Numerical/experimental investigation of the effect of the laser treatment on the thickness distribution of a magnesium superplastically formed part

Abstract

The growing need for high-performance components in terms of shape and mechanical properties encourages the adoption of integrated technological solutions. In the present work, a novel methodology for affecting the superplastic behaviour and, in turn, the thickness distribution of magnesium alloy components is proposed. Through heat treatments using a CO₂ laser, the grain size was locally changed, thus modifying the superplastic behaviour in a predefined area of the blank. Both the grain coarsening produced by the laser heat treatment and the superplastic forming of the heat treated blank were simulated using a finite element model, which allowed to set the related process parameters for the manufacturing of the investigated case study (a truncated cone). The thermal finite element model of the laser heat treatment, calibrated using the experimental temperature evolutions acquired in specific areas during the heat treatment, was used to evaluate the influence of process parameters on the grain size evolution. The laser heat treatment was able to significantly promote the grain growth, increasing the mean grain size from about 8 µm to twice (about 17 µm). The resulting grain size distributions were implemented in the mechanical finite element model of the superplastic forming process and the combination of laser parameters which allowed to obtain the most uniform thickness distribution on the final component was finally experimentally reproduced and measured for validation purposes. Even in the case of the laboratory scale application, characterised by quite small dimensions, the proposed approach revealed to be effective, to improving the thinning factor (t_MIN/t_AVG) of the formed part from 0.85 to 0.89, and providing an increase in the thickness uniformity of about 4.7%.

Keywords

Laser heat treatment / Grain size / Super plastic behaviour / Finite element / Magnesium alloys / Thickness uniformity

References

[1] LiuB, YangJ, ZhangX, et al. . Development and application of magnesium alloy parts for automotive OEMs: a review. J Magnes Alloy, 2023, 11: 15-47.

[2] BergeroC, GosnellG, GielenD, et al. . Pathways to net-zero emissions from aviation. Nat Sustain, 2023, 6: 404-414.

[3] SeetharamanS, JayalakshmiS, Arvind SinghR, et al. . The potential of magnesium-based materials for engineering and biomedical applications. J Indian Inst Sci, 2022, 102: 421-437.

[4] GoldbachAK, BauerAM, WüchnerR, et al. . CAD-integrated parametric lightweight design with isogeometric B-rep analysis. Front Built Environ, 2020, 6: 44.

[5] SorgenteD, PalumboG, PiccininniA, et al. . Investigation on the thickness distribution of highly customized titanium biomedical implants manufactured by superplastic forming. CIRP J Manuf Sci Technol, 2018, 20: 29-35.

[6] Padmanabhan KA, Prabu SB, Mulyukov RR et al (2018) Superplastic forming, analyses and industrial applications. In: Superplasticity. Springer, Berlin, pp 359–428. https://doi.org/10.1007/978-3-642-31957-0_9

[7] SorgenteD, PalumboG, ScintillaLD, et al. . Superplastic forming of a complex shape automotive component with optimized heated tools. Mater Sci Forum, 2016, 838839494-499.

[8] SavaediZ, MotallebiR, MirzadehH, et al. . Superplasticity of fine-grained magnesium alloys for biomedical applications: a comprehensive review. Curr Opin Solid State Mater Sci, 2023, 272. 101058

[9] NazeerF, LongJ, YangZ, et al. . Superplastic deformation behavior of Mg alloys: a review. J Magnes Alloy, 2022, 10: 97-109.

[10] NeugebauerR, AltanT, GeigerM, et al. . Sheet metal forming at elevated temperatures. CIRP Ann, 2006, 552793-816.

[11] CarpenterAJ, AntoniswamyAR, CarterJT, et al. . A mechanism-dependent material model for the effects of grain growth and anisotropy on plastic deformation of magnesium alloy AZ31 sheet at 450 C. Acta Mater, 2014, 68: 254-266.

[12] ŠašekS, MinárikP, StráskáJ, et al. . Novel ultrafine-grain Mg-Gd/Nd-Y-Ca alloys with an increased ignition temperature. Materials, 2023, 1631299.

[13] KulekciMK. Magnesium and its alloys applications in automotive industry. Int J Adv Manuf Tech, 2008, 39: 851-865.

[14] KayaAAA, ErenD, TuranD, et al. . Evolution of microstructure and texture in AZ31 alloy subjected to gas forming. JOM, 2017, 69: 1041-1045.

[15] HuangA, LoweA, Cardew-HallMJ. Experimental validation of sheet thickness optimisation for superplastic forming of engineering structures. J Mater Process Technol, 2004, 1121136-143.

[16] ZhangKF, WangGF, WuDZ, et al. . Research on the controlling of the thickness distribution in superplastic forming. J Mater Process Technol, 2004, 1511/354-57.

[17] SorgenteD, PalumboG, ScintillaLD, et al. . Gas forming of an AZ31 magnesium alloy at elevated strain rates. Int J Adv Manuf Tech, 2016, 83: 861-872.

[18] DuttaA. Thickness-profiling of initial blank for superplastic forming of uniformly thick domes. Mat Sci Eng A, 2004, 3711/279-81.

[19] GiulianoG, PoliniW. Influence of the initial blank geometry on the final thickness distribution of the hemispheres in superplastic AZ31 alloy. Appl Sci, 2022, 1241912.

[20] PiccininniA, SorgenteD, PalumboG. GA-based optimization to control the thickness distribution in components manufactured via superplastic forming. J Manuf Process, 2023, 86: 126-135.

[21] JafarRA, JarrarFS, Al-HunitiNS. Two-stage approach for improving the thickness distribution in superplastic forming. J Mater Sci Res, 2014, 4112-27

[22] YiL, LiX, LiY, et al. . Investigation of the two-stage SPF process of aluminum alloy door frames. J Mater Res Technol, 2021, 15: 2873-8282.

[23] PalumboG, GuglielmiP, PiccininniA, et al. . Manufacturing of a hemispherical component combining incremental forming and superplastic forming. CIRP J Manuf Sci Technol, 2020, 31: 178-188.

[24] GeigerM, MerkleinM, VogtU. Aluminum tailored heat treated blanks. Prod Eng Res Devel, 2009, 3: 401.

[25] ReutherF, LieberT, HeidrichJ, et al. . Numerical investigations on thermal forming limit testing with local inductive heating for hot forming of AA7075. Materials, 2021, 1481882.

[26] Nishiwaki T, Sako R, Tsutamori H (2021) Hydro-mechanical deep drawing of locally solution-treated aluminum alloy sheets. In: Daehn G, Cao J, Kinsey B et al (eds) Forming the future. The minerals, metals & materials series. Springer, Cham. https://doi.org/10.1007/978-3-030-75381-8_226

[27] RigasN, MerkleinM. Numerical and experimental investigations for distortion-reduced laser heat treatment of aluminum. Prod Eng Res Devel, 2021, 15: 479-488.

[28] GeigerM, MerkleinM, KerauschM. Finite element simulation of deep drawing of tailored heat treated blanks. CIRP Ann, 2004, 531223-226.

[29] RhaipuS, WiseMLH, BatePS. Microstructural gradients in the superplastic forming of Ti-6Al-4V. Metall Mater Trans A, 2002, 33: 93-100.

[30] LeeY, KimJJ, KwonYN, et al. . Formability and grain size of AZ31 sheet in gas blow forming process. Procedia Eng, 2014, 81: 748-753.

[31] CusickM, Abu-FarhaF, LoursP, et al. . Superplastic forming of AZ31 magnesium alloy with controlled microstructure. Materwiss Werksttech, 2012, 439810-816.

[32] CaoX, JahaziM, ImmarigeonJP. A review of laser welding techniques for magnesium alloys. J Mater Process Technol, 2006, 1712188-204.

[33] ScintillaLD, TricaricoL. Experimental investigation on fiber and CO₂ inert gas fusion cutting of AZ31 magnesium alloy sheets. Opt Laser Technol, 2013, 46: 42-52.

[34] Zheng HY, Guan YC, Wang XC et al (2015) Tailoring material properties induced by laser surface processing. In: Lawrence J, Waugh DG (eds) Laser surface engineering. Woodhead Publishing, pp 317–357. https://doi.org/10.1016/B978-1-78242-074-3.00013-1

[35] JanaS, OlsztaM, EdwardsD, et al. . Microstructural basis for improved corrosion resistance of laser surface processed AZ31 Mg alloy. Corros Sci, 2021, 191. 109707

[36] SorgenteD, PalumboG, FortunatoA, et al. . Forming behaviour at elevated temperature of a laser heat-treated AZ31 magnesium alloy sheet. Mater Sci Forum, 2018, 941: 1270-1275.

[37] Guglielmi P, Sorgente D, Palumbo G (2021) Numerical/experimental investigation of bulge tests on a localized laser heat-treated magnesium alloy AZ31 sheet. In: The 24th international conference on material forming, ESAFORM, Belgique

[38] Standard practice for heat treatment of magnesium alloys. https://doi.org/10.1520/B0661-12R20

[39] Standard test methods for determining average grain size. https://doi.org/10.1520/E0112-10

[40] Luca G, Elisabetta C, Claudio G (2013) Fe modeling of the apparent spot technique in circular laser hardening. Int J Adv Manuf Technol 69(9/12):1961–1969. https://doi.org/10.1007/s00170-013-5162-z

[41] SorgenteD, ScintillaLD, PalumboG, et al. . Blow forming of AZ31 magnesium alloy at elevated temperatures. Int J Mater Form, 2010, 3: 13-19.

[42] Lee S, Ham HJ, Kwon SY et al (2013) Thermal conductivity of magnesium alloys in the temperature range from −125°C to 400°C. Int J Thermophys 34:2343–2350

[43] MiaoQ, HuL, WangX, et al. . Grain growth kinetics of a fine-grained AZ31 magnesium alloy produced by hot rolling. J Alloys Compd, 2010, 4931/287-90.

Funding

European Union - NextGenerationEU (National Sustainable Mobility Center CN00000023, Italian Ministry of University and Research(1033-17/06/2022)

RIGHTS & PERMISSIONS

Shanghai University and Periodicals Agency of Shanghai University and Springer-Verlag GmbH Germany, part of Springer Nature