Residual Stress and Affected Layer in Disc Milling of Titanium Alloy

Xin, Hongmin; Shi, Yaoyao; Ning, Liqun; Zhao, Tao

doi:10.1080/10426914.2015.1090583

Cited by 21 publications

(5 citation statements)

References 22 publications

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“…Variation in the mechanical properties with grinding is closely related to the stress introduced by the typical mechanical grinding process. 31 Similarly, the thickening of the surface layer with grinding increases the surface hardness. 32 Besides, improved surface uniformity with IEP enhanced the surface mechanical properties of the as-extruded surface since the nanoindenter measures these values relative to the first contact with the target surface, and finishing improves the surface contact area by removing voids on the as-extruded rough surface.…”

Section: Resultsmentioning

confidence: 99%

Highly Efficient Inner Surface Polishing of Fe-Cr-Ni Alloy Cylinder via Isotropically Tuned Electrochemical Etching

Ajmal¹,

Zhan²,

Yi³

et al. 2022

J. Electrochem. Soc.

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The inner surface of a Fe-Cr-Ni alloy cylinder produced through extrusion is processed by electrochemical isotropic etching polishing (IEP). The electric field simulation predicted a high current density at protrusions, pertinent for passivation layer breakdown and proficient dissolution. Initially, the effect of cathode diameter and current density was investigated on planarization and current efficiencies, material removal rate, and etching behavior of IEP of ground Fe-Cr-Ni alloy. IEP of the as-extruded inner surface realized a 94% improvement in the Sa roughness (from 5.33 to 0.34 µm), while the initial surface morphology and instantaneously breaking metal lumps seriously influenced the final Sa roughness and polishing duration. Furthermore, the as-extruded and ground Fe-Cr-Ni alloy substrates were polished simultaneously, whereupon the IEP of the latter produced a mirror-like, highly uniform, and mechanically superior surface with 37% higher planarization efficiency and 19% greater wall thickness. However, due to falling off metal lumps, the IEP of the as-extruded substrate registered higher current efficiency (⁓38%) than the ground substrate (⁓30%). IEP realizing a rapid improvement in the line profile and Ra roughness of the ground Fe-Cr-Ni alloy shows that IEP can efficiently improve the performance of functional inner surfaces to application grade.

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Section: Resultsmentioning

confidence: 99%

Highly Efficient Inner Surface Polishing of Fe-Cr-Ni Alloy Cylinder via Isotropically Tuned Electrochemical Etching

Ajmal¹,

Zhan²,

Yi³

et al. 2022

J. Electrochem. Soc.

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“…From Tables 6 and 7 it is clear that residual stress in machined surfaces of titanium alloys for experiments and simulations under explored ranges of cutting [34][35][36][37][38] in machining of titanium alloys. Chen et al [21] reported that due to segmental chip formation in machining of titanium alloys which generate non-uniform temperature distribution, less tensile and more compressive stress is produced over machined surface.…”

Section: Resultsmentioning

confidence: 99%

Prediction of residual stress using RSM during turning of Ti–6Al–4V with the 3D FEM assist and experiments

Sahu

Andhare

2019

SN Appl. Sci.

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Machining of titanium alloy is known to be complex due to problems like low thermal conductivity, high thermal and residual stresses, chemical reactions, phase transformation during process, etc. These complexities affect the quality of surface produced and hence the performance of machined components. In the evaluation of surface integrity of machined components, residual stresses are the most critical response as it affects fatigue life of component. Present work aimed at developing prediction model for the residual stress induced due to machining of Ti-6Al-4V. 3D finite element simulations are performed to determine residual stress in turning of Ti-6Al-4V using carbide inserts. Simulations are performed in sequential manner using design of experiments through response surface methodology and an empirical model is developed. Later on actual machining is performed for few of the experimental runs and residual stresses are measured through X-ray diffraction method and the simulation results are compared with experimental results. These results are found in good agreement with average absolute error of 11%. The influence of the feed rate, cutting speed and depth of cut variations on the induced residual stress is investigated and analysed using analysis of variance. Results show that magnitude of surface compressive residual stress increases with cutting speed and depth of cut whereas it reduces with feed rate. Additionally, optimization was done with response surface desirability approach for optimum cutting parameters to maximize surface compressive residual stress. Optimum cutting parameters were found as cutting speed 171.4 m/min (1704.5 RPM), feed rate 0.07 mm/rev and 0.8 mm depth of cut (doc) with corresponding residual stress as − 1495.97 MPa.

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“…During processing, metals often form part deformation and non-uniform stress. In grinding process, the residual stress forms on the specimen surface mainly due to the plastic deformation and temperature change during grinding process [37]. Normally, the corrosion occurs easily in high tensile stress and high energy state [38].…”

Section: Resultsmentioning

confidence: 99%

An Investigation of Surface Corrosion Behavior of Inconel 718 after Robotic Belt Grinding

Wang

Zhang

et al. 2018

Materials

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Surface corrosion resistance of nickel-based superalloys after grinding is an important consideration to ensure the service performance. In this work, robotic belt grinding is adopted because it offers controllable material processing by dynamically controlling process parameters and tool-workpiece contact state. Surface corrosion behavior of Inconel 718 after robotic belt grinding was investigated by electrochemical testing in 3.5 wt % NaCl solution at room temperature. Specimens were characterized by morphology, surface roughness and residual stress systematically. The potentiodynamic polarization curves and electrochemical impedance spectroscopy (EIS) analysis indicate the corrosion resistance of the specimen surface improves remarkably with the decrease of abrasive particle size. It can be attributed to the change of surface roughness and residual stress. The energy dispersive X-ray spectroscopy (EDS) indicates that niobium (Nb) is preferentially attacked in the corrosion process. A plausible electrochemical dissolution behavior for Inconel 718 processed by robotic belt grinding is proposed. This study is of significance for achieving desired corrosion property of work surface by optimizing grinding process parameters.

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Residual Stress and Affected Layer in Disc Milling of Titanium Alloy

Cited by 21 publications

References 22 publications

Highly Efficient Inner Surface Polishing of Fe-Cr-Ni Alloy Cylinder via Isotropically Tuned Electrochemical Etching

Highly Efficient Inner Surface Polishing of Fe-Cr-Ni Alloy Cylinder via Isotropically Tuned Electrochemical Etching

Prediction of residual stress using RSM during turning of Ti–6Al–4V with the 3D FEM assist and experiments

An Investigation of Surface Corrosion Behavior of Inconel 718 after Robotic Belt Grinding

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