电弧增材制造技术及其在TC4钛合金中的应用研究进展

Additive manufacturing as a novel technology have developed since the middle of 1980s. More and more people focus on this technology since it can produce complex structures quickly and accurately. Wire and arc additive manufacturing technology adopts arc as heat source, and deposits the materials layer by layer. High deposition rates, low material and equipment costs, and the advantages in manufacturing large and complexity components that make wire and arc additive manufacturing technology widely used in aerospace industry, automobiles and ships. TC4 has become the most widely used titanium alloy due to the excellent comprehensive properties. The properties such as low thermal conductivity, high strength and high chemical activity of TC4, which make it difficult to fabricate the components by traditional manufacturing technologies. Therefore, the TC4 is manufactured by WAAM. However, the typical macrostructure of the WAAMed components is the epitaxially grown columnar grain, which leads to anisotropy in its mechanical properties. In present work, the development history of wire and arc additive manufacturing technology is introduced. Combining its characteristics and the research status at home and abroad, the study on the microstructure and mechanical properties of TC4 titanium alloy manufactured by wire and arc additive manufacturing technology is introduced.