Effect of Shot Peening on Residual Stress and Microstructure in the Deformed Layer of Inconel 625

Wu, Lihui; Jiang, Chuanhai

doi:10.2320/matertrans.m2016298

Cited by 14 publications

(3 citation statements)

References 14 publications

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“…The compressive residual stress (CRS) of the deformed layer caused by shot peening is a key factor to improve the fatigue performance of materials by delaying the initiation and propagation of fatigue cracks [7]. And the distribution features of residual stress change with peening parameters, influencing the effect of strengthening on fatigue life [8-10]. The stress presents a non-uniform distribution profile along with the depth in the deformed layer, and the maximum compressive residual stress (MCRS) generally appears on the subsurface.…”

Section: Introductionmentioning

confidence: 99%

Analysis of shot peening residual stress distribution based on dislocation configuration

Zhang

Huang

Niu

et al. 2022

Materials Science and Technology

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The distribution profile of residual stress on the surface layer of shot-peened materials is often in a hook shape. We analysed the distribution characteristics of residual stress by detecting dislocation configurations. The position of maximum compressive residual stress (MCRS) shifts inward with an increase in shot peening strength. It was found that long-term orderly dislocation pile-up groups frequently appeared in the MCRS region. The location of MCRS is not necessarily related to maximum dislocation density. At low strength, both the maximum dislocation density and the MCRS are on the surface region. At high strength, the surface region structures are composed of sub-grains and dislocation cells. The position of maximum dislocation density is between the surface region and the MCRS.

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Section: Introductionmentioning

confidence: 99%

Analysis of shot peening residual stress distribution based on dislocation configuration

Zhang

Huang

Niu

et al. 2022

Materials Science and Technology

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“…Inconel 718 is mostly used in gas turbine industries [15][16][17], compressor and turbine disks, blades, tubes, shafts, and fasteners due to its ability to be used in wrought or cast forms, high strength, weldability and fabricability [18,19]. Inconel 625 has been well known and widely used in different industries such as: chemistry, aerospace, nuclear power and others, thanks to its superior thermal, creep properties and fatigue [20,21].…”

Section: Introductionmentioning

confidence: 99%

The Analysis of the Residual Stress Evolution during Cycling Oxidation of the Ni-base Superalloys at High Temperature

et al. 2021

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The lifetime of the elements made of Ni-base superalloys can be strongly increased by introducing compressive stresses. Such stresses increase the resistance of cracks nucleation and formation during cyclic loads. Therefore, it is important to know how the stresses in the cold rolled Ni-based superalloys evolve during the service. Ni-base superalloys are dedicated to the usage at elevated temperature. However, exposing the Ni-based superalloys to high temperature results in their oxidation. So far, not a single work on the studies of the residual stress evolution in the Ni-based superalloys during cycling oxidation at high temperature was performed. Thus in the present study the residual stress in the materials in the as-received conditions and the changes in the residual stresses during cycling oxidation of IN 625 and IN 718 at 1273 K in air was investigated and described. The obtained results showed differences in the residual stresses level measured for investigated alloys. It was also found that thermal cycling of studied alloys influences the residual stresses. However even after the end of the test, the measured residual stresses were still compressive. Slightly different oxidation resistance was found for the studied alloys, namely, IN 718 was found to be more prone to oxide scale spallation. The latter was correlated with different alloy chemical composition, which results in formation of δ -phase in IN 718. The dissolution of δ -phase during high temperature exposure resulted in formation of sub-scale enriched with Nb and Ti in the near oxide scale/substrate interface. The latter was claimed to have a negative effect on oxide scale adherence.

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“…The high level of compressive residual stress and the finer microstructure can improve the mechanical properties of the material. [2][3][4][5][6][7] However, residual stress and microstructure can be relaxed at elevated temperatures. Fatigue strength and yield strength can also be decreased largely.…”

Section: Introductionmentioning

confidence: 99%

Effect of thermal relaxation on residual stress and microstructure in the near-surface layers of dual shot peened Inconel 625

Jiang

2018

Advances in Mechanical Engineering

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Thermal relaxation behavior of residual stress and microstructure in the near-surface layers of dual shot peened Inconel alloy 625 was investigated by X-ray diffraction method. Residual stress on the top surface layer was significantly relaxed in the first 15 min at the elevated temperatures of 500°C, 600°C, and 700°C. However, there was still high maximum compressive residual stress in subsurface layers. The relaxation behavior of residual stress has contributed to the thermally activated process. The activation enthalpy Δ H and m were calculated according to the Zener–Wert–Avrami method, the values of which were 1.59 eV and 0.4934, respectively. Microstructural evaluation revealed that it was slightly changed in the near-surface layers after various isothermal treatments. Accordingly, high level of compressive residual stress and dislocation density resulted in the retained mechanical properties of dual shot peened Inconel 625, which was discussed based on the relaxation of microstructure and microhardness.

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Effect of Shot Peening on Residual Stress and Microstructure in the Deformed Layer of Inconel 625

Cited by 14 publications

References 14 publications

Analysis of shot peening residual stress distribution based on dislocation configuration

Analysis of shot peening residual stress distribution based on dislocation configuration

The Analysis of the Residual Stress Evolution during Cycling Oxidation of the Ni-base Superalloys at High Temperature

Effect of thermal relaxation on residual stress and microstructure in the near-surface layers of dual shot peened Inconel 625

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