Abstract
The melt pool characteristics in terms of size and shape and the porosity development in laser powder bed fusion–processed Inconel 718 were investigated to determine how laser power and scan speed influence the porosity in the microstructure. The melt pool characteristics developed with both single-track and multilayer bulk laser deposition were evaluated. It was found that the melt pool characteristic is critical for the porosity development. It is shown that the porosity fraction and pore shape change depending on the melt pool size and shape. This result is explained based on the local energy density of a laser during the process. High-density (> 99%) Inconel 718 samples were achieved over a wide range of laser energy densities (J/mm2). A careful assessment shows that the laser power and scan speed affect differently in developing the pores in the samples. The porosity decreased rapidly with the increase in laser power while it varied linearly with the scan speed. A proper combination, however, led to fully dense samples. The study reveals an optimum condition in terms of laser power and scan speed that can be adopted to fabricate high-density Inconel 718 parts using laser powder bed fusion–based additive manufacturing process.
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Arısoy YM, Criales LE, Özel T et al (2017) Influence of scan strategy and process parameters on microstructure and its optimization in additively manufactured nickel alloy 625 via laser powder bed fusion. Int J Adv Manuf Technol 90:1393–1417. https://doi.org/10.1007/s00170-016-9429-z
Criales LE, Arısoy YM, Lane B et al (2017) Laser powder bed fusion of nickel alloy 625: experimental investigations of effects of process parameters on melt pool size and shape with spatter analysis. Int J Mach Tools Manuf 121:22–36. https://doi.org/10.1016/j.ijmachtools.2017.03.004
Wang X, Gong X, Chou K (2017) Review on powder-bed laser additive manufacturing of Inconel 718 parts. Proc Inst Mech Eng B J Eng Manuf 231:1890–1903. https://doi.org/10.1177/0954405415619883
Kempen K, Thijs L, Yasa E, et al (2011) Process optimization and microstructural analysis for selective laser melting of AlSi10Mg. pp 484–495
Kamath C, El-dasher B, Gallegos GF et al (2014) Density of additively-manufactured, 316L SS parts using laser powder-bed fusion at powers up to 400 W. Int J Adv Manuf Technol 74:65–78
Jia Q, Gu D (2014) Selective laser melting additive manufacturing of Inconel 718 superalloy parts: densification, microstructure and properties. J Alloys Compd 585:713–721. https://doi.org/10.1016/j.jallcom.2013.09.171
Song B, Dong S, Liao H, Coddet C (2012) Process parameter selection for selective laser melting of Ti6Al4V based on temperature distribution simulation and experimental sintering. Int J Adv Manuf Technol 61:967–974
Sun J, Yang Y, Wang D (2013) Parametric optimization of selective laser melting for forming Ti6Al4V samples by Taguchi method. Opt Laser Technol 49:118–124
Dilip JJS, Zhang S, Teng C et al (2017) Influence of processing parameters on the evolution of melt pool, porosity, and microstructures in Ti-6Al-4V alloy parts fabricated by selective laser melting. Progress in Additive Manufacturing 2:157–167. https://doi.org/10.1007/s40964-017-0030-2
Maamoun AH, Xue YF, Elbestawi MA, Veldhuis SC (2018) Effect of SLM process parameters on the quality of Al alloy parts; part II: microstructure and mechanical properties. https://doi.org/10.20944/preprints201811.0026.v1
Riedlbauer D, Scharowsky T, Singer RF et al (2017) Macroscopic simulation and experimental measurement of melt pool characteristics in selective electron beam melting of Ti-6Al-4V. Int J Adv Manuf Technol 88:1309–1317. https://doi.org/10.1007/s00170-016-8819-6
Fotovvati B, Wayne SF, Lewis G, Asadi E (2018) A review on melt-pool characteristics in laser welding of metals. Adv Mater Sci Eng 2018:1–18. https://doi.org/10.1155/2018/4920718
Gu H, Gong H, Pal D, et al (2013) Influences of energy density on porosity and microstructure of selective laser melted 17-4PH stainless steel
Sames WJ, List F, Pannala S et al (2016) The metallurgy and processing science of metal additive manufacturing. Int Mater Rev 61:315–360
Choi J-P, Shin G-H, Yang S et al (2017) Densification and microstructural investigation of Inconel 718 parts fabricated by selective laser melting. Powder Technol 310:60–66. https://doi.org/10.1016/j.powtec.2017.01.030
Paria Karimi Neghlani (2016) SLM additive manufacturing of alloy 718 effect of process parameters on microstructure and properties. PhD thesis, University West
Mertens R, Clijsters S, Kempen K, Kruth J-P (2014) Optimization of scan strategies in selective laser melting of aluminum parts with downfacing areas. J Manuf Sci Eng 136:061012
Teng C, Ashby K, Phan N et al (2016) The effects of material property assumptions on predicted meltpool shape for laser powder bed fusion based additive manufacturing. Meas Sci Technol 27:085602. https://doi.org/10.1088/0957-0233/27/8/085602
Kasperovich G, Hausmann J (2015) Improvement of fatigue resistance and ductility of TiAl6V4 processed by selective laser melting. J Mater Process Technol 220:202–214. https://doi.org/10.1016/j.jmatprotec.2015.01.025
AlMangour B, Grzesiak D, Borkar T, Yang J-M (2018) Densification behavior, microstructural evolution, and mechanical properties of TiC/316L stainless steel nanocomposites fabricated by selective laser melting. Mater Des 138:119–128. https://doi.org/10.1016/j.matdes.2017.10.039
Jia Q, Gu D (2014) Selective laser melting additive manufacturing of Inconel 718 superalloy parts: high-temperature oxidation property and its mechanisms. Opt Laser Technol 62:161–171. https://doi.org/10.1016/j.optlastec.2014.03.008
Cherry JA, Davies HM, Mehmood S et al (2015) Investigation into the effect of process parameters on microstructural and physical properties of 316L stainless steel parts by selective laser melting. Int J Adv Manuf Technol 76:869–879. https://doi.org/10.1007/s00170-014-6297-2
Yang J, Han J, Yu H et al (2016) Role of molten pool mode on formability, microstructure and mechanical properties of selective laser melted Ti-6Al-4V alloy. Mater Des 110:558–570. https://doi.org/10.1016/j.matdes.2016.08.036
Kamath C (2016) Data mining and statistical inference in selective laser melting. Int J Adv Manuf Technol 86:1659–1677
Fotovvati B, Namdari N, Dehghanghadikolaei A (2018) Fatigue performance of selective laser melted Ti6Al4V components: state of the art. Materials Research Express 6:012002. https://doi.org/10.1088/2053-1591/aae10e
Hack H, Link R, Knudsen E et al (2017) Mechanical properties of additive manufactured nickel alloy 625. Additive Manufacturing 14:105–115
Zadi-Maad A, Basuki A (2018) The development of additive manufacturing technique for nickel-base alloys: a review. AIP Publishing, New York, p 020064
DebRoy T, Wei HL, Zuback JS et al (2018) Additive manufacturing of metallic components—process, structure and properties. Prog Mater Sci 92:112–224. https://doi.org/10.1016/j.pmatsci.2017.10.001
Criales LE, Arısoy YM, Lane B et al (2017) Predictive modeling and optimization of multi-track processing for laser powder bed fusion of nickel alloy 625. Addit. Manuf 13:14–36
Manfredi D, Calignano F (2017) Laser powder bed fusion of aluminum, titanium and nickel based alloys: materials and design investigations. IEEE:1423–1425
Gong H, Teng C, Zeng K, et al (2016) Single track of selective laser melting Ti-6Al-4V powder on support structure
Dilip J, Anam MA, Pal D, Stucker B (2016) A short study on the fabrication of single track deposits in SLM and characterization
Brooks J, Bridges P (1988) Metallurgical stability of Inconel alloy 718. Superalloys 88:33–42
Eiselstein H, Tillack D (1991) The invention and definition of alloy 625. Superalloys 718:1–14
Sharman ARC, Amarasinghe A, Ridgway K (2008) Tool life and surface integrity aspects when drilling and hole making in Inconel 718. J Mater Process Technol 200:424–432. https://doi.org/10.1016/j.jmatprotec.2007.08.080
Parida AK, Maity K (2018) Comparison the machinability of Inconel 718, Inconel 625 and Monel 400 in hot turning operation. Engineering Science and Technology, an International Journal 21:364–370. https://doi.org/10.1016/j.jestch.2018.03.018
Narutaki N, Yamane Y, Hayashi K et al (1993) High-speed machining of Inconel 718 with ceramic tools. CIRP Ann 42:103–106. https://doi.org/10.1016/S0007-8506(07)62402-0
Blackwell PL (2005) The mechanical and microstructural characteristics of laser-deposited IN718. J Mater Process Technol 170:240–246. https://doi.org/10.1016/j.jmatprotec.2005.05.005
Amato KN, Gaytan SM, Murr LE et al (2012) Microstructures and mechanical behavior of Inconel 718 fabricated by selective laser melting. Acta Mater 60:2229–2239. https://doi.org/10.1016/j.actamat.2011.12.032
Pröbstle M, Neumeier S, Hopfenmüller J et al (2016) Superior creep strength of a nickel-based superalloy produced by selective laser melting. Mater Sci Eng A 674:299–307. https://doi.org/10.1016/j.msea.2016.07.061
Bean GE, Witkin DB, McLouth TD, Zaldivar RJ (2018) The effect of laser focus and process parameters on microstructure and mechanical properties of SLM Inconel 718. International Society for Optics and Photonics, p 105230Y
Moussaoui K, Rubio W, Mousseigne M et al (2018) Effects of selective laser melting additive manufacturing parameters of Inconel 718 on porosity, microstructure and mechanical properties. Mater Sci Eng A 735:182–190. https://doi.org/10.1016/j.msea.2018.08.037
Khairallah SA, Anderson AT, Rubenchik A, King WE (2016) Laser powder-bed fusion additive manufacturing: physics of complex melt flow and formation mechanisms of pores, spatter, and denudation zones. Acta Mater 108:36–45
Seifi M, Salem A, Beuth J et al (2016) Overview of materials qualification needs for metal additive manufacturing. Jom 68:747–764
Gong H, Rafi K, Gu H et al (2014) Analysis of defect generation in Ti–6Al–4V parts made using powder bed fusion additive manufacturing processes. Addit. Manuf 1:87–98
Gorsse S, Hutchinson C, Gouné M, Banerjee R (2017) Additive manufacturing of metals: a brief review of the characteristic microstructures and properties of steels, Ti-6Al-4V and high-entropy alloys. Sci Technol Adv Mater 18:584–610. https://doi.org/10.1080/14686996.2017.1361305
Xia M, Gu D, Yu G et al (2017) Porosity evolution and its thermodynamic mechanism of randomly packed powder-bed during selective laser melting of Inconel 718 alloy. Int J Mach Tools Manuf 116:96–106. https://doi.org/10.1016/j.ijmachtools.2017.01.005
Sadowski M, Ladani L, Brindley W, Romano J (2016) Optimizing quality of additively manufactured Inconel 718 using powder bed laser melting process. Addit. Manuf 11:60–70. https://doi.org/10.1016/j.addma.2016.03.006
Laoui T, Froyen L, Yadroitsev IA et al (2004) Balling processes during selective laser treatment of powders. Rapid Prototyp J 10:78–87. https://doi.org/10.1108/13552540410526953
Mumtaz KA, Hopkinson N (2010) Selective laser melting of thin wall parts using pulse shaping. J Mater Process Technol 210:279–287. https://doi.org/10.1016/j.jmatprotec.2009.09.011
Kasperovich G, Haubrich J, Gussone J, Requena G (2016) Correlation between porosity and processing parameters in TiAl6V4 produced by selective laser melting. Mater Des 105:160–170. https://doi.org/10.1016/j.matdes.2016.05.070
Gong H, Rafi K, Karthik NV, et al (2013) The effects of processing parameters on defect regularity in Ti-6Al-4V parts fabricated by selective laser melting and electron beam melting. pp 440–453
Thijs L, Verhaeghe F, Craeghs T et al (2010) A study of the microstructural evolution during selective laser melting of Ti–6Al–4V. Acta Mater 58:3303–3312. https://doi.org/10.1016/j.actamat.2010.02.004
Dai D, Gu D (2014) Thermal behavior and densification mechanism during selective laser melting of copper matrix composites: simulation and experiments. Mater Des 55:482–491. https://doi.org/10.1016/j.matdes.2013.10.006
Pang S, Chen W, Wang W (2014) A quantitative model of keyhole instability induced porosity in laser welding of titanium alloy. Metall Mater Trans A 45:2808–2818
Vilaro T, Colin C, Bartout JD (2011) As-fabricated and heat-treated microstructures of the Ti-6Al-4V alloy processed by selective laser melting. Metall Mater Trans A 42:3190–3199. https://doi.org/10.1007/s11661-011-0731-y
Tan JL, Tang C, Wong CH (2018) A computational study on porosity evolution in parts produced by selective laser melting. Metall and Mat Trans A 49:3663–3673 https://doi.org/10.1007/s11661-018-4697-x
Akram J, Chalavadi P, Pal D, Stucker B (2018) Understanding grain evolution in additive manufacturing through modeling. Addit. Manuf 21:255–268. https://doi.org/10.1016/j.addma.2018.03.021
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The authors PK, JF, and MM duly acknowledge the partial financial support from the Roger and Dawn Center for Renewable Energy Center at the University of Utah.
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Kumar, P., Farah, J., Akram, J. et al. Influence of laser processing parameters on porosity in Inconel 718 during additive manufacturing. Int J Adv Manuf Technol 103, 1497–1507 (2019). https://doi.org/10.1007/s00170-019-03655-9
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DOI: https://doi.org/10.1007/s00170-019-03655-9