Morphology investigation on direct current pulsed gas tungsten arc welded additive layer manufactured Ti6Al4V alloy

Wang, Fude; Williams, Stewart; Rush, Matthew T.

doi:10.1007/s00170-011-3299-1

Cited by 204 publications

(84 citation statements)

References 9 publications

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“…Besides, in the previous study, some parts produced by the methods of other additive manufacturing exist the anisotropy problem as well [13,14]. A summary of mechanical properties of austenitic steel parts made by various AM methods, compared with forged plate [7,16], is given in Table 2. Coincidentally, the previous study also found that the tensile strength and ultimate tensile strength of the transverse samples are greater than the longitudinal samples, and the elongation is also worse than the longitudinal samples, as the Table 2 shows.…”

Section: Tensile Strengthmentioning

confidence: 99%

Microstructure and mechanical properties of 304L steel fabricated by arc additive manufacturing

Liu

et al. 2017

MATEC Web Conf.

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Abstract. For 304L large structural parts used in nuclear power, it is hard and costly to fabricate and machine traditionally. Wire arc additive manufacturing (WAAM) has low cost and high material utilization, which provides an efficient way to fabricate the large structural parts. So in this study, WAAM is used to fabricate the parts of 304L stainless steel. Through the tensile test and metallographic analysis, the mechanical properties and microstructure of the 304L stainless steel fabricated by WAAM were explored. The results indicate that with the layers depositing, the cooling rate becomes slower, the dendrites become thicker and the morphology becomes more stable. Due to the existence of dendrites, the grain boundary strengthening effect is different between the transverse direction and longitudinal direction, and resulting in anisotropy of mechanical properties. However, the mechanical properties of the parts correspond to the forged piece, which lays the foundation for future applications.

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Section: Tensile Strengthmentioning

confidence: 99%

Microstructure and mechanical properties of 304L steel fabricated by arc additive manufacturing

Liu

et al. 2017

MATEC Web Conf.

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“…AM is a promising alternative for fabricating components made of expensive materials such as titanium and nickel in the aerospace industry where such components often suffer an extremely high buy-to-fly ratio. Many techniques have been developed for manufacturing metal structures in AM, such as Selective Laser Sintering [1], Direct Metal Deposition [2], Electron Beam Freeform Fabrication [3], Shape Deposition Manufacturing [4], and Wire and Arc Additive Manufacturing (WAAM) [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

A multi-bead overlapping model for robotic wire and arc additive manufacturing (WAAM)

Ding

Pan

Cuiuri

et al. 2015

Robotics and Computer-Integrated Manufacturing

358

128

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Wire and arc additive manufacturing (WAAM) is a promising alternative to traditional subtractive manufacturing for fabricating large aerospace components that feature high buy-to-fly ratio. Since the WAAM process builds up a part with complex geometry through the deposition of weld beads on a layer-by-layer basis, it is important to model the geometry of a single weld bead as well as the multi-bead overlapping process in order to achieve high surface quality and dimensional accuracy of the fabricated parts. This study firstly builds models for a single weld bead through various curve fitting methods. The experimental results show that both parabola and cosine functions accurately represent the bead profile. The overlapping principle is then detailed to model the geometry of multiple beads overlapping together. The tangent overlapping model (TOM) is established and the concept of the critical centre distance for stable multi-bead overlapping processes is presented. The proposed TOM is shown to provide a much better approximation to the experimental measurements when compared with the traditional flat-top overlapping model (FOM). This is critical in process planning to achieve better geometry accuracy and material efficiency in additive manufacturing. Abstract: Wire and arc additive manufacturing (WAAM) is a promising alternative to traditional subtractive manufacturing for fabricating large aerospace components that feature high buy-to-fly ratio. Since the WAAM process builds up a part with complex geometry through the deposition of weld beads on a layer-by-layer basis, it is important to model the geometry of a single weld bead as well as the multi-bead overlapping process in order to achieve high surface quality and dimensional accuracy of the fabricated parts. This study firstly builds models for a single weld bead through various curve fitting methods. The experimental results show that both parabola and cosine functions accurately represent the bead profile. The overlapping principle is then detailed to model the geometry of multiple beads overlapping together. The Tangent Overlapping Model (TOM) is established and the concept of the critical centre distance for stable multi-bead overlapping processes is presented. The proposed TOM is shown to provide a much better approximation to the experimental measurements when compared with the traditional Flat-top Overlapping Model (FOM). This is critical in process planning to achieve better geometry accuracy and material efficiency in additive manufacturing.

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“…As the build-up continues, the unidirectional heat flow characteristic of the additive layer manufacturing process contributes to columnar grains growth. [15] The delineation of top and bottom regions of the specimen is also displayed in Figure 2(a). Optical views of microstructure in the two regions are shown in Figures 2(b Figures 3(a) (bottom region) and (b) (top region).…”

Section: A Microstructure and Compositionmentioning

confidence: 99%

Characterization of In-Situ Alloyed and Additively Manufactured Titanium Aluminides

Cuiuri

Hoye

et al. 2014

Metall Mater Trans B

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Titanium aluminide components were fabricated using in-situ alloying and layer additive manufacturing based on the gas tungsten arc welding process combined with separate wire feeding of titanium and aluminum elements. The new fabrication process promises significant time and cost saving in comparison to traditional methods. In the present study, issues such as processing parameters, microstructure, and properties are discussed. The results presented here demonstrate the potential to produce full density titanium aluminide components directly using the new technique. Characterization of In-Situ Alloyed and Additively Manufactured Titanium Aluminides YAN MA, DOMINIC CUIURI, NICHOLAS HOYE, HUIJUN LI, and ZENGXI PAN Titanium aluminide components were fabricated using in-situ alloying and layer additive manufacturing based on the gas tungsten arc welding process combined with separate wire feeding of titanium and aluminum elements. The new fabrication process promises significant time and cost saving in comparison to traditional methods. In the present study, issues such as processing parameters, microstructure, and properties are discussed. The results presented here demonstrate the potential to produce full density titanium aluminide components directly using the new technique.

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Morphology investigation on direct current pulsed gas tungsten arc welded additive layer manufactured Ti6Al4V alloy

Cited by 204 publications

References 9 publications

Microstructure and mechanical properties of 304L steel fabricated by arc additive manufacturing

Microstructure and mechanical properties of 304L steel fabricated by arc additive manufacturing

A multi-bead overlapping model for robotic wire and arc additive manufacturing (WAAM)

Characterization of In-Situ Alloyed and Additively Manufactured Titanium Aluminides

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