High Pressure Interpass Rolling of Wire + Arc Additively Manufactured Titanium Components

Paul A Colegrove,Blanka A Szost,Stewart W Williams,David Jarvis,Philip J Withers,Filomeno Martina,Matthew J Roy,Sofiane Terzi

doi:10.4028/www.scientific.net/amr.996.694

Abstract

Wire + Arc Additively Manufactured components contain significant residual stresses that manifest in distortion. Each layer of an additively manufactured wall was rolled with the aim of reducing the residual stress. Neutron diffraction and contour method measurements show that the residual stresses were reduced particularly at the boundary with the substrate. The process also reduced distortion, and refined the microstructure which may facilitate implementation on aerospace components.

Highlights

Additive manufacture describes a collection of manufacturing processes where components are manufactured by breaking a CAD model down into layers each of which are deposited using a variety of techniques that are either powder or wire-based
In this paper we investigate whether the residual stress modification that was observed in interpass rolled Wire + Arc Additive Manufacture (WAAM) walls in steel is observed in titanium and how this compares with a wall in the as deposited state
A plot of the maximum out-of-plane distortion is shown in Fig. 3(a) and illustrates how it reduced with increasing rolling load

Summary

Introduction

Additive manufacture describes a collection of manufacturing processes where components are manufactured by breaking a CAD model down into layers each of which are deposited using a variety of techniques that are either powder or wire-based. One of those techniques, Wire + Arc Additive Manufacture (WAAM) [1] uses deposition processes based on welding to deposit metal in the form of wire. Ding et al [3] describes how steel components are affected by residual stresses and distortion during WAAM. The distortion leads to poor build tolerances, while the residual stress negatively affects part performance. Residual stresses have been reported in parts manufactured by electron beam [5] and laser-based [6,7] additive manufacture processes

Methods

Results

Conclusion