Laser processing of inconel 600 and surface structure

Bugayev, A.; Gupta, Mool C.; Payne, R. D.

doi:10.1016/j.optlaseng.2005.04.014

Cited by 31 publications

(14 citation statements)

References 15 publications

(18 reference statements)

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“…Recent LSP studies have shown that laser peening technique can be used for shaping and forming of metals [47] and inspection of coatings [80] as discussed in Section 4. The materials laser peened include titanium alloys [11,13,53,54,55,65,66,71,72,82,83,84,85,86,87,88,89,90], aluminum alloys [3,5,60,61,62,64,75,76,90,91,92,93,94,95,96,97,98,99,100,101,102,103,104], different steel grades [8,66,69,70,79,97,105,106,107,108,109,110,111,112,113,114,115,116,117,118,…”

Section: Laser Shock Peeningmentioning

confidence: 99%

Laser Peening Process and Its Impact on Materials Properties in Comparison with Shot Peening and Ultrasonic Impact Peening

2014

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The laser shock peening (LSP) process using a Q-switched pulsed laser beam for surface modification has been reviewed. The development of the LSP technique and its numerous advantages over the conventional shot peening (SP) such as better surface finish, higher depths of residual stress and uniform distribution of intensity were discussed. Similar comparison with ultrasonic impact peening (UIP)/ultrasonic shot peening (USP) was incorporated, when possible. The generation of shock waves, processing parameters, and characterization of LSP treated specimens were described. Special attention was given to the influence of LSP process parameters on residual stress profiles, material properties and structures. Based on the studies so far, more fundamental understanding is still needed when selecting optimized LSP processing parameters and substrate conditions. A summary of the parametric studies of LSP on different materials has been presented. Furthermore, enhancements in the surface micro and nanohardness, elastic modulus, tensile yield strength and refinement of microstructure which translates to increased fatigue life, fretting fatigue life, stress corrosion cracking (SCC) and corrosion resistance were addressed. However, research gaps related to the inconsistencies in the literature were identified. Current status, developments and challenges of the LSP technique were discussed.

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Section: Laser Shock Peeningmentioning

confidence: 99%

Laser Peening Process and Its Impact on Materials Properties in Comparison with Shot Peening and Ultrasonic Impact Peening

2014

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“…The {422}-interference lines of the aluminum phase were determined at 11 c-angles from À508 to þ508 using CuKa-radiation and analyzed by the sin 2 c method [16] Assuming plane stress conditions, the resulted residual stress can be evaluated as the sum of the principal stresses in the surface. [17] The X-ray peak broadenings were evaluated by the full width at half maximum (FWHM) integral values after removal of the K a2 signal. [18] The FWHM value at a 908 X-ray incidence angle of the Bragg diffraction peaks were used as a measure of the relative dislocation density, or work hardening.…”

Section: Residual Stress Measurementsmentioning

confidence: 99%

Warm Laser Shock Peening Driven Nanostructures and Their Effects on Fatigue Performance in Aluminum Alloy 6160

Liao

Cheng

2010

Adv Eng Mater

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Warm laser shock peening is an innovative manufacturing process that integrates laser shock peening and dynamic aging to improve materials' fatigue performance. Compared to traditional laser shock peening (LSP), warm laser shock peening (WLSP) – i.e., LSP at elevated temperatures – provides better performance in many aspects. WLSP can induce nanoscale precipitation and high density dislocation arrangement, resulting in higher surface strength and lower surface roughness than LSP, which are both beneficial for fatigue life improvement. Due to pinning of the dislocation structure by nanoscale precipitates – so‐called dislocation pinning effects – the relaxation of residual stress and surfaces dislocation arrangement is significantly reduced. In this study, AA6061 alloy is used to evaluate the WLSP process. It is found that the fatigue life improvements after WLSP are not only caused by large compressive residual stress and high density dislocations but also by the higher stability of the residual stresses and surface strength during cyclic loading.

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“…No melting was reported on the surface. Bugayev et al (2006) studied the surface morphology of IN600 coupons peened with a Nd:YAG laser using water as confinement mode. A patch was created with 80% overlap on polished IN600 coupons.…”

Section: Introductionmentioning

confidence: 99%

Characteristics of surface layers formed on inconel 718 by laser shock peening with and without a protective coating

Gill¹,

Telang²,

Vasudevan³

2015

Journal of Materials Processing Technology

123

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a b s t r a c tCoupons of a Ni base super alloy, Inconel alloy 718 (IN718) were laser shock peened with and without an ablative layer and resulting microstructure and residual stress state were studied. Laser shock peening without a protective overlay results in both mechanical and thermal loading of the material, leading to melting and re-solidification on the surface along with deformation due to laser induced shock wave. The surface shows presence of a non-uniform recast layer which increases the roughness of the surface and also results in a tensile state of residual stresses on surface. The recast layer has areas with modified chemistry and shows presence of nano particles deposited on top of the matrix. In this study, recast layer formed in Inconel alloy 718 (IN718) as a result of laser shock peening without protective overlay was characterized and compared with surface condition of a sample peened with a protective overlay. These results are presented and discussed in relation with those of previous studies.

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Laser processing of inconel 600 and surface structure

Cited by 31 publications

References 15 publications

Laser Peening Process and Its Impact on Materials Properties in Comparison with Shot Peening and Ultrasonic Impact Peening

Laser Peening Process and Its Impact on Materials Properties in Comparison with Shot Peening and Ultrasonic Impact Peening

Warm Laser Shock Peening Driven Nanostructures and Their Effects on Fatigue Performance in Aluminum Alloy 6160

Characteristics of surface layers formed on inconel 718 by laser shock peening with and without a protective coating

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