The effectiveness of combining rolling deformation with Wire–Arc Additive Manufacture on β-grain refinement and texture modification in Ti–6Al–4V

By J. Donoghue, A. Antonysamy, Filomeno Martina, Paul A. Colegrove, Stewart W. Williams, P. Prangnell. 2016

313 citations recorded by the source corpus.

Abstract In Additive Manufacture (AM), with the widely used titanium alloy Ti–6Al–4V, the solidification conditions typically result in undesirable, coarse-columnar, primary β grain structures. This can result in a strong texture and mechanical anisotropy in AM components. Here, we have investigated the efficacy of a new approach to promote β grain refinement in Wire–Arc Additive Manufacture (WAAM) of large scale parts, which combines a rolling step sequentially with layer deposition. It has been found that when applied in-process, to each added layer, only a surprisingly low level of deformation is required to greatly reduce the β grain size. From EBSD analysis of the rolling strain distribution in each layer and reconstruction of the prior β grain structure, it has been demonstrated that the normally coarse centimetre scale columnar β grain structure could be refined down to

Subfields: Materials Chemistry, Mechanical Engineering

View Paper: https://www.semanticscholar.org/paper/83c99b8a8471a31c6e0f0885fe4782e464b1941d

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Materials Chemistry

In Mechanical Engineering

Citations in the corpus

Additive manufacturing of metallic components – Process, structure and properties (2018, background): “The temperature field was then inputted into a stress model based on Abaqus, a commercial finite element analysis (FEA) code, to calculate the residual stresses and distortion in laser powder blown AM of Ti-6Al-4V and IN718.”
Control of residual stress and distortion in aluminium wire + arc additive manufacture with rolling (2018, background): “Inter-pass rolling has been found not only to modify the internal stresses in WAAM, but also the microstructure [12], [41], [42].”
Current Status and Perspectives on Wire and Arc Additive Manufacturing (WAAM) (2019, background): “Electron backscatter diffraction (EBSD) maps of the α-phase (a–c) and reconstructed βparent phase (d–f) of samples produced without rolling and with rolling loads of 50 kN and 75 kN (adapted from [51]).”
Enhancing mechanical properties of wire + arc additively manufactured INCONEL 718 superalloy through in-process thermomechanical processing (2018, background): “Since the stored energy induced by rolling provides the thermodynamic driving force to trigger recrystallization [27,28], the hardened zone in the central area shows a more pronounced recrystallization as compared to the area outside it, thus resulting in the duplex grain structure.”
Study on Arc Welding Processes for High Deposition Rate Additive Manufacturing (2018, background): “In this case, heat or mechanical treatments, such as rolling proposed by [16], could be interesting in order to reduce the elongation at break and improve strength properties.”
Anisotropy and heterogeneity of microstructure and mechanical properties in metal additive manufacturing: A critical review (2018, background): “AC C EP TE D M AN U SC R IP T 4V alloy has been demonstrated to be effective in refining the grain size [89].”
Residual stress and texture control in Ti-6Al-4V wire + arc additively manufactured intersections by stress relief and rolling (2018, methodology): “The manufacture of structural application components requires more complex features than straight and free-standing walls, such as curves and intersections, as shown in a typical WAAM application in Figure 2.”
A review of wire arc additive manufacturing and advances in wire arc additive manufacturing of aluminium (2018, methodology): “with grain size impressively reduced to 100μm (34) by instigation of dislocations at the 17 wall surface which is acting as a substrate for the next depositing layer that disturbs the 18”