Analysis of Effect of Heat Treatment on Machining Characteristics During Micro-end Milling of Inconel 718

  • Ankit Awasthi
  • N. Anand KrishnanEmail author
  • Jose Mathew
Conference paper
Part of the Lecture Notes on Multidisciplinary Industrial Engineering book series (LNMUINEN)


Miniaturized products are getting great importance in highly growing industries such as aerospace, automobile, and biomedical due to the high demand and great applications of micro part/feature. Out of the different micromachining techniques, micro-end milling is one of the preferred processes because of its flexibility, ability to produce complex part, and high material removal rate. A detailed analysis of cutting force and areal surface roughness during micro-end milling of Inconel 718 is performed to analyze the effect of heat treatment on machining characteristics. The different heat treatments were performed on Inconel 718 at 920 °C. Micro-end milling experiments on different heat-treated samples by varying feed per tooth were conducted. The cutting force was measured using KISTLER dynamometer (9256C2) and areal surface roughness is measured using Alicona 3D optical profiler (Infinite Focus G5). Comparative analyzes of different heat-treated samples were analyzed. It was found that the cutting force, as well as areal surface roughness, shows a similar trend under different heat treatment conditions. At lower feed per tooth higher cutting force was observed with nonlinear pattern due to the higher plowing force. Size effect in cutting force was observed near to 1 µm feed per tooth. Outside the size effect region, both cutting force and areal surface roughness show the trend similar to macro-machining. The minimum value of areal surface roughness is obtained for water quenching condition. The minimum value of areal surface roughness obtained near to 3 µm, which is the cutting edge radius of the micro endmill cutter.


Micro-end milling Microstructure Heat treatment Cutting force Areal surface roughness Inconel 718 



The authors would like to sincerely thank Department of Science and Technology (DST), Govt. of India, and Centre for Precision Measurements and Nanomechanical Testing, Department of Mechanical Engineering, National Institute of Technology Calicut, for providing support to carry out this work under the scheme ‘‘Fund for Improvement of Science and Technology’’ (No. SR/FST/ETI-388/2015).


  1. 1.
    Iturbe, A., Giraud, E., Hormaetxe, E., Garay, A., Germain, G., Ostolaza, K., Arrazola, P.J.: Mechanical characterization and modelling of Inconel 718 material behavior for machining process assessment. Mater. Sci. Eng. A 682, 441–453 (2017)CrossRefGoogle Scholar
  2. 2.
    Pan, Z., Feng, Y., Lu, Y.T., Lin, Y.F., Hung, T.P., Hsu, F.C., Liang, S.: Force modeling of Inconel 718 laser-assisted end milling under recrystallization effects. Int. J. Adv. Manuf. Technol. 92(5–8), 2965–2974 (2017)CrossRefGoogle Scholar
  3. 3.
    Venkatachalam, S., Fergani, O., Li, X., Yang, J.G., Chiang, K.N., Liang, S.Y.: Microstructure effects on cutting forces and flow stress in ultra-precision machining of polycrystalline brittle materials. J. Manuf. Sci. Eng. 137(2), 0210201-8 (2015)Google Scholar
  4. 4.
    Rahman, M.A., Rahman, M., Kumar, A.S.: Modelling of flow stress by correlating the material grain size and chip thickness in ultra-precision machining. Int. J. Mach. Tools Manuf. 123, 57–75 (2017)CrossRefGoogle Scholar
  5. 5.
    Nouari, M., Makich, H.: Experimental investigation on the effect of the material microstructure on tool wear when machining hard titanium alloys: Ti–6Al–4V and Ti-555. Int. J. Refract. Met. Hard Mater. 41, 259–269 (2013)CrossRefGoogle Scholar
  6. 6.
    Vipindas, K., Anand, K.N., Mathew, J.: Effect of cutting edge radius on micro end milling: force analysis, surface roughness, and chip formation. Int. J. Adv. Manuf. Technol. 97, 711–722 (2018)CrossRefGoogle Scholar
  7. 7.
    Pan, Z., Feng, Y., Liang, S.Y.: Material microstructure affected machining: a review. Manuf. Rev. 4, 1–12 (2017)Google Scholar
  8. 8.
    Vogler, M.P., DeVor, R.E., Kapoor, S.G.: On the Modeling and analysis of machining performance in micro-endmilling, part I: surface generation. J. Manuf. Sci. Eng. 126(4), 685–694 (2005)CrossRefGoogle Scholar
  9. 9.
    Fernando, B.O., Alessandro, R.R., Reginaldo, T.C., Adriano, F.S.: Size effect and minimum chip thickness in micromilling. Int. J. Adv. Manuf. Technol. 89, 39–54 (2015)Google Scholar

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© Springer Nature Singapore Pte Ltd. 2019

Authors and Affiliations

  1. 1.Department of Mechanical EngineeringNational Institute of Technology CalicutKozhikodeIndia

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