Titanium Alloy Developments For Future Fan Disc Applications – The Fatigue Response of “Alloy 104”

Alloy 104 is a novel high strength, α+β titanium alloy primarily aimed at aero-engine fan disc applications. Two microstructural variants of Alloy 104 have been assessed. Room temperature tensile strength and elongation have been investigated alongside a more detailed study of low and high cycle fatigue behaviour. The alloy clearly demonstrated an improved fatigue resistance in both microstructural conditions, whilst maintaining forgeability and a comparable density to Ti-6Al-4V. Furthermore, the alloy has been subjected to a load regime with a hold period at peak loads and proven to be insensitive to dwell fatigue.

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Effect of frequency and biofuel E85 on very high cycle fatigue behaviour of the high strength steel X90CrMoV18

International Journal of Fatigue ◽

10.1016/j.ijfatigue.2013.06.005 ◽

2014 ◽

Vol 60 ◽

pp. 90-100 ◽

Cited By ~ 11

Author(s):

S. Schmid ◽

M. Hahn ◽

S. Issler ◽

M. Bacher-Hoechst ◽

Y. Furuya ◽

...

Keyword(s):

High Strength Steel ◽

High Cycle Fatigue ◽

High Strength ◽

Fatigue Behaviour ◽

Cycle Fatigue ◽

Very High Cycle Fatigue ◽

Very High

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Effect of Hot Processing on Mircrostructure and Properties of Flat Billets of TA15 Titanium Alloy

Materials Science Forum ◽

10.4028/www.scientific.net/msf.1016.906 ◽

2021 ◽

Vol 1016 ◽

pp. 906-910

Author(s):

Xin Hua Min ◽

Cheng Jin

Keyword(s):

Mechanical Properties ◽

Heat Treatment ◽

Titanium Alloy ◽

High Temperature ◽

Room Temperature ◽

High Strength ◽

Slow Cooling ◽

Microstructure And Mechanical Properties ◽

Ta15 Titanium Alloy ◽

The Ideal

In this paper,effect of the different forging processes on the microstructure and mechanical properties of the flat flat billets of TA15 titanium alloy was investigated.The flat billiets of 80 mm×150 mm×L sizes of TA15 titanium alloy are produced by four different forging processes.Then the different microstrure and properties of the flat billiets were obtained by heat treatment of 800 °C~850 °C×1 h~4h.The results show that, adopting the first forging temperature at T1 °C、slow cooling and the second forging temperature at T2°C 、quick cooling, the primary αphases content is just 10%, and there are lots of thin aciculate phases on the base. This microstructure has both high strength at room temperature and high temperature, while the properties between the cross and lengthwise directions are just the same. So the hot processing of the first forging temperature at T1 °C、slow cooling and the second forging temperature at T2°C 、quick cooling is choosed as the ideal processing for production of aircraft frame parts.

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Effects of Loading Frequency and Specimen Geometry on High Cycle and Very High Cycle Fatigue Life of a High Strength Titanium Alloy

Materials ◽

10.3390/ma11091628 ◽

2018 ◽

Vol 11 (9) ◽

pp. 1628 ◽

Cited By ~ 5

Author(s):

Yanqing Li ◽

Qingyuan Song ◽

Shichao Feng ◽

Chengqi Sun

Keyword(s):

Titanium Alloy ◽

Fatigue Life ◽

Fatigue Test ◽

High Cycle Fatigue ◽

High Strength ◽

Specimen Geometry ◽

Ultrasonic Frequency ◽

Loading Frequency ◽

Very High Cycle Fatigue ◽

Very High

Titanium alloys have been widely used in the structural parts of deep-sea equipment and aviation industries. In this paper, the effects of loading frequency and specimen geometry on the high cycle and very high cycle fatigue life of the high strength titanium alloy Ti-6Al-2Sn-2Zr-3Mo-X is investigated by conventional fatigue test and ultrasonic frequency fatigue test. The results indicate that ultrasonic frequency could enhance the fatigue life of the highstrength titanium alloy compared with that under conventional frequency, and the frequency effect is related to the stress amplitude. This phenomenon is explained by the heat generation in specimens and heat dissipation, in combination with the high strain rate leading to the higher yield strength in the ultrasonic fatigue test. Moreover, it is indicated that the effect of specimen geometry on the fatigue life of the highstrength titanium alloy could be evaluated from the view of control volume.

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Effect of Rise and Fall Time on Dwell Fatigue Behavior of a High Strength Titanium Alloy

Metals ◽

10.3390/met9080914 ◽

2019 ◽

Vol 9 (8) ◽

pp. 914 ◽

Cited By ~ 4

Author(s):

Qingyuan Song ◽

Yanqing Li ◽

Lei Wang ◽

Ruxu Huang ◽

Chengqi Sun

Keyword(s):

Titanium Alloy ◽

Fatigue Life ◽

Crack Initiation ◽

Cross Section ◽

Fatigue Behavior ◽

Circular Cross Section ◽

High Strength ◽

Initiation Mechanism ◽

Fall Time ◽

Dwell Fatigue

Frequency is an important factor influencing the fatigue behavior. Regarding to the dwell fatigue, it corresponds to the effect of rise and fall time, which is also an important issue especially for the safety evaluation of structure parts under dwell fatigue loading, such as the engines of aircrafts and the pressure hulls of deep-sea submersibles. In this paper, the effect of rise and fall time (2 s, 20 s, 110 s, and 200 s) on the dwell fatigue behavior is investigated for a high strength titanium alloy Ti-6Al-2Sn-2Zr-3Mo-X with basket-weave microstructure. It is shown that the dwell fatigue life decreases with increasing the rise and fall time, which could be correlated by a linear relation in log–log scale for both the specimen with circular cross section and the specimen with square cross section. The rise and fall time has no influence on the crack initiation mechanism by the scanning electron microscope observation. The cracks initiate from the specimen surface and all the fracture surfaces present multiple crack initiation sites. Moreover, the facet characteristic is observed at some crack initiation sites for both the conventional fatigue and dwell fatigue tests. The paper also indicates that the dwell period of the peak stress reduces the fatigue life and the dwell fatigue life seems to be longer for the specimen with circular cross section than that of the specimen with square cross section.

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