Influence of High Temperature Processing on the Substructure of Laser Shock Processed Titanium Alloy

2014 ◽  
Vol 528 ◽  
pp. 44-53
Author(s):  
Yin Qun Hua ◽  
Yu Chuan Bai ◽  
Yun Xia Ye ◽  
Qing Xue ◽  
Hai Xia Liu ◽  
...  
Keyword(s):  
Titanium Alloy ◽  
High Temperature ◽  
Room Temperature ◽  
Laser Shock ◽  
Laser Shock Processing ◽  
Hardness Tester ◽  
Average Hardness ◽  
Transmission Electron ◽  
High Temperature Processing ◽  
Shock Processing

The paper aims to study the influence of high temperature processing on the substructure of laser shock processed titanium alloy. The titanium alloy specimens were first treated by laser shock processing (LSP), then treated at 700°C for three hours and air cooled to the room temperature to investigate the influence of the high temperature processing. To evaluate such influence, the hardness and substructure on the surface were investigated by micro hardness tester and transmission electron microscope (TEM), respectively. Results show that after three times LSP, the hardness of TC11 alloy was improved by 30.9%. The cause of such an improvement in hardness is that the crystal grains in the surface layer under the shock wave stress were strongly deformed, causing a dynamic recrystallization. The substructure is mainly twin crystals, highly tangled and dense dislocations. After high temperature processing in vacuum, the average hardness is decreased by 12% compared to that of the specimens after LSP. And the substructures are mainly small dislocation, nanocrystalline.

Effects of Laser Shock Processing on Fatigue Performance of Ti-17 Titanium Alloy

2017 ◽  
Vol 36 (3) ◽  
pp. 285-290 ◽  
Author(s):  
Shuai Huang ◽  
Ying Zhu ◽  
Wei Guo ◽  
Hongchao Qiao ◽  
Xungang Diao
Keyword(s):  
Titanium Alloy ◽  
Electron Microscope ◽  
Stress Ratio ◽  
Fatigue Performance ◽  
Fatigue Properties ◽  
Basic Material ◽  
Laser Shock ◽  
Laser Shock Processing ◽  
Transmission Electron ◽  
Shock Processing

AbstractTi-17 titanium alloy was treated by laser shock processing (LSP) and the high-frequency fatigue properties were evaluated. The fatigue fracture and the microstructures were observed by scanning electron microscope (SEM) and transmission electron microscope (TEM). The result shows that the average fatigue life of the LSP sample increases 2.62 times at maximum stress 300 MPa under stress ratio is 0.1. The micro-hardness of the samples subjected to LSP increases 20 % compared with the basic material. The proliferation and tangles of dislocations of Ti-17 occurs and the density of dislocation increases after LSP treatment. The high dislocation density of LSP impacts changes the initiation of crack from corner to subsurface, and hinders the crack extension, thus increases the fatigue performance of the Ti-17.

Laser Shock Processing of Titanium Alloy Blade and FEM Simulation

2013 ◽  
Vol 456 ◽  
pp. 125-128
Author(s):  
Bing Yan ◽  
Rui Wang
Keyword(s):  
Residual Stress ◽  
Titanium Alloy ◽  
Residual Stresses ◽  
Fem Simulation ◽  
Laser Shock ◽  
Laser Shock Processing ◽  
Tc4 Titanium Alloy ◽  
Compressive Stresses ◽  
Maximum Value ◽  
Shock Processing

The aim of this article is to analyze the residual stresses field in a TC4 titanium alloy blade by laser shock processing (LSP).LSP is a new surface processing technology, it uses the laser shock wave to act on the surface of the target and form residual compressive stresses field. The ABAQUS software is applied to simulate the LSP of TC4 titanium alloy blade, and the distributions of the residual stresses field are analysed.After single LSP,the maximum value of residual stress on the surface is 309 MPa.The residual stresses on the surface increase first and then decrease.The residual stresses at the depth continue decreasing with the increase of the depth.After multiple LSP,the maximum value of residual stress on the surface is increased and plastically affected depth is increased.

Thermostablity Study on Microstructure and Microhardness of Laser Shock Processed Ti-6Al-2.5Mo-1.5Cr-0.5Fe-0.3Si

2011 ◽  
Vol 697-698 ◽  
pp. 440-444 ◽  
Author(s):  
Qi Peng Li ◽  
Ying Hong Li ◽  
W. He ◽  
Yu Qin Li ◽  
Xiang Fan Nie ◽  
...  
Keyword(s):  
Titanium Alloy ◽  
Cross Section ◽  
High Strain ◽  
Microscopic Structure ◽  
Laser Shock ◽  
Laser Shock Processing ◽  
Fine Grain ◽  
High Strain Rate Deformation ◽  
The Usa ◽  
Shock Processing

In this paper, the microstructure and microhardness of laser shock processed (LSP) Ti-6Al-2.5Mo-1.5Cr-0.5Fe-0.3Si titanium alloy with and without annealing were examined and compared. The titanium alloy samples were LSP processed with 3 layers at 4.24GW/cm2. Some of the samples were vacuum annealed at 623K for 10 hours. The microscopic structure with and without annealing were tested and analyzed by SEM, TEM. The results indicated that after LSP, the shock wave provided high strain rate deformation and led to the formation of ultra-fine grain. Comparing with the samples without annealing, the dislocation density was lower and the grain-boundary was more distinct in the annealed samples, but the sizes of the ultra-fine grain didn’t grow bigger after annealing. On the other hand, the microhardness measurement was made on the cross-section. It is obviously that the laser shock processing improved the microhardness of the Ti-6Al-2.5Mo-1.5Cr-0.5Fe-0.3Si for about 12.2% at the surface, and the hardness affected depth is about 500 microns. The microhardness after annealing is 10 HV0.5lower, but the affected depth is not changed. The titanium alloy after LSP is thermostable at 623K; thus break the USA standard AMS2546, in which titanium parts after LSP are subjected in subsequent processing should not exceed 589K.

Effects of Laser Shock Processing on High Temperature Fatigue Properties and Fracture Morphologies of K403 Nickel-Based Alloy

2014 ◽  
Vol 41 (9) ◽  
pp. 0903001
Author(s):  
罗思海 Luo Sihai ◽  
何卫锋 He Weifeng ◽  
周留成 Zhou Liucheng ◽  
赖志林 Lai Zhilin ◽  
柴艳 Chai Yan ◽  
...  
Keyword(s):  
High Temperature ◽  
Fatigue Properties ◽  
Laser Shock ◽  
Laser Shock Processing ◽  
High Temperature Fatigue ◽  
Nickel Based Alloy ◽  
Shock Processing ◽  
Fracture Morphologies

Investigations on TC4-DT titanium alloy using laser shock processing with high energy

2012 ◽  
Vol 10 (s2) ◽  
pp. S21408-321410 ◽  
Author(s):  
Zhigang Che Zhigang Che ◽  
Jianhui Dai Jianhui Dai ◽  
Haiying Xu Haiying Xu ◽  
Shikun Zou Shikun Zou ◽  
Ziwen Cao Ziwen Cao
Keyword(s):  
Titanium Alloy ◽  
High Energy ◽  
Laser Shock ◽  
Laser Shock Processing ◽  
Shock Processing
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