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Analysis and Optimization of WEDM Performance Characteristics of Inconel 706 for Aerospace Application

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Abstract

Wire Electrical Discharge Machining (WEDM) has established itself for manufacturing of precise and complex shape components for aerospace application due to the high quality requirement of aerospace components such as normal residual stress, no cracks, no recast layer, no porosity; still there is a need to optimize the control parameter settings and evaluate the performance characteristics of the WEDM process. The experiments have been conducted on Inconel 706 which is a newly-developed superalloy specially for aircraft application. A hybrid approach has been used to optimize the material removal rate (MRR) as well as surface roughness (SR) and significant control parameters have been identified using analysis of variance (ANOVA). Microstructure analysis revealed the formation of microglobules, melted debris and microholes on the machined surface, but no microcrack was detected due to the high toughness of the alloy. Energy dispersive X-ray spectroscopy (EDAX) has been carried out to study the metallurgical changes in the WED machined surface. The topography analysis of the curved surface revealed the best surface quality of the machined component at low pulse on time and high pulse off time. A thick recast layer of 39.6 µm was observed at high pulse on time and low servo voltage. Microhardness of the machined surface was changed up to a depth of 70 µm due to cyclic thermal loading during the WEDM process.

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References

  1. Campbell FC (2006) Manufacturing technology for aerospace structural materials. Elsevier

  2. Pollock TM, Tin S (2006) Nickel-based superalloys for advanced turbine engines: chemistry, microstructure and properties. J Propuls Power 22(2):361–374

    Article  CAS  Google Scholar 

  3. Choudhury IA, El-Baradie MA (1998) Machinability of nickel-base super alloys: a general review. J Mater Process Technol 77(1):278–284

    Article  Google Scholar 

  4. Klocke F, Welling D, Klink A, Veselovac D, Nöthe T, Perez R (2014) Evaluation of advanced wire-EDM capabilities for the manufacture of fir tree slots in Inconel 718. Procedia CIRP 14:430–435

    Article  Google Scholar 

  5. Li L, Wei XT, Li ZY (2014) Surface integrity evolution and machining efficiency analysis of W-EDM of nickel-based alloy. Appl Surf Sci 313:138–143

    Article  CAS  Google Scholar 

  6. Aspinwall DK, Soo SL, Berrisford AE, Walder G (2008) Workpiece surface roughness and integrity after WEDM of Ti–6Al–4V and Inconel 718 using minimum damage generator technology. CIRP Ann Manuf Technol 57(1):187–190

    Article  Google Scholar 

  7. Antar MT, Soo SL, Aspinwall DK, Sage C, Cuttell M, Perez R, Winn AJ (2012) Fatigue response of Udimet 720 following minimum damage wire electrical discharge machining. Mater Des 42:295–300

    Article  CAS  Google Scholar 

  8. Li L, Guo YB, Wei XT, Li W (2013) Surface integrity characteristics in wire-EDM of Inconel 718 at different discharge energy. Procedia CIRP 6:220–225

    Article  CAS  Google Scholar 

  9. Antar MT, Soo SL, Aspinwall DK, Jones D, Perez R (2011) Productivity and workpiece surface integrity when WEDM aerospace alloys using coated wires. Procedia Engineering 19:3–8

    Article  CAS  Google Scholar 

  10. Newton TR, Melkote SN, Watkins TR, Trejo RM, Reister L (2009) Investigation of the effect of process parameters on the formation and characteristics of recast layer in wire-EDM of Inconel 718. Mater Sci Eng A 513:208–215

    Article  Google Scholar 

  11. Sharma P, Chakradhar D, Narendranath S (2015) Evaluation of WEDM performance characteristics of Inconel 706 for turbine disk application. Mater Des 88:558–566. doi:10.1016/j.matdes.2015.09.036

    Article  CAS  Google Scholar 

  12. Hewidy MS, El-Taweel TA, El-Safty MF (2005) Modelling the machining parameters of wire electrical discharge machining of Inconel 601 using RSM. J Mater Process Technol 169(2):328–336

    Article  CAS  Google Scholar 

  13. Ramakrishnan R, Karunamoorthy L (2008) Modeling and multi-response optimization of Inconel 718 on machining of CNC WEDM process. J Mater Process Technol 207(1):343–349

    Article  CAS  Google Scholar 

  14. Jangra K, Grover S, Aggarwal A (2011) Simultaneous optimization of material removal rate and surface roughness for WEDM of WC-Co composite using grey relational analysis along with Taguchi method. Int J Ind Eng Comput 2(3):479–490

    Google Scholar 

  15. Das MK, Kumar K, Barman TK, Sahoo P (2013) Optimization of surface roughness and MRR in EDM using WPCA. Procedia Eng 64:446–455

    Article  Google Scholar 

  16. Technical bulletin: Inconel alloy 706 (Publication number SMC-091), Special Metals Corporation. Retrieved from (http://www.specialmetals.com/assets/documents/alloys/inconel/inconel-alloy-706.pdf)

  17. Sines G, Carlson R (1952) Hardness measurement for determination of residual stress. Bull Amer Soc Testing Mater 180:35–37

    Google Scholar 

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Acknowledgments

This work is partially supported by the Department of Science and Technology (DST), Government of India under the project reference number SB/S3/MMER/0067/2013. The authors would like to thank the DST for its funding support.

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Authors and Affiliations

  1. Department of Mechanical Engineering, National Institute of Technology Karnataka, Surathkal, 575025, India

    Priyaranjan Sharma, D. Chakradhar & Narendranath S.

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  1. Priyaranjan Sharma
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  2. D. Chakradhar
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  3. Narendranath S.
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Correspondence to Priyaranjan Sharma.

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Sharma, P., Chakradhar, D. & S., N. Analysis and Optimization of WEDM Performance Characteristics of Inconel 706 for Aerospace Application. Silicon 10, 921–930 (2018). https://doi.org/10.1007/s12633-017-9549-6

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  • DOI: https://doi.org/10.1007/s12633-017-9549-6

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