Improved Damage Tolerance in Titanium Alloy Fan Blades With Low Plasticity Burnishing

2002 ◽  
Author(s):  
P. S. Prevey ◽  
D. J. Hornbach ◽  
T. L. Jacobs ◽  
R. Ravindranath
Keyword(s):  
Titanium Alloy ◽  
Damage Tolerance ◽  
Low Plasticity Burnishing

scholarly journals Damage Adaptive Titanium Alloy by In-Situ Elastic Gradual Mechanism

Materials ◽  
2020 ◽  
Vol 13 (2) ◽  
pp. 406
Author(s):  
Siqian Zhang ◽  
Jing Liu ◽  
Haoyu Zhang ◽  
Jie Sun ◽  
Lijia Chen
Keyword(s):  
Titanium Alloy ◽  
Damage Tolerance ◽  
Three Dimensional ◽  
Crack Tip ◽  
In Situ Stress ◽  
Crack Deflection ◽  
Adaptive Mechanism ◽  
Ultrafine Grained ◽  
Elastic Gradient

Natural materials are generally damage adaptive through their multilevel architectures, with the characteristics of compositional and mechanical gradients. This study demonstrated that the desired elastic gradient can be in-situ stress-induced in a titanium alloy, and that the alloy showed extreme fatigue-damage tolerance through the crack deflection and branch due to the formation of a three-dimensional elastically graded zone surrounding the crack tip. This looks like a perceptive and adaptive mechanism to retard the crack: the higher stress concentrated at the tip and the larger elastic gradient to be induced. The retardation is so strong that a gradient nano-grained layer with a thickness of less than 2 μm formed at the crack tip due to the highly localized and accumulated plasticity. Furthermore, the ultrafine-grained alloy with the nano-sized precipitation also exhibited good damage tolerance.

Effect of Near β Heat Treatment Process on Microstructure of TC18 Alloy

2013 ◽  
Vol 483 ◽  
pp. 110-114
Author(s):  
Hao Quan ◽  
Ke Hui Qiu ◽  
De Ming Huang ◽  
Jin Yan Liu ◽  
Rong Chen
Keyword(s):  
Heat Treatment ◽  
Titanium Alloy ◽  
Grain Boundary ◽  
Treatment Process ◽  
Damage Tolerance ◽  
Heat Treatment Process ◽  
Β Phase

The effects of near β heat treatment on the microstructure of TC18 alloy during three temperature stages were studied. The results show that the microstructure of the sample is tri-modal microstructure after near β heat treatment, and the size of αp does not significantly, but dispersible αs increases and has a tendency to merge, and then it would not grow up anymore ; β phase would grow up, but the grain boundary has some broken. The experiment result shows that the tri-modal microstructure could obtain high damage tolerance properties of titanium alloy in theory.

scholarly journals XFEM-Based Analysis for Crack Growth Characteristics of Diffusion Bonded Laminates of Titanium Alloy with Localized Nonwelded Zone

2013 ◽  
Vol 2013 ◽  
pp. 1-8 ◽  
Author(s):  
Yang Liu ◽  
Yongcun Zhang ◽  
Shutian Liu ◽  
Shan Xiao ◽  
Xiangming Wang ◽  
...  
Keyword(s):  
Titanium Alloy ◽  
Fatigue Crack ◽  
Fatigue Crack Growth ◽  
Crack Growth ◽  
Diffusion Bonding ◽  
Damage Tolerance ◽  
Crack Arrest ◽  
Growth Characteristics ◽  
Extended Finite Element ◽  
Quick Method

Titanium-alloy laminates fabricated by sheet materials using diffusion bonding process have drawn more and more attention in the recent years. Proper placement of nonwelded zones on the diffusion bonding (DB) interface within titanium-alloy laminates as crack arrest zones can improve damage tolerance. To achieve the optimal damage tolerance via designing non-welded zones, it is necessary to study fatigue crack growth characteristics for this type of laminates by adjusting all the relevant parameters such as geometrical sizes, locations, and the number of the nonwelded zones, which is highly time consuming. Therefore it is essential to develop a reliable and quick method to analyze the fatigue crack growth characteristics for titanium-alloy laminates with non-welded zones. In this paper, the extended finite element method (XFEM) which was employed to simulate the fatigue crack growth process and the applicability of this method to capture fatigue crack growth characteristics of titanium-alloy laminates with localized non-welded zones was also studied. The numerical results were compared with the experiment data, and the agreement on numerical and experimental results illustrated that the specific crack growth characteristics can be captured by using XFEM, thereby verifying the applicability of XFEM in the analysis of fatigue crack growth of the laminates with non-welded zones. The influence of non-welded zones on the fatigue crack growth was then discussed.

Damage Tolerance Improvement of Ti-6-4 Fan Blades With Low Plasticity Burnishing

2002 ◽  
Author(s):  
P. S. Prevey ◽  
D. J. Hornbach ◽  
J. T. Cammett ◽  
R. Ravindranath
Keyword(s):  
Damage Tolerance ◽  
Low Plasticity Burnishing ◽  
Tolerance Improvement

Studies of New-Type Titanium Alloys for Aviation Applications in China

2014 ◽  
Vol 687-691 ◽  
pp. 4362-4366
Author(s):  
Zhi Shou Zhu ◽  
Xin Nan Wang ◽  
Guo Qiang Shang
Keyword(s):  
Titanium Alloy ◽  
Titanium Alloys ◽  
Electron Beam Welding ◽  
Damage Tolerance ◽  
High Strength ◽  
Aviation Industry ◽  
Processing Technologies ◽  
High Toughness ◽  
New Type ◽  
Airframe Structures

The latest R&D of new-type titanium alloys and their aviation applications as well as the newly developed processing technologies in China have been reviewed in this paper. To meet the requirements of high performance and low cost design of aviation-oriented titanium alloys, great efforts and achievements have been made in establishing a system with Chinese characteristics, in which the low-strength-and-high-toughness titanium alloy (such as Ti45Nb alloy used for fasteners and TA18 for tubes & pipes), the medium-strength and high-damage-tolerance titanium alloy (such as TC4-DT used for large-integral airframe structures), the high-strength and high-toughness damage tolerance titanium alloy (such as TC21 used for large-integral airframe structures), and the ultra-high strength titanium alloy (such as TB8) are included. Some new processing technologies such as quasi-β forging and quasi-β heat treatment, integral isothermal forging and electron beam welding, have been demonstrated to be able to markedly enhance the properties of titanium alloys, which is regarded to be very important in increasing the application amount and level of titanium in aviation industry.

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