Investigation of Post-weld Heat Treatment of Laser Welded Ti6Al4V Materials

Year 2023, Volume: 12 Issue: 2, 501 - 507, 27.06.2023

Kadir Aydın , Mustafa Karamolla

https://doi.org/10.17798/bitlisfen.1251165

Abstract

In this study, the changes in the internal structure and mechanical properties of laser-welded Ti6Al4V material after heat treatment were experimentally investigated. The transformation temperatures of the α and β phase structures of the Ti6Al4V material influenced the heat treatment temperatures. Optical microscopes, XRD, and SEM experiments were performed to detect the microstructural change. Hardness and tensile tests were also carried out to determine the change in mechanical properties. The experimental study determined that the mechanical properties of laser-welded Ti6Al4V material improved after heat treatment. It was observed that ductility and strength increased significantly at heat treatment temperatures above the β phase temperature. It was determined that the Widmanstatten morphology visible in the weld area increased the hardness.

Keywords

Laser welding, Ti6Al4V, Heat treatment

Supporting Institution

Manisa Celal Bayar Üniversitesi BAP Birimi

Project Number

2020-047

Thanks

The authors thank Manisa Celal Bayar University for financial support (BAP project number 2020/47).

References

• [1] N. K. Park, C. H. Lee, J. H. Kim, and J. K. Hong, “Characteristics of powder-rolled and sintered sheets made from HDH Ti powders,” Key Eng. Mater., vol. 520, pp. 281–288, 2012.
• [2] X. Xu, G. L. Nash, and P. Nash, “Sintering mechanisms of blended Ti6Al4V powder from diffusion path analysis,” J. Mater. Sci., vol. 49, no. 3, pp. 994–1008, 2014.
• [3] V. A. R. Henriques, H. R. Z. Sandim, G. C. Coelho, and C. R. M. da Silva, “Microstructural evolution during hot pressing of the blended elemental Ti–6%Al–7%Nb alloy,” Mater. Sci. Eng. A Struct. Mater., vol. 347, no. 1–2, pp. 315–324, 2003.
• [4] V. A. Joshi, Titanium alloys: An atlas of structures and fracture features. Boca Raton, FL: CRC Press, 2006.
• [5] K. Aydin and İ. Karaağaç, “Lazer kaynağı ve lazer kaynağının başlıca uygulamaları,” El-Cezeri Fen ve Mühendis. Derg., vol. 5, no. 2, pp. 693–705, 2018.
• [6] N. Kashaev, V. Ventzke, V. Fomichev, F. Fomin, and S. Riekehr, “Effect of Nd:YAG laser beam welding on weld morphology and mechanical properties of Ti–6Al–4V butt joints and T-joints,” Opt. Lasers Eng., vol. 86, pp. 172–180, 2016.
• [7] P.-Q. Xu, L. Li, and C. (sam) Zhang, “Microstructure characterization of laser welded Ti-6Al-4V fusion zones,” Mater. Charact., vol. 87, pp. 179–185, 2014.
• [8] E. Akman, A. Demir, T. Canel, and T. Sınmazçelik, “Laser welding of Ti6Al4V titanium alloys,” J. Mater. Process. Technol., vol. 209, no. 8, pp. 3705–3713, 2009.
• [9] “TİTANYUM (GRADE 1) - IATS’09 - Karabük Üniversitesi,” yumpu.com. [Online]. Available: https://www.yumpu.com/tr/document/view/2032910/titanyum-grade-1-iats09-karabuk-universitesi. [Accessed: 14-Feb-2023].
• [10] C. Köse and E. Karaca, “Nd:YAG lazer kaynağı ile birleştirilen Ti6Al4V alaşımının mikroyapı ve mekanik özelliklerine ısıl işlemlerin etkileri,” Balıkesir Üniv. Fen Bilim. Enst. derg., vol. 21, no. 1, pp. 232–243, 2019.
• [11] C. Köse and E. Karaca, “Ti6Al4V alaşiminin fiber lazer kaynak kabiliyeti,” NWSA-Eng. Sci., vol. 12, no. 3, pp. 140–152, 2017.
• [12] P. Fu, Z. Mao, C. Zuo, Y. Wang, and C. Wang, “Microstructures and fatigue properties of electron beam welds with beam oscillation for heavy section TC4-DT alloy,” Chin. J. Aeronaut., vol. 27, no. 4, pp. 1015–1021, 2014.
• [13] S. H. Wang, M. D. Wei, and L. W. Tsay, “Tensile properties of LBW welds in Ti–6Al–4V alloy at evaluated temperatures below 450 °C,” Mater. Lett., vol. 57, no. 12, pp. 1815–1823, 2003.
• [14] A. S. H. Kabir et al., “Effect of postweld heat treatment on microstructure, hardness, and tensile properties of laser-welded ti-6Al-4V,” Metall. Mater. Trans. A, vol. 43, no. 11, pp. 4171–4184, 2012.