Effects of Defects in Laser Additive Manufactured Ti-6Al-4V on Fatigue Properties

By E. Wycisk, A. Solbach, S. Siddique, D. Herzog, F. Walther, C. Emmelmann. 2014

453 citations recorded by the source corpus.

Abstract Laser Additive Manufacturing (LAM) enables economical production of complex lightweight structures as well as patient individual implants. Due to these possibilities the additive manufacturing technology gains increasing importance in the aircraft and the medical industry. Yet these industries obtain high quality standards and demand predictability of material properties for static and dynamic load cases. However, especially fatigue and crack propagation properties are not sufficiently determined. Therefore this paper presents an analysis and simulation of crack propagation behavior considering Laser Additive Manufacturing specific defects, such as porosity and surface roughness. For the mechanical characterization of laser additive manufactured titanium alloy Ti-6Al-4V, crack propagation rates are experimentally determined and used for an analytical modeling and simulation of fatigue. Using experimental results from HCF tests and simulated data, the fatigue and crack resistance performance is analyzed considering material specific defects and surface roughness. The accumulated results enable the reliable prediction of the defects influence on fatigue life of laser additive manufactured titanium components.

Subfields: Automotive Engineering, Mechanical Engineering

View Paper: https://www.semanticscholar.org/paper/be36b1cc35ccf3351655523aebc6f39209013cca

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Automotive Engineering

In Mechanical Engineering

Citations in the corpus

Improving the fatigue behaviour of a selectively laser melted aluminium alloy: Influence of heat treatment and surface quality (2016, methodology): “Edwards and Ramulu [20] recommended peening to induce compressive residual stresses at the surface since their Ti-6Al-4V SLM parts had tensile residual stresses.”
Surface modification of additive manufactured components by ultrasonic cavitation abrasive finishing (2017, background): “[2] have argued that surface defects on as-built SLM Ti-6Al-4V act as crack initiation sites, hence resulting in its significantly lower fatigue endurance limit.”
Additive manufacturing of metals (2016, methodology): “However, material defects such as porosity and insufficient layer bonding result in increased scatter of the experimental data [145], rendering an assessment of the fatigue properties rather difficult.”
Additive manufacturing of fatigue resistant materials: Challenges and opportunities (2017, methodology): “[68] studied HCF behavior of Ti-6Al-4V fabricated via L-PBF under as-built (Ra = 12 lm) and polished conditions at a stress ratio of Rr = 0.”
Effect of surface roughness on fatigue performance of additive manufactured Ti–6Al–4V (2016, background): “Wycisk et al.8,24 investigated the fatigue properties of as built, round,DMLS, Ti–6Al–4V specimens (Kt ¼ 1), with an r ratio of 0.1.”
Criticality of porosity defects on the fatigue performance of wire + arc additive manufactured titanium alloy (2019, background): “These approaches [29,30,36,39] have been proven to be accurate for the lack of fusion defects [9,32,40], which are similar to a planar crack geometry.”