Assessment of mechanical and fatigue crack growth properties of wire + arc additively manufactured mild steel components

Abstract

A study has been conducted to evaluate the mechanical and fatigue crack propagation properties of wire + arc additively manufactured ER70S‐6 components. A parallel‐built deposition strategy was employed to fabricate the additively manufactured wall. The hardness values were slightly higher at the bottom and top of the wall due to the presence of Widmanstätten ferrite and carbides. The characterization of mechanical properties in both orientations; parallel and perpendicular to the deposition direction showed a marginal difference in yield strength and ultimate tensile strength. The crack growth rates were correlated with linear elastic fracture mechanics parameter ΔK and compared with an oscillation‐built deposition strategy from the literature. The crack growth rates of both deposition strategies were found to be very similar to each other. Furthermore, it has been demonstrated that the variability in the crack growth histories can be reasonably well captured by using the NASGRO crack growth equation.

Multi-Criteria Decision Analysis of an Innovative Additive Manufacturing Technique for Onboard Maintenance

“…This material is not widely suited for onboard marine vehicles. Printers can now print more precisely and faster [10,11] and with stronger materials such as metallic [12][13][14], performance polymer [15], or ceramic [16] filaments. Hybrid advanced manufacturing allows for integrated 3D-printing and computer numerical control (CNC) machining, allowing 3D-printed components to be milled down for finer tolerances and threading [17].…”

Modelling Crack Growth in Additively Manufactured Inconel 718 and Inconel 625

“…In this context, it is now known that the Hartman-Schijve variant of the Nasgro crack growth equation can often be used to represent the growth of both long and short cracks in AM materials [7,8,[10][11][12][13][14][15][16][17][18][19][20][21][22][23], cold spray additively manufactured (CSAM) parts [8,24,25], and to compute the durability of cold spray repairs to conventionally built aluminium alloys parts [26].…”

“…Important features of this formulation are that it has been shown [7,8,[10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26] to:…”