Influence of the laser shock peening density on the residual stresses depth and level in the titanium alloy specimens

The paper examines the influence of laser shock peening power density on the residual stresses depth and level in the titanium alloy specimens. The shot blasting and hydro-shot peening methods used in the aircraft engine manufacture are creating a favorable residual stress diagram to the depth of 0.2 mm. However, this is insufficient to ensure the required level of the elements fatigue strength when damaged by foreign objects to the depth of 1.0 mm. The paper considers hardening a flat specimen measuring 50?40?2 mm by the laser shock peening. It shows a possibility to achieve the residual compressive stress depth of more than 0.3 mm, which is better than with the hydro-shot peening. It is found that at the radiation power density of more than 0.5 I/Imax, the residual stresses level and depth are reaching the asymptote equal to –0.8 rel. units. With an increase in the number of passes, the residual compressive stresses level grows by 10...15%. Increasing the laser spots overlap coefficient also leads to an increase in the residual stresses depth and level. The spot shape is not affecting depth and level of the residual compressive stresses. The paper indicates that after intensive treatment of the specimen surface (with a number of passes more than two) at the radiation power density above 0.5 I/Imax, the surface degradation effect appears.
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References

[1] Inozemtsev A.A., Nikhamkin M.A., Sandratskiy V.L. Osnovy konstruirovaniya aviatsionnykh dvigateley i energeticheskikh ustanovok. T. 2 [Fundamentals of design of aircraft engines and power plants. Vol. 2]. Moscow, Mashinostroenie Publ., 2008. 368 p. (In Russ.).

[2] Nguen T.Sh. Metodika otsenki vliyaniya ekspluatatsionnykh povrezhdayushchikh vozdeystviy na kachestvo funktsionirovaniya kompressora GTD. Avtoref. diss. kand. tekh. nauk [Methodology of estimation of influence of operational damaging influences on quality of functioning of GTE compressor. Abs. kand. tech. sci. diss.]. Moscow, MAI Publ., 2022. 24 p. (In Russ.).

[3] Volkov D.I., Gushchin A.Yu., Rykunov A.N. Technological possibilities of processing by metal and glass microspheres of materials VT9 and EI787VD. Uprochnyayushchie tekhnologii i pokrytiya [Strengthening Technologies and Coatings], 2017, vol. 13, no. 8, pp. 365–369. (In Russ.).

[4] Nepein K.G., Selivanov I.A. Improving the fatigue resistance characteristics of compressor blades made of titanium alloy. Vestnik PNIPU. Aerokosmicheskaya tekhnika [PNRPU Aerospace Engineering Bulletin], 2019, no. 57, pp. 129–136, doi: https://doi.org/10.15593/2224-9982/2019.57.10 (in Russ.).

[5] Shiryaev A.A., Gabov I.G., Milenin A.S. Influence of laser impact hardening on the parameters of the surface layer of turbine engine compressor blades made of titanium alloy. Vestnik PNIPU. Mashinostroenie, materialovedenie [Bulletin PNRPU. Mechanical Engineering, Materials Science], 2024, no. 1, pp. 66–73. (In Russ.).

[6] Shiryaev A.A., Gabov I.G., Popova Yu.V. LSPwC influence on the surface layer parameters of the titanium alloy GTE compressor blades. Izvestiya vysshikh uchebnykh zavedeniy. Mashinostroenie [BMSTU Journal of Mechanical Engineering], 2024, no. 3, pp. 32–41. EDN: JEEASU (In Russ.).

[7] Novikov I.A., Nozhnitskiy Yu.A., Shibaev S.A. International experience in research and application of the technological process of laser shockpeening of metals (review). Aviatsionnye dvigateli [Aviation Engines], 2022, no. 2, pp. 59–82, doi: https://doi.org/10.54349/26586061_2022_1_59 (in Russ.).

[8] Gachetova E.A., Sikhamov R., Fentske F. et al. Influence of laser shock peening on low- and high-cycle fatigue of an ot4-0 titanium alloy. Prikladnaya mekhanika i tekhnicheskaya fizika, 2022, vol. 63, no. 2, pp. 182–191, doi: https://doi.org/10.15372/PMTF20220217 (in Russ.). (Eng. version: J. Appl. Mech. Tech. Phy., 2022, vol. 63, no. 2, pp. 335–342, doi: https://doi.org/10.1134/S0021894422020171)

[9] Sundar R., Ganesh P., Gupta R.K. et al. Laser shock peening and its applications: a review. Lasers Manuf. Mater. Process., 2019, vol. 6, no. 7, pp. 424–463, doi: https://doi.org/10.1007/s40516-019-00098-8

[10] Shiryaev A.A., Gabov I.G., Milenin A.S. et al. Comparison of hardening methods on blades of titanium alloy. Vestnik PNIPU. Mashinostroenie, materialovedenie [Bulletin PNRPU. Mechanical Engineering, Materials Science], 2023, no. 4, pp. 109–117. (In Russ.).

[11] Lyakhovetskiy M.A., Korolev D.D., Kozhevnikov G.D. et al. Lazernoe udarnoe uprochnenie titanovogo splava VT6 s alyuminievym ablyatsionnym pokrytiem [Laser impact hardening of titanium alloy BT6 with aluminium ablative coating]. V: Bystrozakalennye materialy i pokrytiya [In: Rapidly hardened materials and coatings]. Moscow, Probel-2000 Publ., 2021, pp. 258–263. (In Russ.).

[12] Zo Y.M. Udarnaya obrabotka tsvetnykh metallov i splavov malomoshchnymi lazernymi istochnikami. Avtoref. diss. kand. tekh. nauk [Impact machining of non-ferrous metals and alloys by low-power laser sources. Abs. kand. tech. sci. diss.]. Moscow, Bauman MSTU Publ., 2020. 18 p. (In Russ.).

[13] Wang M., Konovalov S., Dai F. et al. Influence of process parameters on laser shock processing effect of aero-engine blades. J. Surf. Investig., 2022, vol. 16, no. 6, pp. 1208–1220, doi: https://doi.org/10.1134/S102745102206043X

[14] Nie X., He W., Li Q. et al. Experiment investigation on microstructure and mechanical properties of TC17 titanium alloy treated by laser shock peening with different laser fluence. J. Laser Appl., 2013, vol. 25, no. 4, art. 042001, doi: https://doi.org/10.2351/1.4800444

[15] Modelirovanie lazernoy udarnoy prokovki [Modelling of laser impact forging]. URL: https://www.icmm.ru/images/pages/news/newsfiles/supersonic/seminar_01_11_2022/Kostina_et.al._LSP_2022.pdf (accessed: 15.06.2024). (In Russ.).

[16] Kozhevnikov G.D. Razrabotka kompleksnoy matematicheskoy modeli lazernogo udara dlya resheniya inzhenernykh zadach. Optimizatsiya rezhimov obrabotki lazernym udarnym uprochneniem zharoprochnogo splava Inconel 718 chislennym modelirovaniem [Development of a complex mathematical model of laser shock for solving engineering problems. Optimisation of processing modes by laser shock hardening of Inconel 718 heat-resistant alloy by numerical simulation]. URL: https://www.icmm.ru/images/pages/news/newsfiles/supersonic/seminar_01_11_2022/Kozhevnikov.pdf (accessed: 15.06.2024). (In Russ.).

[17] Ye Y., Zhang Y., Huang T. et al. A critical review of laser shock peening of aircraft engine components. Adv. Eng. Mater., 2023, vol. 25, no. 16, art. 2201451, doi: https://doi.org/10.1002/adem.202201451

[18] Ledon D., Balakhnin A., Uvarov S. et al. Behavior of Zr–1Nb alloy in coarse- and ultrafine-grain states under laser-induced shock wave loading. Frat. ed Integrita Strutt., 2023, vol. 17, no. 66, pp. 164–177, doi: https://doi.org/10.3221/IGF-ESIS.66.10

[19] Zou Sh., Wu J., Zhang Y. et al. Surface integrity and fatigue lives of Ti17 compressor blades subjected to laser shock peening with square spots. Surf. Coat. Technol., 2018, vol. 347, pp. 398–406, doi: https://doi.org/10.1016/j.surfcoat.2018.05.023

[20] Sun V., Zhao J., Qiao H. et al. Effects of square spot size and beam quality on residual stress of 7050 aluminum alloy by laser shock peening. Mater. Chem. Phys., 2022, vol. 284, art. 126023, doi: https://doi.org/10.1016/j.matchemphys.2022.126023

[21] Rondepierre A., Sollier A., Videau L. et al. Review on laser interaction in confined regime: discussion about the plasma source term for laser shock applications and simulations. Metals, 2021, vol. 11, no. 12, art. 2032, doi: https://doi.org/10.3390/met11122032

[22] Bovid S., Kattoura M., Clauer A. et al. Pressure amplification and modelization in laser shock peening of Ti-6Al-4V and AA7085 with adhesive-backed opaque overlays. J. Mater. Process Technol., 2022, vol. 299, art. 117381, doi: https://doi.org/10.1016/j.jmatprotec.2021.117381