Mechanical properties enhancement of additive manufactured Ti-6Al-4V by machine hammer peening

Show simple item record Williams, Stewart W. Ding, Jialuo Hönnige, Jan Martina, Filomeno Neto, Leonor 2019-09-23T16:29:36Z 2019-09-23T16:29:36Z 2019-07-31
dc.identifier.citation Neto L, Williams S, Ding J, Hönnige J & Martina F (2020) Mechanical properties enhancement of additive manufactured Ti-6Al-4V by machine hammer peening. In: Itoh, S., Shukla, S. (eds) Advanced Surface Enhancement: Proceedings of the 1st International Conference on Advanced Surface Enhancement (INCASE 2019) - Research Towards Industrialisation, Springer Link, pp. 121-132 en_UK
dc.identifier.isbn 978-981-15-0053-4
dc.description.abstract Wire + Arc Additive Manufacturing (WAAM) is a technology potentially offering reduction of material wastage, costs and shorter lead-times. It is being considered as a technology that could replace conventional manufacturing processes of Ti-6Al-4V, such as machining from wrought or forged materials. However, WAAM Ti-6Al-4V is characterized by coarse β-grains, which can extend through several deposited layers resulting in strong texture and anisotropy. As a solution, inter-pass cold rolling has been proven to promote grain refinement, texture modification and improvement of material strength by plastically deforming the material between each deposited layer. Nevertheless, with the increased interest in the WAAM technology, the complexity and size of the deposited parts has increased, and its application can be hindered by the low speed and complex/costly equipment required to perform rolling at this scale. Therefore, Machine Hammer Peening (MHP) has been studied as an alternative cold work process. MHP can be used robotically, offering greater flexibility and speed, and it can be applied easily to any large-scale geometry. Similarly to rolling, MHP is applied between each deposited layer with the new ECOROLL peening machine and, consequently, it is possible to eliminate texturing and reduce the β-grains size from centimeters long to approximately 1 to 2 mm. This effect is studied for thin and thick walls and no considerable change in grain size is observed, proving the applicability of MHP to large components. The yield strength and ultimate tensile strength increases to 907 MPa and 993 MPa, respectively, while still having excellent ductility. This grain refinement may also improve fatigue life and induce a decrease in crack propagation rate. In this study, it has been shown that MHP is a suitable process for WAAM Ti-6Al-4V applications, can be applied robotically and the grain refinement induced by very small plastic deformations can increase mechanical properties. en_UK
dc.language.iso en en_UK
dc.publisher Springer Link en_UK
dc.rights Attribution-NonCommercial 4.0 International *
dc.rights.uri *
dc.subject Wire plus arc additive manufacturing en_UK
dc.subject Machine hammer peening en_UK
dc.subject Titanium Grain refinement en_UK
dc.subject Mechanical properties en_UK
dc.title Mechanical properties enhancement of additive manufactured Ti-6Al-4V by machine hammer peening en_UK
dc.type Book chapter en_UK

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