The Fractography Analysis of IN 718 Alloy after Fatigue Test

2014 ◽  
Vol 635 ◽  
pp. 9-12 ◽  
Author(s):  
Juraj Belan
Keyword(s):  
Fatigue Test ◽  
High Cycle Fatigue ◽  
High Strength ◽  
Cycle Fatigue ◽  
Corrosion Resistant ◽  
International Nickel Company ◽  
Nickel Chromium ◽  
In718 Superalloy ◽  
Fracture Features ◽  
Very High

The Inconel’s alloy IN 718 has been developed by International Nickel Company in early 50-ties of 20thcentury. It is high-strength; corrosion-resistant nickel chromium material used at temperature range from-250°C up to 705°C. In this study, the high cycle fatigue (HCF) and very high cycle fatigue (VHCF) properties of IN718 superalloy with given chemical composition were investigated under push-pull high frequency fatigue test at room temperature. A S – N curve was obtained after testing. With the help of scanning electron microscope (SEM), fractography analyses were performed to disclose the fracture features of specimens in different life ranges.

On effect of hydrogen on very high cycle fatigue behaviours of high strength steels

2013 ◽  
Vol 29 (11) ◽  
pp. 1290-1296 ◽  
Author(s):  
J-B Shi ◽  
Y D Li ◽  
W M Guo ◽  
N Xu ◽  
X F Wu ◽  
...  
Keyword(s):  
High Cycle Fatigue ◽  
High Strength Steels ◽  
High Strength ◽  
Cycle Fatigue ◽  
Very High Cycle Fatigue ◽  
Very High

Very High Cycle Fatigue Testing under Spectrum Loading for Endurance Limit Structural Design

2020 ◽  
Vol 65 (1) ◽  
pp. 1-7
Author(s):  
David T. Rusk ◽  
Robert E. Taylor ◽  
Bruce A. Pregger ◽  
Luis J. Sanchez
Keyword(s):  
Fatigue Test ◽  
Test Data ◽  
High Cycle Fatigue ◽  
Fatigue Testing ◽  
Crack Nucleation ◽  
Peak Stress ◽  
Material Behavior ◽  
Cycle Fatigue ◽  
Very High Cycle Fatigue ◽  
Very High

A program has recently concluded that generated fatigue test data for the influence of a rotorcraft main rotor blade root bending spectrum (Helix) on the crack nucleation mechanisms in 7075-T651 aluminum. High-frequency tests were performed that generated spectrum fatigue failures out to nearly 109 cycles. Fractographic examination showed a distinct change in crack nucleation from slip initiated to inclusion-initiated cracking as the spectrum peak stress level was increased. Spectrum life predictions were made using three different baseline constant-amplitude S-N curves, one using a traditional rotorcraft original equipment manufacturer fitting methodology, one using the high-cycle fatigue (HCF) portion of a strainlife curve, and one that was fitted to S-N data with test lives out to 3×108 cycles. The spectrum life prediction using the S-N curve that properly modeled material behavior in the very high cycle fatigue regime provided a good correlation to the spectrum fatigue test data. Predictions using the other S-N curves were highly conservative.

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

Materials ◽  
2018 ◽  
Vol 11 (9) ◽  
pp. 1628 ◽  
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.

scholarly journals Mechanisms of interior crack initiation in very-high-cycle fatigue of high-strength alloys

2019 ◽  
Vol 212 ◽  
pp. 153-163 ◽  
Author(s):  
Xiaolong Liu ◽  
Erqing Chen ◽  
Fan Zeng ◽  
Tao Cong ◽  
Joseph P. Domblesky
Keyword(s):  
Crack Initiation ◽  
High Cycle Fatigue ◽  
High Strength ◽  
Cycle Fatigue ◽  
Very High Cycle Fatigue ◽  
Very High
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