Effects of Machining Induced Residual Shear and Normal Stresses on Fatigue Life and Stress Intensity Factor of Inconel 718

Hua, Yang; Wang, Qingqing

doi:10.3390/app9224750

Cited by 7 publications

(5 citation statements)

References 32 publications

(84 reference statements)

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“…The presence of residual shear stresses agrees to literature [8,20,22,24,25]. The XRD measurement of residual shear stresses used to be more complicated than the measurement of residual normal stresses, whereas the former may involve different instrumental configurations, multi-axial measurement and massive data processing [11,12,20,[22][23][24]. Comparing to those methods reported in the literature, the new (d ψ -d -ψ ) ~ sin(2ψ) method is straightforward for it is developed from the mostly used d ~ sin 2 ψ method, which therefore can be undertaken under the same instrumental configuration.…”

Section: Residual Shear Stresses Determined By the New Methodssupporting

confidence: 90%

“…The samples having large residual shear stresses show remarkable sin 2 ψ splitting, whereas those having low shear stresses show marginal sin 2 ψ splitting. The presence of residual shear stresses agrees to literature [8,20,22,24,25]. The XRD measurement of residual shear stresses used to be more complicated than the measurement of residual normal stresses, whereas the former may involve different instrumental configurations, multi-axial measurement and massive data processing [11,12,20,[22][23][24].…”

Section: Residual Shear Stresses Determined By the New Methodssupporting

confidence: 83%

“…In addition, the deformation and friction also induce rapid heating and subsequent cooling of the machined surface in certain depth, which also contributes to the residual stresses. Residual stresses resulting from grinding, turning, and milling have been studied extensively [8,[11][12][13][14][15][16][17][18][19][20][21][22][23][24][25]. For example, Xin and Zhang reported residual tensile stresses of high strength steels after turning or high speed milling [13,14].…”

Section: Introductionmentioning

confidence: 99%

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A modified X-ray diffraction method to measure residual normal and shear stresses of machined surfaces

Luo

2022

Int J Adv Manuf Technol

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X-ray diffraction has been widely used in measuring surface residual stresses. A drawback of the conventional d ~ sin2ψ method is the increased uncertainty arising from sin2ψ splitting when a significant residual shear stress co-exists with a residual normal stress. In particular, the conventional method can only be applied to measure the residual normal stress while leaving the residual shear stress unknown. In this paper, we propose a new approach to make simultaneous measurement of both residual normal and shear stresses. Theoretical development of the new approach is described in detail, which includes two linear regressions, $$\frac{{d}_{\psi }+ {d}_{-\psi }}{2}$$ d ψ + d - ψ 2 ~sin2ψ and {dψ-d-ψ} ~ sin(2ψ), to determine the residual normal and shear stresses separately. Several samples were employed to demonstrate the new method, including turning-machined and grinding-machined cylindrical bars of a high strength steel as well as a flat sample of magnetron sputtered TiN coating. The machined samples were determined to have residual compressive normal stresses at both the axial and hoop directions as well as various scales of residual shear stresses. The TiN coating showed a high scale of residual compressive (normal) stress whereas the measured residual shear stress was extremely low. The new method showed significantly increased precision as compared to the conventional d ~ sin2ψ method.

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Section: Residual Shear Stresses Determined By the New Methodssupporting

confidence: 90%

Section: Residual Shear Stresses Determined By the New Methodssupporting

confidence: 83%

Section: Introductionmentioning

confidence: 99%

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A modified X-ray diffraction method to measure residual normal and shear stresses of machined surfaces

Luo

2022

Int J Adv Manuf Technol

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“…Residual stresses were measured by using X-ray diffraction (XRD) with the cosα method [ 27 ]. A μ -X360n XRD system (Pulstec, Hamamatsu, Japan) with Cr-Kβ radiation line was employed to measure residual stress at the crystal plane {311} of Inconel 718.…”

Section: Methodsmentioning

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

Self Cite

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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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“…21 Thus, the minimizing Ra, SRS 2200 MPa and maximizing FWHM were the targets and signed as Rat, SRSt, FWHMt. Combining with the weights w a for Ra, w s for SRS, and w h for FWHM, the comprehensive evaluation of surface integrity (CESI) can be modeled in the formula (3).…”

Section: Evaluation Modeling and Experimentsmentioning

confidence: 99%

The comprehensive improvement of surface integrity in whirlwind milling a large screw

Guo

Wang

Xie

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part B:

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The surface integrity of a large screw in whirlwind milling was vital for the fatigue life. Firstly, the comprehensive evaluation of surface integrity (CESI) was modeled by the Analytic Hierarchy Process (AHP). The weights of selected important factors, such as surface roughness (Ra), surface residue stress (SRS), and full width at half maximum (FWHM), were calculated. Then aimed at minimizing Ra, SRS −200 MPa and maximizing FWHM, the single-factor improvements were achieved under different parameter combination, respectively. Lastly based on single-factor improvements, the CESI was markedly improved by 64% compared to factory processing. Thus, the proposed approach and methodology can be notably adequate for evaluating and improving the surface integrity comprehensively.

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Effects of Machining Induced Residual Shear and Normal Stresses on Fatigue Life and Stress Intensity Factor of Inconel 718

Cited by 7 publications

References 32 publications

A modified X-ray diffraction method to measure residual normal and shear stresses of machined surfaces

A modified X-ray diffraction method to measure residual normal and shear stresses of machined surfaces

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

The comprehensive improvement of surface integrity in whirlwind milling a large screw

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