Effects of α + β phase deformation on microstructure, fatigue and dwell fatigue behavior of a near alpha titanium alloy

2016 ◽  
Vol 91 ◽  
pp. 100-109 ◽  
Author(s):  
Vivek Chandravanshi ◽  
Kartik Prasad ◽  
Vajinder Singh ◽  
Amit Bhattacharjee ◽  
Vikas Kumar
Keyword(s):  
Titanium Alloy ◽  
Fatigue Behavior ◽  
Β Phase ◽  
Phase Deformation ◽  
Dwell Fatigue ◽  
Alpha Titanium

scholarly journals Normal and dwell fatigue behavior of a near-alpha titanium alloy - IMI 834

2020 ◽  
Vol 321 ◽  
pp. 04005
Author(s):  
K.U. Yazar ◽  
Anish Karmakar ◽  
Vivek Sahu ◽  
Amit Bhattacharjee ◽  
Satyam Suwas
Keyword(s):  
Titanium Alloy ◽  
Fatigue Life ◽  
Fatigue Behavior ◽  
Fatigue Loading ◽  
Large Plastic Strain ◽  
Dwell Fatigue ◽  
Order Of Magnitude ◽  
Alpha Titanium ◽  
Imi 834 ◽  
Fully Lamellar

Dwell sensitivity of titanium alloys at ambient temperature (~250 C) is a well-known phenomenon, although the question about the exact micromechanical reasons responsible for this still remains open. In this work, the normal and dwell fatigue response of a near-alpha titanium alloy, IMI 834, is studied. Samples with three different microstructures, namely, fully lamellar, fully equiaxed and bimodal, are evaluated for their dwell fatigue behaviors. A reduction in fatigue life by at least an order of magnitude is seen in all the three microstructures. Large plastic strain accumulation (almost equal to the monotonic ductility) was observed during the dwell fatigue loading condition and this is held responsible for this large debit in fatigue life. The normal fatigue lives decreased in the order, bimodal > fully equiaxed > fully lamellar, while the dwell fatigue lives decreased in the order, fully equiaxed > fully lamellar > bimodal. Bimodal microstructure showed a dwell fatigue debit of 17, while fully lamellar and fully equiaxed showed a debit of 9 and 10, respectively.

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

Metals ◽  
2019 ◽  
Vol 9 (8) ◽  
pp. 914 ◽  
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.

Microstructure and Texture Characterstics of a Near-Alpha Titanium Alloy Tube

2013 ◽  
Vol 683 ◽  
pp. 234-237 ◽  
Author(s):  
Yu Ting Zuo ◽  
Shu Feng Liu ◽  
Zhi Hui Zhang ◽  
Hui Na Ma ◽  
Wen Xia ◽  
...  
Keyword(s):  
Titanium Alloy ◽  
Volume Fraction ◽  
Extrusion Direction ◽  
Annealing Treatment ◽  
Fiber Texture ◽  
Electron Backscattered Diffraction ◽  
Texture Characteristic ◽  
Β Phase ◽  
Alpha Titanium ◽  
Titanium Alloy Tube

A near-alpha type titanium alloy Ti-4Al-1.5Mn tube was analyzed after extrusion deformation and annealing treatment. Electron backscattered diffraction is employed to explore the Microstructure and texture characteristic of the recrystallization alloy. The alloy is consisted of equiaxed α grains and fine β phase with {1 0-1 2} twins .It was found that the (10-10) fiber texture along the extrusion direction was the dominate texture in this alloy and the volume fraction was 40.7%.

scholarly journals Dwell-fatigue life dispersion of a near alpha titanium alloy

2009 ◽  
Vol 31 (3) ◽  
pp. 601-605 ◽  
Author(s):  
L TOUBAL ◽  
P BOCHER ◽  
A MOREAU
Keyword(s):  
Titanium Alloy ◽  
Fatigue Life ◽  
Dwell Fatigue ◽  
Alpha Titanium

Fatigue Properties of Titanium Alloy TA11 under Multiaxial Loadings with Tension - Bending Vibration

2014 ◽  
Vol 887-888 ◽  
pp. 873-877
Author(s):  
Bin Li ◽  
Nan Ma ◽  
Xin Ling Liu ◽  
Zhi Wang Qiu ◽  
Hong Ren Li
Keyword(s):  
Titanium Alloy ◽  
Fatigue Behavior ◽  
Fatigue Tests ◽  
Fatigue Properties ◽  
Loading Conditions ◽  
Test Results ◽  
Bending Vibration ◽  
Alpha Titanium ◽  
Vibration Loads ◽  
Multiaxial Loadings

This paper studied the fatigue behavior of the near alpha titanium alloy TA11 under multiaxial loading conditions with tension - bending vibration, to simulate the service stress state applied on the engine blades, where a large centrifugal force is superimposed with bending vibration loads. A plate-like specimen was used in the fatigue tests with different ratios between the tension and bending vibration loads, then, the energy based fatigue criteria were applied for correlation of the test results. The fatigue properties of titanium alloy TA11 under the specialized loading conditions are characterized and discussed.

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