Cu合金在电弧熔丝增材制造过程中的组织与力学性能演化

1 Introduction

Compared with the laser additive manufacture (LAM) using alloy powders, the wire and arc additive manufacture (WAAM) shows the advantages of low cost, wider application range, good flexibility and very high efficiency in manufacture of the larger sized components [1-3]. Besides, due to the high cooling rate, some mechanical properties of the components manufactured by WAAM are higher than that prepared through casting and machining [4-5]. Because of these advantages, WAAM is quite promising in manufacture of some complex aerospace components, such as large frames, wallboards and pressure vessels [2, 6-7]. Whereas, the thickness of each deposition layer is usually much higher in WAAM than that in the LAM, thus a solidification segregation in a relative large range will probably occur, and the heat input of the later deposition passes can affect the former deposition passes, which will obviously change the microstructure and may results in nonuniform in the mechanical property of the components. Therefore, it is necessary to reveal the evolution in microstructure and mechanical properties of the WAAM parts during the manufacture process.