Thermal and molten pool model in selective laser melting process of Inconel 625

  • Erdem Kundakcıoğlu
  • Ismail Lazoglu
  • Özgür Poyraz
  • Evren Yasa
  • Nuri Cizicioğlu


Nowadays, additive manufacturing via topology optimization creates new opportunities for weight reductions in aerospace industry where high fly-to-buy ratio is desired. Selective laser sintering of advanced engineering materials like nickel super alloys are also expanding to reduce the cost and time of the manufacturing in aerospace industry. Elevated temperature and temperature gradients are critical factors in selective laser sintering of metals and they significantly affect the quality and integrity factors of produced parts such as microstructures, porosity, residual stresses, and distortions. Therefore, the aerospace industry needs advanced simulation tools to predict the temperatures, temperature gradients, and molten pool geometries to better understand the physics of the selective laser melting process as well as for the process optimizations. This article introduces an adjustable finite element-based multi-physics and multi-software platform thermal model, for laser additive manufacturing in powder bed systems to predict the transient temperature and the molten pool geometry. The developed model is able to simulate 3D transient temperature and molten pool shape in the laser additive manufacturing process by including the features of melting and solidification, porous media, and temperature-dependent thermal material properties for different materials. A set of experiments of Inconel 625 is carried out in order to measure the size of the molten pool and to validate the developed thermal model. An experimental study on temperature distribution carried out with titanium and an experimental study on molten pool sizes carried out with Inconel 625 in the literature are also compared with the developed thermal model. The estimation errors of the developed model are in the range of 11–18%.


Selective laser melting Temperature distribution Molten pool Finite element analysis Inconel 625, titanium 


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The authors would like to thank the Undersecretariat for Defence Industries (SSM) of Turkey and Tusaş Engine Industries Inc. for supporting the project.


  1. 1.
    Levy GN, Ralf S, Kruth JP (2003) Rapid Manufacturing And Rapid Tooling With Layer Manufacturing (Lm) Technologies, State Of The Art And Future Perspectıves. CIRP Ann Manuf Technol 52(2):589–609. CrossRefGoogle Scholar
  2. 2.
    Bikas H, Stavropoulos P, Chryssolouris G (2016) Additive manufacturing methods and modeling approaches: a critical review. Int J Adv Manuf Technol 83:389–405. CrossRefGoogle Scholar
  3. 3.
    Chen L, He Y, Yang Y, Niu S, Ren H (2017) The research status and development trend of additive manufacturing technology. Int J Adv Manuf Technol 89:3651–3660. CrossRefGoogle Scholar
  4. 4.
    Jaeger JC (1942) Moving sources of heat and the temperature at sliding contacts. Proc R Soc 76:203–224Google Scholar
  5. 5.
    Huang Y, Khamesee MB, Toyserkani E (2016) A comprehensive analytical model for laser powder-fed additive manufacturing. Addit Manuf 12(A):90–99. CrossRefGoogle Scholar
  6. 6.
    Matsumoto M, Shiomi M, Osakada K, Abe F (2002) Finite Element Analysis of Single Layer Forming on Metallic Powder Bed in Rapid Prototyping by Selective Laser Processing. Int J Mach Tools Manuf 42(1):61–67. CrossRefGoogle Scholar
  7. 7.
    Tolochko NK, Arshinov MK, Gusarov AV, Titov VI, Laoui T, Froyen L (2003) Mechanism of Selective Laser Sintering and Heat Transfer in Ti Powder. Rapid Prototyp J 9(5):314–326. CrossRefGoogle Scholar
  8. 8.
    Li C, Guo YB, Zhao JB (2017) Interfacial phenomena and characteristics between the deposited material and substrate in selective laser melting Inconel 625. J Mater Process Technol 243:269–281. CrossRefGoogle Scholar
  9. 9.
    Farshidianfar MH, Khajepour A, Gerlich AP (2016) Real-time control of microstructure in laser additive manufacturing. Int J Adv Manuf Technol 82:1173–1186. CrossRefGoogle Scholar
  10. 10.
    Kolossov S, Boillat E, Glardon R, Fischer P, Locher M (2004) 3D FE simulation for temperature evolution in the selective laser sintering process. Int J Mach Tools Manuf 44(2–3):117–123. CrossRefGoogle Scholar
  11. 11.
    Nisar A, Schimidt MJJ, Sheikh MA, Li L (2003) Three-dimensional transient finite element analysis of the laser enamelling process and moving heat source and phase change considerations. Proc Inst Mech Eng B J Eng Manuf 217:753–764. CrossRefGoogle Scholar
  12. 12.
    Roberts IA, Wang CJ, Esterlein R, Stanford M, Mynors DJ (2009) A three-dimensional finite element analysis of the temperature field during laser melting of metal powders in additive layer manufacturing. Int J Mach Tool Manu 49:916–923. CrossRefGoogle Scholar
  13. 13.
    Ganci M, Zhu W, Buffa G, Fratini L, Bo S, Yan C (2017) A macroscale FEM-based approach for selective laser sintering of thermoplastics. Int J Adv Manuf Technol 91:3169–3180. CrossRefGoogle Scholar
  14. 14.
    Somashekara MA, Naveenkumar M, Kumar A, Viswanath C, Simhambhatla S (2017) Investigations into effect of weld-deposition pattern on residual stress evolution for metallic additive manufacturing. Int J Adv Manuf Technol 90:2009–2025. CrossRefGoogle Scholar
  15. 15.
    Kundakcioglu E, Lazoglu I, Rawal S (2016) Transient thermal modeling of laser-based additive manufacturing for 3D freeform structures. Int J Adv Manuf Technol 85(1):493–501. CrossRefGoogle Scholar
  16. 16.
    Wang Z, Denlinger E, Michaleris P, Stoica AD, Ma D, Beese AM (2017) Residual stress mapping in Inconel 625 fabricated through additive manufacturing: Method for neutron diffraction measurements to validate thermomechanical model predictions. Mater Des 113:169–177. CrossRefGoogle Scholar
  17. 17.
    Sih SS, Barlow JW (2004) The prediction of the emissivity and thermal conductivity of powder beds. Part Sci Technol 22(3):291–304. CrossRefGoogle Scholar
  18. 18.
    Mills KC (2002) Recommended Values of Thermophysical Properties for Selected Commercial. Woodhead Publishing, CambridgeCrossRefGoogle Scholar

Copyright information

© Springer-Verlag London Ltd., part of Springer Nature 2018

Authors and Affiliations

  • Erdem Kundakcıoğlu
    • 1
  • Ismail Lazoglu
    • 1
  • Özgür Poyraz
    • 2
  • Evren Yasa
    • 3
  • Nuri Cizicioğlu
    • 2
  1. 1.Manufacturing and Automation Research Center, Mechanical Engineering DepartmentKoc UniversityIstanbulTurkey
  2. 2.TUSAŞ Engine Industries Inc.EskişehirTurkey
  3. 3.Eskişehir Osmangazi UniversityDepartment of Mechanical EngineeringEskişehirTurkey

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