Effect of elevated temperature on the deformation of titanium alloys subjected to biaxial stress

1976 ◽  
Vol 8 (2) ◽  
pp. 233-235
Author(s):  
L. M. Shkaraputa
Keyword(s):  
Elevated Temperature ◽  
Titanium Alloys ◽  
Biaxial Stress

scholarly journals Properties of Novel High Temperature Titanium Alloys for Aerospace Applications

2020 ◽  
Vol 321 ◽  
pp. 04006
Author(s):  
John Mantione ◽  
Matias Garcia-Avila ◽  
Matthew Arnold ◽  
David Bryan ◽  
John Foltz
Keyword(s):  
Elevated Temperature ◽  
Titanium Alloys ◽  
Creep Resistance ◽  
Engine Performance ◽  
Beta Titanium Alloy ◽  
Elevated Temperature Strength ◽  
Jet Engine ◽  
Beta Titanium ◽  
Alpha Beta ◽  
Beta Titanium Alloys

The attractive combination of strength and low density has resulted in titanium alloys covering 15 to 25% of the weight of a modern jet engine, with titanium currently being used in fan, compressor and nozzle components. Typically, titanium alloys used in jet engine applications are selected from the group of near alpha and alpha-beta titanium alloys, which exhibit superior elevated temperature strength, creep resistance and fatigue life compared to typical titanium alloys such as Ti-6Al-4V. Legacy titanium alloys for elevated temperature jet engine applications include Ti-5Al-2Sn-2Zr-4Mo-4Cr, Ti-6Al-2Sn-4Zr-2Mo-0.1Si and Ti-4Al-4Mo-2Sn-0.5Si. Improving the mechanical behavior of these alloys enables improved component performance, which is crucial to advancing jet engine performance. As a world leader in supplying advanced alloys of titanium, nickel, cobalt, and specialty stainless steels, ATI is developing new titanium alloys with improved elevated temperature properties. These improved properties derive from precipitation of secondary intermetallics in alpha-beta titanium alloys. ATI has developed several new alpha-beta titanium alloy compositions which exhibit significantly improved elevated temperature strength and creep resistance. This paper will focus on the effects of chemistry and heat treat conditions on the microstructure and resulting elevated temperature properties of these new aerospace titanium alloys.

scholarly journals Cyclic creep behaviour of two-phase Ti-6Al-2Mo-2Cr alloy

2020 ◽  
Vol 321 ◽  
pp. 11079
Author(s):  
Waldemar Ziaja ◽  
Maciej Motyka ◽  
Krzysztof Kubiak ◽  
Jan Sieniawski
Keyword(s):  
Heat Treatment ◽  
Elevated Temperature ◽  
Titanium Alloys ◽  
Creep Behaviour ◽  
Strong Dependence ◽  
Cyclic Creep ◽  
Tensile Creep ◽  
Two Phase ◽  
Creep Properties ◽  
Cyclic Creep Behaviour

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.

scholarly journals Influence of Iron on the Size and Distribution of Metallic Lanthanum Particles in Free-Machining Titanium Alloys Ti 6Al 7Nb xFe 0.9La

2013 ◽  
Vol 765 ◽  
pp. 42-46 ◽  
Author(s):  
Florian Brunke ◽  
Eike Meyer-Kornblum ◽  
Carsten Siemers
Keyword(s):  
Mechanical Properties ◽  
Particle Size ◽  
Rare Earth ◽  
Elevated Temperature ◽  
Titanium Alloys ◽  
Room Temperature ◽  
Particle Distribution ◽  
Earth Metal ◽  
Homogeneous Particle ◽  
Micrometer Size

The addition of the rare earth metal Lanthanum to (α+β)-Titanium alloys like Ti 6Al 4V or Ti 6Al 7Nb improves their machinability as short chips form during machining. In related alloys, metallic Lanthanum is distributed as micrometer-size particles which are mainly located at the grain boundaries. In case Iron is present in Lanthanum containing (α+β)-Titanium alloys, a more homogeneous particle distribution is observed leading to improved ductility at room temperature and elevated temperature compared to Iron-free alloys. In the present study, the influence of Iron on the Lanthanum particle size and distribution was investigated in the system Ti 6Al 7Nb xFe 0.9La. First, the solidification behaviour was simulated. Afterwards, alloys with different amounts of Iron (0.25 %, 0.5 % and 1.0 %) were produced. The microstructure of these alloys as well as their deformability and mechanical properties at room temperature were analyzed which were improved compared to the Iron-free Ti 6Al 7Nb 0.9La and Ti 6Al 4V 0.9La alloys.

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