Effects of laser shock processing on microstructure and mechanical properties of K403 nickel-alloy

Wang, C.; Shen, Xiaojun; An, Zhibin; Zhou, Lian; Chai, Yuan

doi:10.1016/j.matdes.2015.10.022

Cited by 55 publications

(16 citation statements)

References 24 publications

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“…The diffraction peak will move to the right when Bragg diffraction occurs, and the magnitude of the movement is related to the stress. Similar results were presented in different works using LSP [ 7 , 18 ]. According to Jade 6, the FWHM of diffraction peak (111) increased from 0.139 to 0.252 radian.…”

Section: Resultssupporting

confidence: 89%

Improvement of Fatigue Life of GH3039 Superalloy by Laser Shock Peening

Tang

Zhang

et al. 2020

Materials

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In order to improve fatigue life of GH3039 superalloy, GH3039 superalloy sheets were treated by laser shock peening (LSP). The microstructure of GH3039 superalloy before and after LSP was characterized using an optical microscope, transmission electron microscope (TEM), and X-ray diffractometer. The fatigue life of the samples with and without LSP was investigated by fatigue experiments. Moreover, surface profile and residual stress were also examined. Experimental results indicated that the grains in the surface layer of the LSP sample were remarkably refined and reached the nanometer scale. The average surface roughness increased from 0.024 μm to 0.19 μm after LSP. The average fatigue life of the laser treated samples was 2.01 times larger than that of the untreated specimens. Additionally, mathematical statistical analysis confirms that LSP has a significant influence on the fatigue life of GH3039 superalloy. The improvement of fatigue life for the laser processed GH3039 superalloy was mainly attributed to compressive residual stress and grain refinement generated by LSP.

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Section: Resultssupporting

confidence: 89%

Improvement of Fatigue Life of GH3039 Superalloy by Laser Shock Peening

Tang

Zhang

et al. 2020

Materials

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“…Actually, under the interaction of the residual stress and CCF load, the maximum stress is in the matrix near the top surface. The micro-cracks initiate from the bulk carbides inside the matrix, propagate along the grain boundaries and finally develop into visible cracks [20,[26][27]. The SEM morphology and EDS analyze results of the PSP treated blades at the fracture location are shown in Figure 13.…”

Section: Micro-cracks and Fracturementioning

confidence: 99%

“…Large number of researches about the effect of PSP on the fatigue life of the metal are carried out [11][12][13][14][15][16][17][18][19][20][21][22][23]. Gao et al [11] investigate the effect of PSP on the small crack growth rate and fatigue life of 7475-T7351 aluminum alloy.…”

mentioning

confidence: 99%

Effect of pneumatic shot peening on the high and low cycle combined fatigue life of K403 turbine blades

Ding¹,

Huang²,

Yan³

et al. 2020

Preprint

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The effect of pneumatic shot peening (PSP) on the fatigue properties of K403 turbine blades has been investigated under the high and low cycle combined fatigue (CCF) load with two types of blades: untreated blades and PSP treated blades. It is found that there is a threshold vibration stress which should be 194MPa. The PSP has a positive effect on the CCF life of blades mainly due to the compressive residual stress resulting in the reduction of the number of crack sources and propagation rate when vibration stresses are below the threshold vibration stress. However, the PSP treatment has no or negative effect when vibration stresses are above the threshold value. The compressive residual stress is released along with the microstructure changes of K403. Meanwhile, the microstructure changes, reflected in the precipitation of the lamellar MC carbides and σ phases, can accelerate the process of crack initiation and propagation.

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“…Therefore, many researchers have focused on mechanical properties, microstructure and fatigue life of the surface layer of nickel alloys induced by various methods such as mechanical shot peening (Ref 14,15). However, there have been a limited number of studies carried out to understand the influence of LSP process on microstructure and properties of nickel alloys (Ref [16][17][18]. For example, Li et al (Ref 16) studied the aero-engine turbine blade nickel K417 alloy and observed the microstructural change on the surface of the nickel-based alloy after LSP treatment.…”

Section: Introductionmentioning

confidence: 99%

Effect of Laser Shock Peening on the Microstructure and Properties of the Inconel 625 Surface Layer

Rozmus-Górnikowska

Kusiński

Cieniek

2020

J. of Materi Eng and Perform

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The aim of this work was to investigate the influence of laser shock peening on the topography, microstructure, surface roughness and the mechanical properties of the Inconel 625 nickel alloy. Examination of the topography and microstructure of the nickel alloy after laser treatment was carried out by means of scanning electron microscopy as well as atomic force microscopy. The roughness of the surface was measured by WYKO NT9300 equipment. Nanohardness test was carried out using a nanoindenter NHT 50-183 of CSM Instruments equipped with a Berkovich diamond indenter. Additionally, transmission electron microscopy was used to examine the microstructural changes on the surface layer after laser treatment. The investigations showed that the laser process produced an ablation and melting of the surface layer and, hence, increased the surface roughness of the Inconel 625. On the other hand, the presence of the slip bands on the surface and on the cross section of the treated material, a high density of dislocations and a higher hardness of the treated region indicated that the laser shock processing caused severe plastic deformation of the surface layer. Additionally, due to the high plastic deformation, cracking of the carbide precipitates was observed.

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Effects of laser shock processing on microstructure and mechanical properties of K403 nickel-alloy

Cited by 55 publications

References 24 publications

Improvement of Fatigue Life of GH3039 Superalloy by Laser Shock Peening

Improvement of Fatigue Life of GH3039 Superalloy by Laser Shock Peening

Effect of pneumatic shot peening on the high and low cycle combined fatigue life of K403 turbine blades

Effect of Laser Shock Peening on the Microstructure and Properties of the Inconel 625 Surface Layer

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