The Mechanism of Internal Fatigue-Crack Initiation in a Titanium Alloy with Lamellar and Equiaxed Microstructure

2019 ◽  
Author(s):  
Xiangnan Pan ◽  
Shouwen Xu ◽  
Guian Qian ◽  
Alexander Nikitin ◽  
Andrey Shanyavskiy ◽  
...  
Keyword(s):  
Titanium Alloy ◽  
Fatigue Crack ◽  
Crack Initiation ◽  
Fatigue Crack Initiation ◽  
Equiaxed Microstructure

scholarly journals The mechanism of internal fatigue-crack initiation and early growth in a titanium alloy with lamellar and equiaxed microstructure

2020 ◽  
Vol 798 ◽  
pp. 140110
Author(s):  
Xiangnan Pan ◽  
Shouwen Xu ◽  
Guian Qian ◽  
Alexander Nikitin ◽  
Andrey Shanyavskiy ◽  
...  
Keyword(s):  
Titanium Alloy ◽  
Fatigue Crack ◽  
Crack Initiation ◽  
Fatigue Crack Initiation ◽  
Early Growth ◽  
Equiaxed Microstructure

Stress-sensitive fatigue crack initiation mechanisms of coated titanium alloy

2021 ◽  
pp. 117179
Author(s):  
Yanyun Bai ◽  
Tao Guo ◽  
Jiawei Wang ◽  
Jin Gao ◽  
Kewei Gao ◽  
...  
Keyword(s):  
Titanium Alloy ◽  
Fatigue Crack ◽  
Crack Initiation ◽  
Fatigue Crack Initiation

Corrosion fatigue crack initiation in ultrafine-grained near-α titanium alloy PT7M prepared by Rotary Swaging

2019 ◽  
Vol 790 ◽  
pp. 347-362 ◽  
Author(s):  
V.N. Chuvil'deev ◽  
V.I. Kopylov ◽  
N.N. Berendeev ◽  
A.A. Murashov ◽  
A.V. Nokhrin ◽  
...  
Keyword(s):  
Titanium Alloy ◽  
Fatigue Crack ◽  
Crack Initiation ◽  
Corrosion Fatigue ◽  
Fatigue Crack Initiation ◽  
Corrosion Fatigue Crack ◽  
Rotary Swaging ◽  
Ultrafine Grained

Thermal Fatigue Crack Initiation of Laser Deposited High-temperature Titanium Alloy Ti60A in 20–700 °C

2013 ◽  
Vol 32 (4) ◽  
pp. 331-337 ◽  
Author(s):  
A.L. Zhang ◽  
D. Liu ◽  
H.M. Wang
Keyword(s):  
Titanium Alloy ◽  
Fatigue Crack ◽  
High Temperature ◽  
Crack Initiation ◽  
Thermal Fatigue ◽  
Fatigue Cracks ◽  
Fatigue Crack Initiation ◽  
Thermal Fatigue Crack ◽  
Fatigue Process ◽  
Thermal Fatigue Cracks

AbstractThermal fatigue damage of high-temperature titanium alloys is of great concern for severe temperature-fluctuating environment, and the thermal fatigue crack initiation stage plays a crucial role in thermal fatigue life. In present study, thermal fatigue tests keeping 55 seconds at 700 °C followed by water cooling 15 seconds at 20 °C were performed for the laser deposited high-temperature titanium alloy Ti60A (Ti5.54Al3.38Sn3.34Zr0.37Mo0.46Si). Thermal fatigue cracks initiate after 800 thermal fatigue cycles with a length of 20 µm. Subsequently numerous cracks grow to 500 µm and cause severe degradation after 1000 cycles. To investigate the crack initiation behavior, microstructural changes during thermal fatigue process were examined by OM, SEM, EPMA and TEM. Thermal fatigue cracks initiate preferably at grain boundaries, α/β interfaces, microvoids, and abnormal coarsened α produced by oxygen interstitial solution. Mechanisms of thermal fatigue crack initiation are related to compatibility of local deformation and microstructural changes during thermal fatigue process.

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