Compound technology of manufacturing and multiple laser peening on microstructure and fatigue life of dual-phase spring steel

Prabhakaran, S.; Kalainathan, S.

doi:10.1016/j.msea.2016.08.031

Cited by 49 publications

(41 citation statements)

References 46 publications

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“…Along the cross-sectional direction, it can be seen that the highest hardness of the target material is not on the surface but on the subsurface. Without the protective coating, the direct laser irradiation on the surface of specimen may induce the softening of the material on the surface [24,35]. For all LPwC-treated samples, the maximum micro-hardness appears at the depth of 20 μm, which is a consequence of the softening due to the thermal effects on the sample surface and the similar results at the surface can be seen from the open literature [19,26].…”

Section: Vickers Micro-hardness Test Analysissupporting

confidence: 67%

Enhanced high cycle fatigue resistance of Ti-17 titanium alloy after multiple laser peening without coating

Jiao

Shen

2019

Int J Adv Manuf Technol

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High cycle fatigue failure of titanium alloy components on the aircraft is a serious problem that affects the flight safety. The low energy laser peening without coating (LPwC) has been demonstrated for the improved fatigue resistance of metallic materials via the introduction of compressive residual stress and microstructure modifications. Therefore, in the present study, LPwC with different impacts were conducted on the Ti-17 titanium alloy using the Mianna-Q laser with the wavelength of 532 nm and energy of 85 mJ. The surface and depth-wise residual stress and micro-hardness distributions were presented on the samples with and without LPwC treatment. High amplitude compressive residual stress was introduced, and the hardness was significantly improved. The microstructures of the Ti-17 samples after LPwC was characterized using the X-ray diffraction (XRD), scanning electron microscope (SEM) and transmission electron microscope (TEM). Furthermore, high cycle fatigue performance of the ascast, LPwCed sample with 1 impact and LPwCed sample with 3 impacts was evaluated via the tension-compression fatigue test. The fatigue strength of the LPwCed specimen was increased from 390 to 475.4 MPa (1 impact) and 490.3 MPa (3 impacts). Then, the fracture morphology of all the specimens were characterized by the SEM. Finally, the strengthening mechanism was discussed based on the microstructural evolution and residual stress distribution. It was concluded that the enhancement of high cycle fatigue strength was attributed to the combined effects of LPwC-induced compressive residual stress and high-density dislocations.

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Section: Vickers Micro-hardness Test Analysissupporting

confidence: 67%

Enhanced high cycle fatigue resistance of Ti-17 titanium alloy after multiple laser peening without coating

Jiao

Shen

2019

Int J Adv Manuf Technol

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“…The value of K I at the crack tip for the rectangular specimen without notch is calculated by Eqs. (6) and (7) [31]. …”

Section: Notch Effectmentioning

confidence: 99%

“…A large number of studies suggested that the fatigue strength of a material is proportional to its tensile strength and the fatigue crack that results in final failure usually initiates at the surface of the material [1][2][3]. In order to upgrade the fatigue strength of engineering materials/components, investigators have used surface strengthening techniques in the applications of aviation, automobile and high-speed railway [4][5][6][7][8][9]. The methods of surface treatment, such as shot peening, nitriding and surface induction, produce a strengthened surface layer which always possesses a gradient feature of microstructure and mechanical behavior including residual stress from the surface to the interior of treated specimens or components.…”

Section: Introductionmentioning

confidence: 99%

Fatigue crack growth behavior in gradient microstructure of hardened surface layer for an axle steel

Zhang

Xie

Jiang

et al. 2017

Materials Science and Engineering: A

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A B S T R A C TThis paper experimentally investigated the behavior of fatigue crack growth of an axle steel with a surface strengthened gradient microstructure layer. First, the microstructure, residual stress and mechanical properties were examined as a function of depth from surface. Then the fatigue crack growth rate was measured via three point bending fatigue testing. The results indicated that fatigue crack growth rate decelerated first and then accelerated with the increase of crack length within the gradient layer. Especially, the fatigue crack was arrested in the gradient layer under relatively low stress amplitude due to the increase of threshold value for crack growth within the range of 3 mm from surface. Based on these results, the parameters of Paris equation and the threshold value of stress intensity factor range within the gradient layer were determined and a curved surface was constructed to correlate crack growth rate with stress intensity factor range and the depth from surface. The effects of microstructure, residual stress and surface notch on the crack growth behavior were also discussed.

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“…Unlike the conventional LSP, LPwC is a process that employs low laser energy (<1 J) without any protective coatings, which can reduce the installation and operating costs and make it more viable for mass production [15][16][17]. Thus, a number of studies about the application of LPwC on the metallic materials have been conducted, such as stainless steel [18][19][20][21][22][23][24], aluminum alloys [25][26][27][28][29] as well as titanium alloys [30][31][32][33][34][35] in the past two decades. Maawad et al [33] comparatively investigated the effect of LPwC, shot peening and ball-burnishing on the residual stress state as well as fatigue performance of three titanium alloys, namely Ti-2.5Cu, Ti-54M and LCB.…”

Section: Introductionmentioning

confidence: 99%

“…Along in the direction of the in-depth, it can be found that the highest hardness appeared in the 219 subsurface layer, which was 20 μm away from the surface. Without the protective coating, the LPwC 220 may induce the softening of the material on the surface [21,42]. That is why the highest hardness was 221 in the subsurface but not on the surface.…”

mentioning

confidence: 99%

Investigations into the Improvement of the Mechanical Properties of Ti-5Al-4Mo-4Cr-2Sn-2Zr Titanium Alloy by Using Low Energy Laser Peening without Coating

Xue

Jiao

et al. 2020

Materials

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Mechanical properties, such as residual stress, micro-hardness and fatigue performance, of the Ti-5Al-4Mo-4Cr-2Sn-2Zr titanium alloy were improved via the laser peening without coating (LPwC) with a water-penetrable wavelength of 532 nm and pulse duration of 10 ns. In this paper, three kinds of laser energy, namely 85, 110 and 160 mJ were used to process the samples. The titanium alloy samples were also peened with different impact times (1, 3 or 5 impacts) at the energy of 85 mJ. The micro-hardness and residual stress distribution results provided that LPwC can introduce compressive residual stress (CRS) and also induce hardening of the target materials. Further, micro-hardness and CRS showed the increasing trends when the laser impact times increased. However, the CRS and micro-hardness decreased while the laser energy increased from 110 to 160 mJ, which was attributed to the dynamic equilibrium between the thermal and mechanical effects of LPwC. High cycle fatigue strength of the titanium alloy was significantly improved from 360 to 490.3 MPa after three impacts LPwC. The strengthening mechanism of fatigue strength subjected to LPwC was a combined effect between the laser-induced CRS and the high-density dislocations. 101The LPwC experiment was conducted by a Q-switched Nd:YAG laser with a water-penetrable 102 wavelength of 532 nm (Mianna Q series) which operates at 3 Hz and it can supply an maximum pulse 103 energy of 0.8 J. The full duration half maximum (FWHM) of the laser is 10 ns and it can generate the 104 pulsed laser with the spot size of 400 μm. Multiple pulses (1, 3, 5) and a range of laser energies (85 105 mJ, 110 mJ, 160 mJ) were used, and the effect of the variation of these parameters on the mechanical 106 properties change has been investigated. The detailed laser parameters are shown in Table 2. During 107 the laser processing, the specimens were immersed in the water tank, in which the distance between 108 the surface of the specimen and water surface is about 1-2 mm. In addition, the specimen was fixed 109 on the X-Y two axis translation platform and move in a zigzag scan type (as shown in Figure 1). It 110 can be seen from Figure 3 (Schematic diagram of LPwC experimental setup) that the operation of the 111 platform and the laser were controlled by the PC via a self-programmed software.101 The LPwC experiment was conducted by a Q-switched Nd:YAG laser with a water-penetrable 102 wavelength of 532 nm (Mianna Q series) which operates at 3 Hz and it can supply an maximum pulse 103 energy of 0.8 J. The full duration half maximum (FWHM) of the laser is 10 ns and it can generate the 104 pulsed laser with the spot size of 400 μm. Multiple pulses (1, 3, 5) and a range of laser energies (85 105 mJ, 110 mJ, 160 mJ) were used, and the effect of the variation of these parameters on the mechanical 106 properties change has been investigated. The detailed laser parameters are shown in Table 2. During 107 the laser processing, the specimens were immersed in the water tank, in which the distance between 108...

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Compound technology of manufacturing and multiple laser peening on microstructure and fatigue life of dual-phase spring steel

Cited by 49 publications

References 46 publications

Enhanced high cycle fatigue resistance of Ti-17 titanium alloy after multiple laser peening without coating

Enhanced high cycle fatigue resistance of Ti-17 titanium alloy after multiple laser peening without coating

Fatigue crack growth behavior in gradient microstructure of hardened surface layer for an axle steel

Investigations into the Improvement of the Mechanical Properties of Ti-5Al-4Mo-4Cr-2Sn-2Zr Titanium Alloy by Using Low Energy Laser Peening without Coating

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