Browsing by Author "Pinter, Zsolt"

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    Effect of the deposition strategy on Al-Cu alloy wire+ arc additive manufacture
    (SVR Publishers, 2021-04-28) Ayarkwa, Kwasi Frimpong; Pinter, Zsolt; Eimer, Eloise; Williams, Stewart; Ding, Jialuo; Suder, Wojciech
    The effect of the deposition strategy on wire + arc additive manufacture (WAAM) has been conducted for aluminium alloys. In this study, oscillation and parallel deposition strategies were considered for thicker section linear wall building. The results indicate that the deposition strategy has a significant effect on mechanical properties and hardness of the WAAM structure. Optimum ultimate tensile and yield strength were identified after post-deposition heat treatment for both strategies. From microstructure analysis, it was observed that walls produced by oscillation deposition strategy were characterised by equiaxed grains whilst parallel deposited walls were characterised by a mixed grain structure consisting of columnar and equiaxed grains. It was also observed that parallel deposited walls showed an increased number of pores as compared to walls deposited using oscillation strategy. For the studies conducted on aluminium wire + arc additive manufacture, it has been found that the deposition strategy plays an important role in the quality of walls produced
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    Interpass rolling of Ti-6Al-4V wire + arc additively manufactured features for microstructural refinement
    (Elsevier, 2018-03-05) McAndrew, Anthony R.; Alvarez Rosales, Marta; Colegrove, Paul A.; Hönnige, Jan R.; Ho, Alistair; Fayolle, Romain; Eyitayo, Kamal; Stan, Ioan; Sukrongpang, Punyawee; Crochemore, Antoine; Pinter, Zsolt
    In-process deformation methods such as rolling can be used to refine the large columnar grains that form when wire + arc additively manufacturing (WAAM) titanium alloys. Due to the laterally restrained geometry, application to thick walls and intersecting features required the development of a new ‘inverted profile’ roller. A larger radii roller increased the extent of the recrystallised area, providing a more uniform grain size, and higher loads increased the amount of refinement. Electron backscatter diffraction showed that the majority of the strain is generated toward the edges of the rolled groove, up to 3 mm below the rolled surface. These results will help facilitate future optimisation of the rolling process and industrialisation of WAAM for large-scale titanium components.
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    Manufacture of large-scale space exploration components using wire + arc additive manufacturing
    (ICAS - International Council of the Aeronautics Sciences, 2022-11-28) Diao, Chenglei; Eimer, Eloise ; Mancini, Simone; Krishnaswamy, Surya; Schwarz, Florian; Pagone, Emanuele; Ding, Jialuo; Williams, Stewart; Pinter, Zsolt; Martina, Filomeno
    Cranfield University, Thales Alenia Space and WAAM3D together, combining their expertise knowledge and technologies on Wire + arc additive manufacture (WAAM), created a route for manufacturing large-scale space exploration Components using WAAM which could be used in future large scale-space exploration component manufacturing. In this project, several different sections of the development of WAAM technology are applied to manufacture a large-scale space exploration component including FEA simulation, inter-layer machining and cold work, intelligent toolpath planning and sustainability calculations. WAAM proved to be a very promising technique in future large-scale component manufacturing.
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    Strain controlled fatigue behaviour of a wire + arc additive manufactured Ti-6Al-4V
    (Elsevier, 2023-02-24) Syed, Abdul Khadar; Plaskitt, Rob; Hill, Michelle; Pinter, Zsolt; Ding, Jialuo; Zboray, Robert; Williams, Stewart; Zhang, Xiang
    This paper presents the cyclic deformation behaviour and fatigue properties of a wire + arc additive manufactured Ti-6Al-4V alloy in the as built condition under strain-controlled test condition. Higher local energy input used to build the material has resulted in a coarser primary columnar β grain structure along with a coarser α microstructure compared to Ti-6Al-4V alloys produced by other additive manufacture processes. Test specimens were manufactured in horizontal and vertical orientations with respect to the deposited layers. Isotropic fatigue property was observed at lower applied strain values. When the strain amplitude was above 0.6%, the vertical samples, where the loading axis was parallel with the primary columnar β grains, showed marginally higher fatigue life owing to the material being more ductile in this direction. Moreover, higher cyclic softening rate by a factor of two was measured in the vertical samples. No porosity defects were found in the material. Cracks were initiated from either the α laths or α/β interface due to cyclic slip localisation.