Identification of Subsurface Deformation in Machining of Inconel 718

Abstract:

There is considerable industrial significance to understand the nature of subsurface deformation under the machined surface for correct prediction of surface properties in machined components based upon the machined conditions and material behaviors that give rise to them. In this study, high speed machining of Inconel 718 was carried with whisker reinforced ceramic cutting tool under different conditions of tool wear, coolant state and cutting parameters. The objective of the present investigation was to determine the effect of both cutting parameters and tool wear on the plastic deformation in the subsurface region of Inconel 718 after the finishing machining with above process conditions. The surface and subsurface region of machined specimens were examined using a high resolution scan electron microscope (HRSEM) and EBSD technique, microhardness measurements were also conducted on the test samples, accordingly plastic strain analysis were carried out.

• Periodical: Applied Mechanics and Materials (Volumes 117-119)
• Pages: 1681-1688
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.117-119.1681
• Online since: October 2011
• Authors: Jin Ming Zhou, Volodymr Bushlya, Ru Lin Peng, Jan Eric Stahl
• Keywords: Ceramic, Deformation, Inconel 718, Nickel Alloy, Surface Integrity

References

[1] Jahanmir, S. and N. P. Suh (1977) Surface topography and integrity effects on sliding wear, J. Wear, 44, pp.87-99.

DOI: 10.1016/0043-1648(77)90087-4

[2] Sundaraman, M., L. Kumar and S. Banerjee, (2001) Characterization of deformation microstructure beneath machined surface and its role in the dimensional stability of Inconel 718. In E. A. Loria, editor, SuperInconel 718, 625, 706 and Various Derivatives, pp.709-718, Warrendale.

DOI: 10.7449/2001/superalloys_2001_709_719

[3] Shankar, M. R, R. S. Lee, S. Chandraseker, A. H. King and W. D. Compton (2006) Severe plastic deformation (SPD) of titanium at near ambient temperature, Acta, Material, 54(14), pp.3691-700.

DOI: 10.1016/j.actamat.2006.03.056

[4] Shankar, M. R, R. S. Lee, S. Chandraseker, A. H. King and W. D. Compton (2006) Severe plastic deformation by machining characterized by finite element simulation, Metallurgical and Materials Transactions B, 37A, pp.1633-43.

[5] Xie, Q., A. E. Bayoumi and L. A. Kendall (1990) On tool wear and its effect on machined surface integrity, Journal of Material Shaping Technology, 8, pp.255-265.

DOI: 10.1007/bf02833822

[6] Saoubi, R. M. and L. Ryde (2005) Application of the EBSD technique for the characterisation of deformation zones in metal cutting. Journal of Materials Science and Engineering A, 405, pp.339-349.

DOI: 10.1016/j.msea.2005.06.002

[7] El-Wardany, T. I., Mohammed E. and Elbestawi, M. A., (1996) Cutting temperature of ceramic tools in high speed machining of difficult-to-cut materials. International Journal of Machine Tool and Manufacturing, 36(5), pp.611-634

DOI: 10.1016/0890-6955(95)00043-7

[8] Kitagawa, T., Kubo, A. and Maekawa, K. (1996) Temperature and wear of cutting tools in high-speed machining of Inconel 718 and Ti-6Al-6V-2Sn, Journal of Wear, 202, pp.142-148.

DOI: 10.1016/s0043-1648(96)07255-9

[9] Jeelani, S and K. Ramakrishnan (1983), Subsurface plastic deformation in machining 6Al-2Sn-4Zr-2Mo titanium alloy, Journal of Wear, 85, pp.121-130.

DOI: 10.1016/0043-1648(83)90340-x

[10] Jeelani, S and K. Ramakrishnan (1982), Subsurface plastic deformation in machining annealed 18% ni maraging steel, Journal of Wear, 81, pp.263-273

DOI: 10.1016/0043-1648(82)90275-7

[11] Sadat, A. B. and M. Y. Reddy (1992) Surface integrity of Inconel-718 nickel-base superalloy using controlled and natural contact length tools. Part1: Lubricated, Journal of Experimental Mechanics, 32(3), pp.282-288.

DOI: 10.1007/bf02319367

[12] Dupont, F., C. A. Brown and B. Ilschner (1988), Microstructure and microhardness in the superficial layer deformed by machining 7075 aluminium alloy. Journal of metalwork, 79(2), pp.74-80.

DOI: 10.1515/ijmr-1988-790202

[13] Dargusch, M. S., M. X. Zhang, S. Palanisam, A. J. Buddery, D. H. StJohn (2008) Subsurface Deformation After Dry Machining of Grade 2 Titanium, Advanced Engineering Materials, 10(1-2), pp.85-88.

DOI: 10.1002/adem.200700233

[14] Sadat, A. B. and M. Y. Reddy (1993) Surface integrity of Inconel-718 nickel-base superalloy using controlled and natural contact length tools. Part2: unlubricated, Journal of Experimental Mechanics, 33(4), pp.343-348.

DOI: 10.1007/bf02322151

[15] Sadat, A. B., M. Reddy and B. P. Wang (1991) Plastic deformation analysis in machining of Inconel-718 nickel-base superalloy using both experimental and numerical methods. International Journal of Mechanical Science, 33(10), pp.829-842.

DOI: 10.1016/0020-7403(91)90005-n

[16] Sharman, A R. C., J. I. Hughes and K. Ridgway (2006) An analysis of the residual stress generated in Inconel 718 when turning. Journal of Material Processing, 173, pp.359-367.

DOI: 10.1016/j.jmatprotec.2005.12.007

[17] Chou, Y. K. (2002) Surface hardening of AISI 4340 steel by machining: a preliminary investigation, Journal of Material Processing Technology, 124, pp.171-177.

DOI: 10.1016/s0924-0136(02)00132-2

[18] Liu, C.R. and M. M. Barash (1976) The mechanical state of the sublayer of a surface generated by chip-removal process, Transaction of ASME, Journal of Industrial Engineering, pp.1192-99.