Thermal relaxation of residual stress in laser shock peened Ti–6Al–4V alloy

Zhou, Zhong; Bhamare, Sagar; Ramakrishnan, Gokul; Mannava, Seetha R.; Langer, Kristina; Wen, Youhai; Qian, Dong; Vasudevan, Vijay K.

doi:10.1016/j.surfcoat.2012.05.022

Cited by 85 publications

(49 citation statements)

References 41 publications

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“…Nevertheless, the strength enhancing efficiency was not noteworthy when the strengthened material was serviced at medium or high temperature. The relaxation of residual stress can be deemed as one of the main contributors to the little improvement of service properties [24,25]. Besides this, there is also more important factor causing the inapparent strength enhancing efficiency.…”

Section: The Invariable Yield Strength Brought By Laser Shockmentioning

confidence: 99%

Effect of laser shock on tensile deformation behavior of a single crystal nickel-base superalloy

Liu

Qiao

et al. 2017

Materials Science and Engineering: A

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Section: The Invariable Yield Strength Brought By Laser Shockmentioning

confidence: 99%

Effect of laser shock on tensile deformation behavior of a single crystal nickel-base superalloy

Liu

Qiao

et al. 2017

Materials Science and Engineering: A

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“…The results showed that LP is an effective surface treatment technique that can induce beneficial compressive residual stress and microstructures, such as a high density of dislocation, mechanical twins, and refined grains, which eventually retards fatigue crack growth. However, LP-induced beneficial effects on fatigue properties have shown to be released at high temperature and cycle loading, consequently limiting its application [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Residual Stress Distribution and Microstructure Evolution of AA 6061-T6 Treated by Warm Laser Peening

Huang

Wang

Sheng

et al. 2016

Metals

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Abstract:The aim of this paper is to study the effects of laser peening (LP) on the residual stress distribution and microstructure evolution of AA 6061-T6 under different temperatures. A laser peening experiment was conducted on the square-shape samples by using single spot and 50% overlap shock. Three-dimensional surface morphologies of treated samples were observed. The influence of peening temperature on the distribution of compressive residual stress was analyzed. An optical microscope (OM) and a transmission electron microscope (TEM) were employed to observe the microstructure evolution of the samples before and after LP. The results indicate that, as the peening temperature increases, the micro-hardness increases first and then decreases. The LP process induces high-amplitude compressive residual stress on the surface at different temperatures even if the compressive residual stress slightly reduces with increases in temperature. The maximum compressive residual stress affected layer depth is about 0.67 mm, appearing at a temperature of 160 • C. The OM test revealed that the grain size was significantly decreased after warm laser peening (WLP) and that the average value of grain size was reduced by 50%. The TEM test shows that more dislocation tangles were produced in AA 6061-T6 after WLP; compared to the LP process, the precipitate-dislocation interaction can benefit both strength and ductility for AA 6061-T6, thus enhancing the mechanical properties of the material.

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“…The calibrated JC model parameters for K417 [16,19] in this simulation are thus given in Table 3. Since the geometry model is symmetrical in space, a quarter of the entire model was studied in this paper.…”

Section: Lsp and Model Determinationmentioning

confidence: 99%

“…The purely thermal loading condition is simulated by a convection boundary [15,16], where q is heat flux across the boundary, h is heat transfer coefficient of air, which is 110 W/(m 2°C ) for natural convection in this simulation, T is the initial temperature of the specimen, which is taken to be ambient temperature, and T ∞ is the imposed heating temperature.…”

Section: Lsp and Model Determinationmentioning

confidence: 99%

“…Ren et al [14] found that the lower residual stress relaxation of LSP 6061-T651 aluminum alloy in the temperature range 25-600°C is induced by the pinning effect of precipitations on dislocation movement. Zhou et al [15,16] investigated the effect of exposure time and temperature on the stress relaxation in LSP IN718 and Ti-6Al-4V. They found that residual stress released mainly during the initial period of exposure and the relaxation magnitude increased with the increase of applied temperature.…”

Section: Introductionmentioning

confidence: 99%

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Laser shock processing on Ni-based superalloy K417 and its effect on thermal relaxation of residual stress

Zhou

Ren

et al. 2016

Int J Adv Manuf Technol

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The compressive residual stress fields at ambient temperature and stress relaxation at elevated temperatures of nickel-based alloy K417 by laser shock processing (LSP) were investigated by the finite element analysis and experimental method. A temperature and strain rate-dependent plasticity model of Johnson-Cook (JC) material model was utilized to investigate the residual stress evolution under LSP and thermal loads. The residual stress distributions of original and processed specimens were measured by the X-ray diffraction method. Zener-Wert-Avrami function was employed to study the thermal relaxation process of LSP K417, and the simulated results have a significant agreement with the experimental data. Specifically, most of stress relaxation occurs before 30 min of exposure, and the relaxation amplitude increases with the rise of applied temperature. The activation enthalpy of the relaxation process for LSP K417 obtained from simulation and experiment are determined to be 2.86 and 2.85 eV respectively.

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Thermal relaxation of residual stress in laser shock peened Ti–6Al–4V alloy

Cited by 85 publications

References 41 publications

Effect of laser shock on tensile deformation behavior of a single crystal nickel-base superalloy

Effect of laser shock on tensile deformation behavior of a single crystal nickel-base superalloy

Residual Stress Distribution and Microstructure Evolution of AA 6061-T6 Treated by Warm Laser Peening

Laser shock processing on Ni-based superalloy K417 and its effect on thermal relaxation of residual stress

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