Effect of ultrasonic impact treatment on the surface integrity of nickel alloy 718

Abstract

Ultrasonic impact treatment (UIT) is a type of surface strengthening technology that can improve the fatigue properties of materials by improving the surface quality, residual stress, and other aspects. In this study, the influence of ultrasonic impact parameters on the surface integrity of nickel alloy 718 was studied. The micro stress concentration caused by the surface morphology was also explored. The cosine and exponential decay functions were used to fit and characterize the distribution of residual stress and work hardening in the surface material. The results showed that the feed rate had the greatest influence on surface roughness, stress concentration, and surface residual stress. It was not appropriate to evaluate the surface hardening effect only by the number of impacts per unit area, the ultrasonic impact parameters such as feed speed and pre extrusion depth should also be considered. The grain refinement was obvious after UIT. The multi-objective optimization of machining parameters was performed with the objective of surface stress concentration and residual stress. A surface with a smaller surface stress concentration factor and larger compressive residual stress can be obtained simultaneously using medium linear velocity, medium pre extrusion depth, and smaller feed rate.

Keywords

Nickel alloy 718 / Ultrasonic impact / Surface stress concentration / Surface integrity / Grain refinement

References

[1] Suárez A, Veiga F, de Lacalle LNL, et al. Effects of ultrasonics-assisted face milling on surface integrity and fatigue life of Ni-alloy 718. J Mater Eng Perform, 2016, 25: 5076-5086.

[2] Suárez A, Veiga F, Polvorosa R, et al. Surface integrity and fatigue of non-conventional machined alloy 718. J Manuf Process, 2019, 48: 44-50.

[3] Bozdana AT, Gindy NNZ. Comparative experimental study on effects of conventional and ultrasonic deep cold rolling processes on Ti-6Al-4V. Mater Sci Technol, 2008, 24: 1378-1384.

[4] Schulze V, Bleicher F, Groche P, et al. Surface modification by machine hammer peening and burnishing. CIRP Ann - Manuf Technol, 2016, 65: 809-832.

[5] Hessert R, Bamberg J (2008) Ultrasonic impact treatment for surface hardening of the aero-engine material IN718. ICSP 410–415

[6] Zhang K, Liu Y, Liu S, et al. Coordinated bilateral ultrasonic surface rolling process on aero-engine blades. Int J Adv Manuf Technol, 2019, 105: 4415-4428.

[7] Cherif A, Pyoun Y, Scholtes B. Effects of ultrasonic nanocrystal surface modification (UNSM) on residual stress state and fatigue strength of AISI 304. J Mater Eng Perform, 2010, 19: 282-286.

[8] Cao XJ, Pyoun YS, Murakami R. Fatigue properties of a S45C steel subjected to ultrasonic nanocrystal surface modification. Appl Surf Sci, 2010, 256: 6297-6303.

[9] Li G, Qu SG, Pan YX, et al. Effects of the different frequencies and loads of ultrasonic surface rolling on surface mechanical properties and fretting wear resistance of HIP Ti-6Al-4V alloy. Appl Surf Sci, 2016, 389: 324-334.

[10] Liu Y, Wang LJ, Wang DP (2011) Study on ultrasonic surface rolling process using FEM analysis. Adv Mater Res 2112–2115

[11] Liu Y, Wang L, Wang D. Finite element modeling of ultrasonic surface rolling process. J Mater Process Technol, 2011, 211: 2106-2113.

[12] Vasylyev MA, Chenakin SP, Yatsenko LF. Ultrasonic impact treatment induced oxidation of Ti6Al4V alloy. Acta Mater, 2016, 103: 761-774.

[13] Ohta T. Numerical analysis of effect of pin tip radius on residual stress distribution in ultrasonic impact treatment. Mater Trans, 2018, 59: 656-662.

[14] Liu Y, Zhao X, Wang D. Effective FE model to predict surface layer characteristics of ultrasonic surface rolling with experimental validation. Mater Sci Technol (UK), 2014, 30: 627-636.

[15] Lu LX, Sun J, Li L, Xiong QC. Study on surface characteristics of 7050-T7451 aluminum alloy by ultrasonic surface rolling process. Int J Adv Manuf Technol, 2016, 87: 2533-2539.

[16] Dutta RK, Malet L, Gao H, et al. Formation of nanostructures in severely deformed high-strength steel induced by high-frequency ultrasonic impact treatment. Metall Mater Trans A Phys Metall Mater Sci, 2014, 46: 813-830.

[17] Zhang Q, Hu Z, Su W, et al. Microstructure and surface properties of 17-4PH stainless steel by ultrasonic surface rolling technology. Surf Coat Technol, 2017, 321: 64-73.

[18] Li L, Kim M, Lee S, et al. Influence of multiple ultrasonic impact treatments on surface roughness and wear performance of SUS301 steel. Surf Coat Technol, 2016, 307: 517-524.

[19] Amini AK. Steel 7225 surface ultrafine structure and improvement of its mechanical properties using surface nanocrystallization technology by ultrasonic impact. Int J Adv Manuf Technol, 2016, 83: 1127-1134.

[20] Cheng M, Zhang D, Chen H, et al. Surface nanocrystallization and its effect on fatigue performance of high-strength materials treated by ultrasonic rolling process. Int J Adv Manuf Technol, 2016, 83: 123-131.

[21] He B, Deng H, Jiang M, et al. Effect of ultrasonic impact treatment on the ultra high cycle fatigue properties of SMA490BW steel welded joints. Int J Adv Manuf Technol, 2018, 96: 1571-1577.

[22] Ma C, Andani MT, Qin H, et al. Improving surface finish and wear resistance of additive manufactured nickel-titanium by ultrasonic nano-crystal surface modification. J Mater Process Technol, 2017, 249: 433-440.

[23] Panin AV, Kazachenok MS, Kozelskaya AI, et al. The effect of ultrasonic impact treatment on the deformation behavior of commercially pure titanium under uniaxial tension. Mater Des, 2017, 117: 371-381.

[24] Arola D. Surface texture and the stress concentration factor for FRP components with holes. J Compos Mater, 2009, 37: 1439-1460.

[25] Ulutan D, Arisoy YM, Özel T, et al. Empirical modeling of residual stress profile in machining nickelbased superalloys using the sinusoidal decay function. Procedia CIRP, 2014, 13: 365-370.

Funding

National Natural Science Foundation of China http://dx.doi.org/10.13039/501100001809(51875472)

National Key Research and Development Plan in Shaanxi Province of China(2019ZDLGY02-03)