Deforming TC6 titanium alloys at ultrahigh strain rates during multiple laser shock peening

Zhou, Lian; Li, Yinghong; He, Weifeng; He, Guangyu; Nie, Xiangfan; Chen, Donglin; Zhi-lin, Lai; An, Zhibin

doi:10.1016/j.msea.2013.04.070

Cited by 79 publications

(8 citation statements)

References 19 publications

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“…The accumulation of plastic deformation expands gradually to the inner layer of the material to refine grains. In this process, the deformation rate is low [23], while the surface grain refinement induced by laser plasma shock wave is plastic deformation at a very high rate [13]. …”

Section: Resultsmentioning

confidence: 99%

“…Therefore, the application of LSP in the high temperature service is an important issue. The LSP will not only form a large numerical residual compressive stress on the surface of the material, but it will also form a severe plastic deformation on the surface of the material [13]. When both a high density of dislocations and grain refinement were induced in the surface deformation layer, it improved the mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

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The strengthening mechanism of a nickel-based alloy after laser shock processing at high temperatures

Zhou

et al. 2013

Science and Technology of Advanced Materials

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We investigated the strengthening mechanism of laser shock processing (LSP) at high temperatures in the K417 nickel-based alloy. Using a laser-induced shock wave, residual compressive stresses and nanocrystals with a length of 30–200 nm and a thickness of 1 μm are produced on the surface of the nickel-based alloy K417. When the K417 alloy is subjected to heat treatment at 900 °C after LSP, most of the residual compressive stress relaxes while the microhardness retains good thermal stability; the nanocrystalline surface has not obviously grown after the 900 °C per 10 h heat treatment, which shows a comparatively good thermal stability. There are several reasons for the good thermal stability of the nanocrystalline surface, such as the low value of cold hardening of LSP, extreme high-density defects and the grain boundary pinning of an impure element. The results of the vibration fatigue experiments show that the fatigue strength of K417 alloy is enhanced and improved from 110 to 285 MPa after LSP. After the 900 °C per 10 h heat treatment, the fatigue strength is 225 MPa; the heat treatment has not significantly reduced the reinforcement effect. The feature of the LSP strengthening mechanism of nickel-based alloy at a high temperature is the co-working effect of the nanocrystalline surface and the residual compressive stress after thermal relaxation.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The strengthening mechanism of a nickel-based alloy after laser shock processing at high temperatures

Zhou

et al. 2013

Science and Technology of Advanced Materials

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“…Owing to machining, the residual stress of untreated sample is uniform −100 MPa. The negative symbol means compressive stress and the amplified compressive stress is beneficial to TC6 titanium alloy in defending against external force [32,33]. The LSP can induce high residual compressive stress along the depth direction.…”

Section: Residual Stressmentioning

confidence: 99%

Understanding the Relations between Surface Stress State and Microstructure Feature for Enhancing the Fatigue Performance of TC6 Titanium Alloy

Shu

Huang

Cheng³

et al. 2021

Coatings

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Fatigue performance has always been an important factor affecting the application of titanium alloy. The service life of TC6 titanium alloy is easily reduced under a continuously alternating load. Therefore, there is an urgent need for a new method to improve fatigue performance. Laser shock peening (LSP) is a widely proposed method to enhance the fatigue performance. Here, through experiments and finite element simulations, it was found that LSP can prolong the fatigue life of TC6 by improving the surface stress state. In strengthening processes, the generation of residual stress was mainly attributed to the change of microstructure, which could be reflected by the statistical results of grain sizes. The content of grains with a size under 0.8 μm reached 78%, and the microhardness value of treated TC6 was 18.7% higher than that of an untreated sample. In addition, the surface residual compressive stress was increased to −600 MPa at the depth of 1500 μm from the surface. On this basis, the fatigue life was prolonged to 135%, and the ultimate fracture macroscopic was also changed. With the treatment of LSP, the fatigue performance of TC6 is highly promoted. The strengthening mechanism of LSP was established with the aim of revealing the relationship between microstructure and stress state for enhancing the fatigue performance in whatever shapes.

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“…Compared with other surface treatment technologies, laser shock peening (LSP) have the remarkable advantages of not requiring contact with the substrate, of affecting a deep layer, and of having an excellent controllability, which makes LSP very suitable for complex structures, for example, aero-engine blades [ 11 , 12 , 13 ]. Similar to conventional shot peening, LSP is capable of refining grains and producing a surface nanostructured layer [ 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 ]. Recently, LSP has been used on the aero-engine components to improve the high cycle fatigue performance and to induce surface nanocrystallization of stainless steels [ 18 , 19 ], titanium alloys [ 20 , 21 , 22 ], and nickel-based superalloys [ 23 , 24 ] has been reported.…”

Section: Introductionmentioning

confidence: 99%

“…Similar to conventional shot peening, LSP is capable of refining grains and producing a surface nanostructured layer [ 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 ]. Recently, LSP has been used on the aero-engine components to improve the high cycle fatigue performance and to induce surface nanocrystallization of stainless steels [ 18 , 19 ], titanium alloys [ 20 , 21 , 22 ], and nickel-based superalloys [ 23 , 24 ] has been reported. Lu et al [ 14 , 15 , 16 ] discussed, in detail, the mechanism of grain refinement induced by LSP on LY2 aluminum alloy, AISI 304 stainless steel, and commercially pure titanium.…”

Section: Introductionmentioning

confidence: 99%

Surface Nanocrystallization and Amorphization of Dual-Phase TC11 Titanium Alloys under Laser Induced Ultrahigh Strain-Rate Plastic Deformation

et al. 2018

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As an innovative surface technology for ultrahigh strain-rate plastic deformation, laser shock peening (LSP) was applied to the dual-phase TC11 titanium alloy to fabricate an amorphous and nanocrystalline surface layer at room temperature. X-ray diffraction, transmission electron microscopy, and high-resolution transmission electron microscopy (HRTEM) were used to investigate the microstructural evolution, and the deformation mechanism was discussed. The results showed that a surface nanostructured surface layer was synthesized after LSP treatment with adequate laser parameters. Simultaneously, the behavior of dislocations was also studied for different laser parameters. The rapid slipping, accumulation, annihilation, and rearrangement of dislocations under the laser-induced shock waves contributed greatly to the surface nanocrystallization. In addition, a 10 nm-thick amorphous structure layer was found through HRTEM in the top surface and the formation mechanism was attributed to the local temperature rising to the melting point, followed by its subsequent fast cooling.

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Deforming TC6 titanium alloys at ultrahigh strain rates during multiple laser shock peening

Cited by 79 publications

References 19 publications

The strengthening mechanism of a nickel-based alloy after laser shock processing at high temperatures

The strengthening mechanism of a nickel-based alloy after laser shock processing at high temperatures

Understanding the Relations between Surface Stress State and Microstructure Feature for Enhancing the Fatigue Performance of TC6 Titanium Alloy

Surface Nanocrystallization and Amorphization of Dual-Phase TC11 Titanium Alloys under Laser Induced Ultrahigh Strain-Rate Plastic Deformation

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