Evolution of microstructure and grain refinement mechanism of pure nickel induced by laser shock peening

Chen, Lan; Ren, Xudong; Zhou, Wangfan; Tong, Zhaopeng; Adu-Gyamfi, Samuel; Ye, Yunxia; Ren, Yunpeng

doi:10.1016/j.msea.2018.04.105

Cited by 68 publications

(8 citation statements)

References 52 publications

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“…6 c), with uneven distribution. It is mentioned in the literature 32 , 33 that such dislocation tangles could transform into subgrain boundaries, and during the course, the original coarse grains are separated into subgrains. Compared with the untreated LC region (Fig.…”

Section: Resultsmentioning

confidence: 99%

Effect of laser shock peening on microstructure and mechanical properties of laser cladding 30CrMnSiNi2A high-strength steel

Wang

Xing

et al. 2023

Sci Rep

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The effect of laser shock peening (LSP) on the microhardness and tensile properties of laser cladding (LC) 30CrMnSiNi2A high-strength steel was studied. After LSP, the microhardness of the cladding zone reached approximately 800 HV0.2, which was 25% higher than that of the substrate, while the cladding zone without LSP had an approximately 18% increase in its microhardness. Two strengthening processes were designed: groove LSP + LC + surface LSP versus LC + surface LSP. The former's tensile strength and yield strength were less than 10% weaker than those of forged materials, which is the best mechanical property recovery found in LC samples. The microstructural characteristics of the LC samples were analysed by scanning electron microscopy (SEM) and electron backscatter diffraction. Under the action of the laser-induced shock wave, the grain size of the LC sample surface was refined, the low-angle grain boundaries on the surface layer increased significantly, and the austenite grain length was reduced from 30–40 μm in the deep layer to 4–8 μm in the surface layer. In addition, LSP modulated the residual stress field, hence preventing the weakening effect of the LC process's thermal stress on the components' mechanical properties.

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Section: Resultsmentioning

confidence: 99%

Effect of laser shock peening on microstructure and mechanical properties of laser cladding 30CrMnSiNi2A high-strength steel

Wang

Xing

et al. 2023

Sci Rep

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“…Chamanfar et al [ 32 ] reported that the plastic deformation generated by SP would rotate the grain along the slip system, hence leading to the formation of HAGBs. Chen et al [ 33 ] also proposed that the mutual rotation of grains and the grain boundaries slip induced the HAGBs. There are two main ways for the formation of HAGBs.…”

Section: Resultsmentioning

confidence: 99%

Studies on the Microstructural Evolution and Mechanical Properties of Superalloy Inconel 718 Induced by Low Plasticity Burnishing Coupled with Turning

Hua

Liu

et al. 2022

Materials

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Mechanical surface treatments are needed to perform on components for fatigue life enhancement by introducing beneficial compressive residual stress and material strengthening. In this study, the combined turning with low plasticity burnishing (LPB) surface modification process was performed for the sake of improving mechanical properties of Inconel 718. Firstly, the evolution of microstructure and residual stress after the LPB process were analyzed with the aid of electron backscatter diffraction (EBSD) and X-ray diffraction (XRD), respectively. Secondly, the tensile behavior of treated samples was investigated through tension tests. Finally, the micro-strengthening mechanism of Inconel 718, induced by the LPB process, was revealed. The results show that the peak compressive stress is increased by a factor of 4.2 after the LPB process. The grain refinement induced by the LPB process is attributed to the increase of average misorientation and the formation of high angle grain boundaries (HAGBs). The enhanced yield strength depends on the decreased average spacing and the increased HAGBs.

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“…Under the conditions described in the experimental scheme design, based on the dislocation movement characteristics in the NV E690 cladding layer and the grain refinement process caused by this layer’s expansion and intersection, and by considering the research results of Lu and Ren on the grain refinement of an LY2 aluminum alloy and a nickel alloy by LSP [ 24 , 25 ], the grain refinement mechanism induced by the dislocation movement of the E690 high-strength steel cladding layer caused by LSP was established ( Figure 14 ). Each untreated E690 high-strength steel cladding layer was an equiaxed crystal, and the dislocations inside the grain were sparse and distributed discretely ( Figure 14 a).…”

Section: Results and Analysismentioning

confidence: 99%

Dislocation Mechanism and Grain Refinement of Surface Modification of NV E690 Cladding Layer Induced by Laser Shock Peening

et al. 2022

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To investigate the relationship between the dislocation configuration and the grain refinement in the NV E690 cladding layer caused by laser shock peening, NV E690 high-strength steel powder was used to repair prefabricated pits in samples of 690 high-strength steel by laser cladding, where the laser shock peening of the cladding layer was performed by laser shock at different power densities. X-ray diffraction, scanning electron microscopy, and transmission electron microscopy were used to observe the microstructures of these samples before and after the laser shock process. The results showed that the metallurgical bonding between the cladding layer and the substrate after laser cladding repair was good. When the laser power density was 4.77 GW/cm2, multiple edge dislocations, dislocation dipoles, and extended dislocations were distributed over the cladding layer. When the laser power density was 7.96 GW/cm2, a geometrically necessary dislocation divided the large original grain into two subgrains with different orientations. When the laser power density was 11.15 GW/cm2, geometric dislocations divided the entire large grain into fine grains. The grain refinement model of the NV E690 cladding layer, when treated by laser shock peening, can describe the grain refinement process induced by the dislocation movement of this cladding layer.

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Evolution of microstructure and grain refinement mechanism of pure nickel induced by laser shock peening

Cited by 68 publications

References 52 publications

Effect of laser shock peening on microstructure and mechanical properties of laser cladding 30CrMnSiNi2A high-strength steel

Effect of laser shock peening on microstructure and mechanical properties of laser cladding 30CrMnSiNi2A high-strength steel

Studies on the Microstructural Evolution and Mechanical Properties of Superalloy Inconel 718 Induced by Low Plasticity Burnishing Coupled with Turning

Dislocation Mechanism and Grain Refinement of Surface Modification of NV E690 Cladding Layer Induced by Laser Shock Peening

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