Very high cycle fatigue (VHCF) response of additively manufactured materials: A review

Abstract

Recently, the diffusion of components produced through additive manufacturing (AM) processes has significantly increased. Concurrently, to ensure the safe employment of AM components, the research has focused on the assessment of their fatigue response. In the present paper, a comprehensive literature review on the very high cycle fatigue (VHCF) response of materials produced through AM processes is provided. The experimental results on the VHCF response of Ti6Al4V,

Study on fatigue crack growth behavior of selective laser‐melted Ti6Al4V under different build directions, stress ratios, and temperatures

“…1 Selective laser melting (SLM) is one of the most popular AM techniques, which is capable of medium build rates, good repeatability, and medium to high surface quality. 2,3 To date, many metal materials like titanium alloys, 4 superalloys, 5,6 and aluminum alloys 7 have been successfully printed by AM methods and studied for fatigue behavior. Hu et al 6 studied on the fatigue crack growth behavior of SLM Inconel 625.…”

“…Hu et al 6 studied on the fatigue crack growth behavior of SLM Inconel 625. Caivano et al 7 compared and analyzed the main factors affecting the very high cycle fatigue response of AM materials, including aluminum alloy, Inconel718, and Ti6Al4V. Titanium alloys, in particular, Ti6Al4V, is of specific strength, relative to its weight, corrosion resistance, and elevated operating temperature, which are commonly used for aerospace industries and is one of the most researched alloys by SLM techniques at present 8 …”

Interior long‐life‐fatigue cracking behavior and life prediction of a selective laser melted GH4169 superalloy at different temperatures and stress ratios

“…Popvich et al 28 proved the dissolution of hard and brittle Laves phases and the precipitation of acicular δ phase at the grain boundary, which can limit the grain boundary sliding, could improve the fatigue resistance of AM Ni‐base superalloy. The above researches are mainly focused on the analysis of crack initiation and propagation behavior in HCF regime, but there are a few researches concerning gigacycle fatigue of AM Ni‐base superalloy, especially under evaluated temperatures 29 . Recently, Yang et al 30 found that the interior crack nucleation induced fracture is the main failure mode of AM Ni‐based superalloy in gigacycle fatigue regime through carrying out the fully reversed fatigue tests.…”

“…The above researches are mainly focused on the analysis of crack initiation and propagation behavior in HCF regime, but there are a few researches concerning gigacycle fatigue of AM Ni-base superalloy, especially under evaluated temperatures. 29 Recently, Yang et al 30 found that the interior crack nucleation induced fracture is the main failure mode of AM Ni-based superalloy in gigacycle fatigue regime through carrying out the fully reversed fatigue tests. And the crack nucleation was caused by pore, lack of fusion or crystallographic facet.…”

Artificial Defects in 316L Stainless Steel Produced by Laser Powder Bed Fusion: Printability, Microstructure, and Effects on the Very‐High‐Cycle Fatigue Behavior

“…The lack of data on VHCF properties limits the use of AM technologies for the production and repair of critical parts such as turbine blades. The first review paper devoted to the VHCF of AM materials was published by Caivano et al [ 13 ] The authors summarized the experimental results on the VHCF response of selected aluminum alloys, along with Inconel 718, Ti6Al4V, and 316L specimens, printed by different AM techniques. Siddique et al [ 14 ] and Tridello et al [ 15 ] reported a strong influence of stress‐relieving heat treatments on the mechanical behavior of AM Al‐based alloys.…”