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Investigation of Impact Strength, Micro Hardness and Metallurgical Analysis of DMLS Fabricated CoCrMo Alloy Samples

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Abstract

Many components in the mechanical industries fail more, due to the impact load rather than the stationary load. Essential knowledge on mechanical properties of materials is required for an engineer to develop a prototype using Direct Metal Laser Sintering (DMLS). It is an additive manufacturing technology which is extensively used for developing functional components and prototypes in mechanical, aerospace, marine and other Industries. In the present study, the material CoCrMo which is a cobalt based super alloy is sintered in vertical orientation (length in Z-direction) for testing the impact strength, micro hardness of the material by varying input parameters like laser power, scan speed and porosity, each three levels, to fabricate the standard samples. The microstructure of the fabricated samples is analysed by capturing the SEM images. The results obtained state that samples fabricated using moderate laser Power (310 W), low Scan Speed (1200 mm/s) and moderate porosity (20%) exhibit high impact strength (16 J/cm2) and the samples fabricated with moderate scan speed (1300 mm/s), high Laser power (350 W) and low porosity (10%) exhibits high micro hardness (506.37 ± 15). However, the sample surfaces doesn’t have porosity, the influence of the same is negligible on micro hardness. The reasons are discussed in detail. The experimental results indicate the suitability of DMLS fabricated CoCrMo components for different applications like bio-medical, aerospace engineering etc. where high micro hardness and impact strength are desirable.

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References

  1. Suresh, G., Narayana, K.L.: A review on fabricating procedures in rapid prototyping. Int. J. Manuf. Mater. Mech. Eng. 6(2) (2016)

  2. Suresh, G., Narayana, K.L., Mallik, M.K.: Laser engineered net shaping process in development of bio-compatible implants: An overview. J Adv Res Dyn Control Syst 9 (14) (2017)

  3. Suresh, G., Narayana, K.L., Kedar Mallik, M.: A review on development of medical implants by rapid prototyping technology. Int J Pure Appl Math 117 (21) (2017)

  4. España, F.A., Balla, V.K., Bose, S., Bandyopadhyay, A.: Design and fabrication of CoCrMo alloy based novel structures for load bearing implants using laser engineered net shaping. Mater. Sci. Eng. C. 30(1), 50–57 (2010)

  5. Kedar, M., Srinivasa, C., Kesava, V.V.S.: Effect of heat treatment on hardness of Co-Cr-Mo alloy deposited with laser engineered net shaping. Procedia Eng. 97, 1718–1723 (2014)

  6. Chimmat, M.K., Srinivasan, D.: Understanding the residual stress in DMLS CoCrMo and SS316L using X-ray diffraction. Procedia Struct. Integr. 14, 746–757 (2019)

  7. de Castro Girãoa, D, Béreš, M., Jardini, A.L., Maciel Filho, R., Silva, C.C., de Siervo, A., de Abreu, H.F.G., Araújo, W.S.: An assessment of biomedical CoCrMo alloy fabricated by direct metal laser sintering technique for implant applications. Mater. Sci. Eng. C. 107, 110305 (2020)

  8. Zangeneh, S., Lashgari, H.R., Roshani, A.: Microstructure and tribological characteristics of aged Co–28Cr–5Mo–0.3 C alloy. Mater. Des. 37, 292–303 (2012)

  9. Mantrala, K.M., Das, M., Balla, V.K., Rao, C.S., Kesava Rao, V.V.S.: Laser-deposited CoCrMo alloy: Microstructure, wear, and electrochemical properties. J Mater Res 29(17) (2014)

  10. Mallik, M.K., Rao, C.S., Kesava Rao, V.V.S., Munaf, S.A.: Effect of process parameters on the tensile properties of LENS deposited Co-Cr-Mo alloy. Int. J. Manuf. Technol. Manag. 32(6), 509–516 (2018)

  11. Mallik, M.K., Narayana, K.L.: Impact Strength and Fracture analysis of Co-Cr-Mo Alloy Deposited with Laser Engineered Net Shaping - An Additive Manufacturing Technology. World congress of Engineering, London (2019)

  12. Bang, G.B., Park, J.H., Kim, W.R., Hyun, S.-K., Park, H.-K., Lee, T.W., Kim, H.G.: Study on the effect of preheating temperature of SLM process on characteristics of CoCrMo alloy. Mater. Sci. Eng.: A. 841, 143020 (2022)

  13. Li, C., Fang, X.Y., Guo, Y.B.: Residual stress in metal additive manufacturing. Proc. CIRP. 71, 348–353 (2018)

  14. Sharma, N.K.M.R., Kumar, N., Kumar, A., Anand, P., Rai, P., Singh, H.: An overview of investigation of fatigue, tensile strength and hardness of the components fabricated through direct metal laser sintering (DMLS) process. Mater Sci Mater Today Proc 47(13), 3979–3984 (2021)

  15. Nayak, P.K., Sahu, A.K., Mahapatra, S.S.: Effect of process parameters on the mechanical behaviour of FDM and DMLS build parts. Mater. Today: Proc. 22, 1443–1451 (2020)

  16. Rashid, R., Ruan, D., Palanisamy, S., Elambasseril, J., Brandt, M.: Effect of energy per layer on the anisotropy of selective laser melted AlSi12 aluminium alloy. Addit. Manuf. 22, 426–439 (2018)

  17. Narayana, K.L., Suresh, G., Mallik, M.K.: Hardness, wear and corrosion properties of Co-Cr-W alloy deposited with laser engineered net shaping in medical applications. Int. J. Innov. Technol. Exploring Eng. 8(8), 2951–2955 (2019)

  18. Oksiuta, Z., Dabrowski, J.R., Ratuszek, W.: Structure of porous samples of Co-Cr-Mo alloy. Arch. Metall. Mater. 49(4), 949–960 (2004)

  19. Nová, K., Novák, P., Dvorskỳ, D., Zỳka, J.: Mechanical properties of Co-Cr-Mo alloy in dependence in the composition and production. Manuf. Technol. 16(6), 1336–1340 (2016)

  20. Rashid, R.R., Palanisamy, S., Attar, H., Bermingham, M., Dargusch, M.S.: Metallurgical features of direct laser-deposited Ti6Al4V with trace boron. J. Manuf. Process. 35, 651–656

  21. Rashid, R.R., Wang, G., Sun, S., Wang, G., Dargusch, M.S.: The effect of laser power on the machinability of the Ti-6Cr-5Mo-5V-4Al beta titanium alloy during laser assisted machining. Int J Mach Tools Manuf 63, 41–43

  22. Mistry, S., et al: Investigations on density and surface roughness characteristics during selective laser sintering of Invar-36 alloy. Mater Res Express 6(8) 086541

  23. Khanna, N., Zadafiya, K., Patel, T., Kaynak, Y., Rashid, R.A.R., Vafadar, A.: Review on machining of additively manufactured nickel and titanium alloys. J Mater Res Technol 15, 3192–3221 (2021)

  24. Bawane, K.K., Srinivasan, D., Banerjee, D.: Microstructural evolution and mechanical properties of Direct Metal Laser-Sintered (DMLS) CoCrMo after heat treatment. Metall. Mater. Trans. 49, 3793–3811 (2018)

  25. Froes, F.H., Dutta, B.: The Additive Manufacturing (AM) of titanium alloys. Adv. Mater. Res. 1019, 19–25 (2014)

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Authors and Affiliations

  1. Department of Manufacturing Engineering, Annamalai University, 608002, Chidambaram, Tamil Nadu, India

    D. V. Seshagirirao & S. Raju

  2. Department of Mechanical Engineering, Vasireddy Venkatadri Institute of Technology, Guntur Dist, Nambur, A.P, 522508, India

    D. V. Seshagirirao & Kedar Mallik Mantrala

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  1. D. V. Seshagirirao
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  2. S. Raju
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  3. Kedar Mallik Mantrala
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Contributions

1. D. V. Seshagirirao: Preparation of Manuscript, figures and Table.

2. Dr. S. Raju: Review of the article.

3. Dr. M. Kedar Mallik: Preparation of Manuscript, figures and tables.

Corresponding author

Correspondence to Kedar Mallik Mantrala.

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Seshagirirao, D.V., Raju, S. & Mantrala, K.M. Investigation of Impact Strength, Micro Hardness and Metallurgical Analysis of DMLS Fabricated CoCrMo Alloy Samples. Lasers Manuf. Mater. Process. 10, 19–31 (2023). https://doi.org/10.1007/s40516-022-00195-1

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  • DOI: https://doi.org/10.1007/s40516-022-00195-1

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