstructure superimposed when plotted against normalized cyclic stress, showing no significant dependence on the microstructure
Summary
There has been still growing demand for titanium alloys over the last decades It stems from the combination of their advantageous properties like high specific strength at room and elevated temperature, fracture toughness and corrosion resistance which makes them the important structural material in chemical, energy and aerospace industries [1,2,3]. In the case of discs and blades in compressor section of the turbine aero engines near-α and two-phase α+β alloys are predominantly used, for which maximum operational temperature reaches about 650°C and 450°C respectively In this kind of applications fatigue and creep strength criteria at room and elevated temperature are of primary importance in the material selection process [5]. The facets typically have a basal plane orientation [16,17]
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