Abstract
In spite of the rapid development of additive manufacturing technology, the industry has a demand for large parts and the most common processes, such as Selective Laser Melting or Laser Cladding, cannot satisfy this demand. In this regard, Wire-Arc Additive Manufacturing (WAAM) enables to produce large components, such as those finding application in the aerospace industry. However, WAAM processes usually cause high residual stresses due to high deposition rates and excessive heat input. In addition, the mechanical properties of the clad metal are significantly affected by porosity and poor microstructure. In-process work hardening, such as surface work hardening through highly dynamic impacts (also known as forging), can help refine the structure, lower the porosity and residual stresses thus benefiting the properties of clad metal. This paper describes an experimental study that looked at the mechanical properties of aluminium specimens produced by multilayer surfacing in different temperature cycles with or without forging. The results of the mechanical tests are also presented. It was found that forging had an impact on the mechanical properties of the aluminum alloy 5056 specimens.
Keywords
Additive manufacturing, multilayer surfacing, cold metal transfer, CMT, aluminium, aluminum alloy 5056, work hardening, impact, mechanical properties, tensile properties, toughness, wire arc additive manufacturing, WAAM, arc welding.
1. Wu Bintao; Pan Zengxi; Ding Donghong; Cuiuri Dominic; Li Huijun; Xu Jing; Norrish John, A review of the wire arc additive manufacturing of metals: properties, defects and quality improvement, JOURNAL OF MANUFACTURING PROCESSES 35, 2018, pp. 127–139.
2. Donghong Ding, Zengxi Pan *, Stephen van Duin, Huijun Li and Chen Shen. Fabricating Superior NiAl Bronze Components through Wire Arc Additive Manufacturing. Materials 2016, 9, 652.
3. Iván Tabernero, Amagoia Paskual, Pedro Álvarez, Alfredo Suárez. Study on Arc Welding processes for High Deposition Rate Additive Manufacturing. 19th CIRP Conference on Electro Physical and Chemical Machining, 23–27 April 2018, Bilbao, Spain. Eng. 68, 2018, pp. 358–362.
4. Lockett, Helen; Ding, Jialuo; Williams, Stewart and Martina, Filomeno (2017). Design for Wire + Arc Additive Manufacture: design rules and build orientation selection. Journal of Engineering Design, 28(7-9) pp. 568–598.
5. E.M. Ryan, T.J. Sabin, J.F. Watts, M.J. Whiting. The influence of build parameters and wire batch on porosity of wire and arc additive manufactured aluminium alloy 2319. Journal of Materials Processing Technology. 262, 2018, pp. 577–584.
6. Zeqi Hu, Xunpeng Qin, Tan Shao. Welding Thermal Simulation and Metallurgical Characteristics Analysis in WAAM for 5CrNiMo Hot Forging Die. International Conference on the Technology of Plasticity, ICTP 2017, 17–22 September 2017, Cambridge, United Kingdom, vol 207, 2017, pp 2203–2208.
7. J Bai et al. Porosity evolution in additively manufactured aluminium alloy during high temperature exposure. 2017 IOP Conference Series: Materials Science and Engineering. 167 012045.
8. Markus Hirtler, Angelika Jedynak, Benjamin Sydow, Alexander Sviridov, and Markus Bambach. Investigation of microstructure and hardness of a rib geometry produced by metal forming and wire-arc additive manufacturing. MATEC Web of Conferences 190, 02005, 2018, ICNFT 2018.
9. Zhizhuang Hao, Sansan Ao, Yangchuan Cai, Wei Zhang and Zhen Luo. Formation of SUS304/Aluminum Alloys Using Wire and Arc Additive Manufacturing. Metals 2018, 8, 595.
10. Z D Ni, B L Dong, S B Lin, C L Yang, C L Fan, J X Shi. Numerical Analysis on Stress Evolution During GTA-Additive Manufacturing of Thin-Walled Aluminum Alloys. IOP Conference Series: Journal of Physics: Conference Series 1063, 2018 012083.
11. Qianru Wu, Jiping Lu, Changmeng Liu *, Hongli Fan, Xuezhi Shi, Jie Fu and Shuyuan Ma. Effect of Molten Pool Size on Microstructure and Tensile Properties of Wire Arc Additive Manufacturing of Ti-6Al-4V Alloy. Materials 2017, 10, 749.
12. Anthony R. McAndrew, Marta Alvarez Rosales, Paul A. Colegrove, Jan R. Hönnige, Alistair Ho, Romain Fayolle, Kamal Eyitayo, Ioan Stan, Punyawee Sukrongpang, Antoine Crochemore, Zsolt Pinter. Interpass rolling of Ti-6Al-4V wire+arc additively manufactured features for microstructural refinement. Additive Manufacturing 21, 2018, 340–349.
13. J. Donoghue, A.A. Antonysamy, F. Martina, P.A. Colegrove, S.W. Williams, P.B. Prangnell. The effectiveness of combining rolling deformation with Wire–Arc Additive Manufacture on β-grain refinement and texture modification in Ti–6Al–4V. Materials Characterization, 2016, vol. 114, pp. 103–114.
14. Sapozhnikov S.B., Zagrebelnyi S.S., Shakirov A.A. Relaxation of welding stresses through severe plastic deformation. Vestnik Yuzhno-Uralskogo gosudarstvennogo universiteta. Seriya: Mashinostroenie [Bulletin of the South Ural State University. Series: Mechanical Engineering Industry], 2013, no. 13 (2), pp. 81–86. (In Russ.)
15. Baoqiang Cong, Zewu Qi, Bojin Qi, Hongye Sun, Gang Zhao and Jialuo Ding. A Comparative Study of Additively Manufactured Thin Wall and Block Structure with Al-6.3%Cu Alloy Using Cold Metal Transfer Process. Applied Sciences. 2017, 7, 275.
16. Jie Fu, Kun Qiu, Lin Gong, Changmeng Liu, Qianru Wu, Jiping Lu, Hongli Fan. Effect of Tool-Path on Morphology and Mechanical Properties of Ti-6Al-4V Fabricated by Wire and Arc Additive Manufacturing. MATEC Web of Conferences 128, 05009, 2017, EITCE 2017.
17. X Zhang, F Martina, J Ding, X Wang and SW Williams. Fracture toughness and fatigue crack growth rate properties in wire+arc additive manufactured Ti-6Al-4V. Fatigue & Fracture of Engineering Materials & Structures, 2017, 40, 790–803.