The Effect of Preferential Growth on the Microstructure and Electrochemical Properties of CoCrW Alloys Produced by Selective Laser Melting

Abstract

In this study, the effect of microstructural changes in CoCrW alloys produced by Selective Laser Melting (SLM) on their electrochemical properties was investigated. Phase analysis revealed that the microstructure of the SLM-fabricated CoCrW alloy was predominantly composed of the γ-fcc phase, along with a minor amount of the ε-hcp phase. Corrosion tests were performed in simulated body fluid (SBF) solution in order to mimic physiological conditions. According to the electrochemical test results, the samples fabricated at a lower production angle of 0° have exhibited higher corrosion resistance compared to the samples produced at a higher production angle of 90°. This behavior was attributed to the higher thermal energy input during fabrication and the steep thermal gradient around the melt pool, which were considered to promote larger grain formation at lower production angles.

Keywords

• CoCrW alloys
• Selective laser melting
• Implants
• Prostheses
• Corrosion

Ethical Statement

Ethics committee approval was not required for this study because of there was no study on animals or humans.

References

1. Aslan, M., Çomakli, O., Yazici, M., Yetim, A., Bayrak, Ö., & Çelik, A. (2018). The effect of plasma oxidation and nitridation on corrosion behavior of CoCrMo alloy in SBF solution. Surface Review and Letters, 25(8), Article 1950024.
2. Cai, H., Li, X., Zhang, Y., Yang, C., Cui, S., Sheng, L., Jiang, H., & Chu, P. K. (2023). A high corrosion-resistant waterborne epoxy resin coating improved by addition of multi-interface structured zinc phosphate particles. Journal of Materials Research and Technology, 26, 7829–7844.
3. Choi, Y.-J., Koak, J.-Y., Heo, S.-J., Kim, S.-K., Ahn, J.-S., & Park, D.-S. (2014). Comparison of the mechanical properties and microstructures of fractured surface for Co-Cr alloy fabricated by conventional cast, 3-D printing laser-sintered and CAD/CAM milled techniques. The Journal of Korean Academy of Prosthodontics, 52(2), 67–73.
4. Çomakli, O., Yazici, M., Yetim, T., Yetim, A. F., & Çelik, A. (2017). The effects of aging time on the structural and electrochemical properties of composite coatings on CP-Ti substrate. Journal of Bionic Engineering, 14(3), 532–539.
5. Dai, N., Zhang, J., Chen, Y., & Zhang, L.-C. (2017). Heat treatment degrading the corrosion resistance of selective laser melted Ti-6Al-4V alloy. Journal of The Electrochemical Society, 164(7), C428–C434.
6. Hedberg, Y. S., Qian, B., Shen, Z., Virtanen, S., & Wallinder, I. O. (2014). In vitro biocompatibility of CoCrMo dental alloys fabricated by selective laser melting. Dental Materials, 30(5), 525–534.
7. Herzog, D., Seyda, V., Wycisk, E., & Emmelmann, C. (2016). Additive manufacturing of metals. Acta Materialia, 117, 371–392.
8. Kajima, Y., Takaichi, A., Kittikundecha, N., Nakamoto, T., Kimura, T., Nomura, N., Tsutsumi, Y., Hanawa, T., & Wakabayashi, N. (2018). Effect of heat-treatment temperature on microstructures and mechanical properties of Co–Cr–Mo alloys fabricated by selective laser melting. Materials Science and Engineering: A, 726, 21–31.

9. Kokubo, T. (1996). Formation of biologically active bone-like apatite on metals and polymers by a biomimetic process. Thermochimica Acta, 280, 479-490.
10. Koutsoukis, T., Zinelis, S., Eliades, G., Al-Wazzan, K., Rifaiy, M. A., & Al Jabbari, Y. S. (2015). Selective laser melting technique of Co-Cr dental alloys: A review of structure and properties and comparative analysis with other available techniques. Journal of Prosthodontics, 24(4), 303–312.
11. Lee, H. W., Jung, K.-H., Hwang, S.-K., Kang, S.-H., & Kim, D.-K. (2019). Microstructure and mechanical anisotropy of CoCrW alloy processed by selective laser melting. Materials Science and Engineering: A, 749, 65–73.
12. Lu, Y., Gan, Y., Lin, J., Guo, S., Wu, S., & Lin, J. (2017). Effect of laser speeds on the mechanical property and corrosion resistance of CoCrW alloy fabricated by SLM. Rapid Prototyping Journal, 23(1), 28–33.
13. Lu, Y., Guo, S., Yang, Y., Liu, Y., Zhou, Y., Wu, S., Zhao, C., & Lin, J. (2018a). Effect of thermal treatment and fluoride ions on the electrochemical corrosion behavior of selective laser melted CoCrW alloy. Journal of Alloys and Compounds, 730, 552–562.
14. Lu, Y., Ren, L., Xu, X., Yang, Y., Wu, S., Luo, J., Lin, J., & Yang, K. (2018b). Effect of Cu on microstructure, mechanical properties, corrosion resistance and cytotoxicity of CoCrW alloy fabricated by selective laser melting. Journal of the Mechanical Behavior of Biomedical Materials, 81, 130–141.
15. Lu, Y., Wu, S., Gan, Y., Li, J., Zhao, C., Zhuo, D., & Lin, J. (2015). Investigation on the microstructure, mechanical property and corrosion behavior of the selective laser melted CoCrW alloy for dental application. Materials Science and Engineering: C, 49, 517–525.
16. Lu, Y., Wu, S., Gan, Y., Zhang, S., Guo, S., Lin, J., & Lin, J. (2016). Microstructure, mechanical property and metal release of as-SLM CoCrW alloy under different solution treatment conditions. Journal of the Mechanical Behavior of Biomedical Materials, 55, 179–190.
17. Lu, Y., Zhao, C., Ren, L., Guo, S., Gan, Y., Yang, C., Wu, S., Lin, J., & Yang, K. (2016). Preliminary assessment of metal-porcelain bonding strength of CoCrW alloy after 3 wt.% Cu addition. Materials Science and Engineering: C, 63, 37–45.
18. Luo, J., Wu, S., Lu, Y., Guo, S., Yang, Y., Zhao, C., Lin, J., & Lin, J. (2018). The effect of 3 wt.% Cu addition on the microstructure, tribological property and corrosion resistance of CoCrW alloys fabricated by selective laser melting. Journal of Materials Science: Materials in Medicine, 29(4), Article 37.
19. Qian, B., Saeidi, K., Kvetková, L., Lofaj, F., Xiao, C., & Shen, Z. (2015). Defects-tolerant Co-Cr-Mo dental alloys prepared by selective laser melting. Dental Materials, 31(12), 1435–1444.
20. Rickenbacher, L., Etter, T., Hövel, S., & Wegener, K. (2013). High temperature material properties of IN738LC processed by selective laser melting (SLM) technology. Rapid Prototyping Journal, 19(4), 282–290.
21. Seki, E., Kajima, Y., Takaichi, A., Kittikundecha, N., Cho, H. H. W., Htat, H. L., Yonehara, Y., Nomura, N., & Wakabayashi, N. (2019). Effect of heat treatment on the microstructure and fatigue strength of CoCrMo alloys fabricated by selective laser melting. Materials Letters, 245, 53–56.
22. Spotorno, R., Ghiara, G., Latronico, G., Carlini, R., Mele, P., & Artini, C. (2020). Corrosion of the filled skutterudite Sm0.1(Fe0.45Ni0.55)4Sb12 by NaCl solutions: An electrochemical study. Journal of Electronic Materials, 49(5), 2872–2880.
23. Thijs, L., Kempen, K., Kruth, J.-P., & Van Humbeeck, J. (2013). Fine-structured aluminium products with controllable texture by selective laser melting of pre-alloyed AlSi10Mg powder. Acta Materialia, 61(5), 1809–1819.
24. Wang, H., Akid, R., & Gobara, M. (2010). Scratch-resistant anticorrosion sol–gel coating for the protection of AZ31 magnesium alloy via a low temperature sol–gel route. Corrosion Science, 52(8), 2565–2570.
25. Wauthle, R., Vrancken, B., Beynaerts, B., Jorissen, K., Schrooten, J., Kruth, J.-P., & Van Humbeeck, J. (2015). Effects of build orientation and heat treatment on the microstructure and mechanical properties of selective laser melted Ti6Al4V lattice structures. Additive Manufacturing, 5, 77–84.
26. Yazici, M., Çomakli, O., Yetim, T., Yetim, A., & Çelik, A. (2015). The effect of plasma nitriding temperature on the electrochemical and semiconducting properties of thin passive films formed on 316 L stainless steel implant material in SBF solution. Surface & Coatings Technology, 261, 181–188.
27. Zhou, X., Li, K., Zhang, D., Liu, X., Ma, J., Liu, W., & Shen, Z. (2015). Textures formed in a CoCrMo alloy by selective laser melting. Journal of Alloys and Compounds, 631, 153–164.
28. Zou, S., Zhao, Z., Xu, W., Ni, X., Zhang, L., Wu, W., ... Dong, C. (2022). Effects of scanning speeds on the wear behavior of CoCrW alloy fabricated by selective laser melting. Optics & Laser Technology, 147, Article 107652.