Effects of heat accumulation on microstructure and mechanical properties of Ti6Al4V alloy deposited by wire arc additive manufacturing

By Bintao Wu, Zengxi Pan, Donghong Ding, Dominic Cuiuri, Huijun Li. Additive Manufacturing, 2018

210 citations recorded by the source corpus.

Abstract Complex thermal behaviour during fabrication plays an import role in the geometrical formation and mechanical properties of Ti6Al4V components manufactured using Wire Arc Additive Manufacturing (WAAM) technology. In this study, through in-situ temperature measurement, the heat accumulation and thermal behaviour during the gas tungsten wire arc additive manufacturing (GT-WAAM) process are presented. The effects of heat accumulation on microstructure and mechanical properties of additively manufactured Ti6Al4V parts were studied by means of optical microscopy (OM), X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive spectrometer (EDS) and standard tensile tests, aiming to explore the feasibility of fabricating Ti6Al4V parts by GT-WAAM using localized gas shielding. The results show that due to the influences of thermal accumulation, the layer’s surface oxidation, microstructural evolution, grain size, and crystalline phase vary along the building direction of the as-fabricated wall, which creates variations in mechanical properties and fracture features. It has also been found that it is necessary to maintain the process interpass temperature below 200 °C to ensure an acceptable quality of Ti6Al4V part fabricated using only localized gas shielding in an otherwise open atmosphere. This research provides a better understanding of the effects of heat accumulation on targeted deposition properties during the WAAM process, which will benefit future process control, improvement, and optimization.

Subfields: Automotive Engineering, Mechanical Engineering

View Paper: https://www.semanticscholar.org/paper/d50d86313b60b8c92551cdd023efca1b834817f1

How researchers see this paper

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In Automotive Engineering

1. Telmo G. Santos
2. J. P. Oliveira
3. V. Duarte
4. T. A. Rodrigues
5. R. Miranda
6. Volker Wesling
7. Kai Treutler

In Mechanical Engineering

1. J. P. Oliveira
2. Telmo G. Santos
3. R. Miranda
4. Volker Wesling
5. Kai Treutler
6. V. Duarte
7. T. A. Rodrigues

Citations in the corpus

• Revisiting fundamental welding concepts to improve additive manufacturing: From theory to practice (2020, background): “Though the production of functionally graded parts appeared not to be the aim of the researchers of [204], they showed that localized shielding gas during deposition could control differently the thermal cycles at distinct locations of the part, thus resulting in different microstructural and mechan”
• Current Status and Perspectives on Wire and Arc Additive Manufacturing (WAAM) (2019, background): “During WAAM, excessive heat accumulation can prevent the accurate control of bead geometry [122], but also might lead to differences in mechanical properties and microstructure wi h the increase f sampl s’ height [123] becoming important to perfor hea -treatments in order to achieve isotropic proper”
• The Current State of Research of Wire Arc Additive Manufacturing (WAAM): A Review (2021, background): “One is sufficient protection from oxygen to avoid the well-known oxygen-induced embrittlement and the accumulation of heat in the manufacturing process [298,316,320].”