Distribution of macroscopic and intergranular residual stresses in Wire Arc Additively Manufactured structures

Wire Arc Additive Manufacturing (WAAM) is a promising additive manufacturing technique that allows for structures to be built with a high degree of freedom of design and repair large components. Residual stress induced by high temperature gradients are one of the main limiting factors affecting mechanical performance of WAAM parts. An analysis of the residual stress distribution within WAAM Ti-6Al-4V parts using synchrotron energy dispersive diffraction will allow to calibrate simulation tools and to optimize the process. The proposed study aims to characterize the macroscopic residual stress and intergranular stress distribution in WAAM parts produced with different interlayer times; and to determine the variation of residual stress at the interface between WAAM part and substrate, and at internal WAAM interfaces within the individual layers.

电弧增材制造（Wire Arc Additive Manufacturing，WAAM）是一种极具应用前景的增材制造技术，可实现高设计自由度的结构制造，并可用于大型构件的修复。由高温梯度诱发的残余应力，是影响电弧增材制造成件力学性能的主要限制因素之一。采用同步辐射色散衍射技术对Ti-6Al-4V电弧增材制造成件的残余应力分布进行分析，可用于校准仿真工具并优化制备工艺。本研究旨在表征不同层间停留时间下制备的电弧增材制造成件的宏观残余应力与晶间应力分布，并探明电弧增材制造成件与基板界面、各单层内部增材界面处的残余应力变化规律。