Low cycle fatigue properties of Ti-6Al-4V alloy fabricated by high-power laser directed energy deposition: Experimental and prediction

Ren, Yongming; Lin, Xin; Guo, Pengfei; Yang, Haiou; Tan, Hua; Chen, J.; Li, Jianling; Zhang, Y.Y.; Huang, Weidong

doi:10.1016/j.ijfatigue.2019.05.035

Cited by 57 publications

(36 citation statements)

References 45 publications

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“…16,17 Thus, the concern of fatigue performance restricts the applications of AM parts, especially in the industries where the long-term reliability is a critical requirement. In recent years, the behaviour of low-cycle fatigue (LCF) 18,19 and high-cycle fatigue (HCF) [20][21][22] of AM titanium alloys (e.g., Ti-6Al-4V) has been investigated. However, just a few studies 23,24 with regard to the veryhigh-cycle fatigue (VHCF) behaviour of the Ti-6Al-4V parts manufactured by SLM are available in the literature.…”

Section: Introductionmentioning

confidence: 99%

Influence of processing parameters of selective laser melting on high‐cycle and very‐high‐cycle fatigue behaviour of Ti‐6Al‐4V

Qian

Zheng

et al. 2020

Fatigue Fract Eng Mat Struct

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Orthogonal experiment design together with the analysis of variance was used to examine the processing parameters (laser power, scan speed, layer thickness and hatch spacing) of selective laser melting (SLM) for superior properties of SLM parts, in which nine groups of specimens of Ti-6Al-4V were fabricated. The results clarify that the influence sequence of individual parameter on the porosity is laser power > hatch spacing > layer thickness > scan speed. Ultrasonic fatigue tests (20 kHz) were conducted for the SLMed specimens in highcycle fatigue (HCF) and very-high-cycle fatigue (VHCF) regimes. The S-N data show that the fatigue strength is greatly affected by the porosity: the group with the smallest porosity percentage having the highest fatigue strength in HCF and VHCF regimes. Then, the tests on the validation group were performed to verify the optimal combination of SLM processing parameters. Moreover, the observations by scanning electron microscopy revealed that fatigue cracks initiate at lack-of-fusion defects in the cases of surface and internal crack initiation.

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Section: Introductionmentioning

confidence: 99%

Influence of processing parameters of selective laser melting on high‐cycle and very‐high‐cycle fatigue behaviour of Ti‐6Al‐4V

Qian

Zheng

et al. 2020

Fatigue Fract Eng Mat Struct

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“…A number of studies have been published to investigate the fatigue life of metals. Most of the damage prediction models are based on statistical test data analysis or on experimental curve fit [ 5 , 6 , 7 , 8 , 9 , 10 , 11 ]. Low cycle fatigue life prediction in Ti-6Al-4V alloys are generally done, based on stress [ 12 ], strain [ 5 , 6 , 13 , 14 , 15 , 16 ] or hysteresis loss [ 17 ].…”

Section: Introductionmentioning

confidence: 99%

“…Most of the damage prediction models are based on statistical test data analysis or on experimental curve fit [ 5 , 6 , 7 , 8 , 9 , 10 , 11 ]. Low cycle fatigue life prediction in Ti-6Al-4V alloys are generally done, based on stress [ 12 ], strain [ 5 , 6 , 13 , 14 , 15 , 16 ] or hysteresis loss [ 17 ]. Most of them are empirical curve-fit models [ 7 , 9 , 13 , 18 , 19 , 20 , 21 , 22 ] or mechanism based phenomenological models [ 23 , 24 , 25 ] such as fatigue crack initiation models [ 16 ].…”

Section: Introductionmentioning

confidence: 99%

“…The interpretation of the results using one-dimensional model is also easy as it can be simple in its form and usage. A number of one-dimensional empirical curve-fit fatigue life prediction models can be seen in the literature [ 5 , 6 , 7 , 8 , 11 , 12 , 14 , 15 , 16 , 17 ]. Nevertheless, a physics-based one-dimensional model, which can be easily used to predict the fatigue life of Ti-6Al-4V, under appropriate assumptions, is still not found in the literature.…”

Section: Introductionmentioning

confidence: 99%

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Low Cycle Fatigue Life Prediction Using Unified Mechanics Theory in Ti-6Al-4V Alloys

Kumar

Rao

et al. 2019

Entropy

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Fatigue in any material is a result of continuous irreversible degradation process. Traditionally, fatigue life is predicted by extrapolating experimentally curve fitted empirical models. In the current study, unified mechanics theory is used to predict life of Ti-6Al-4V under monotonic tensile, compressive and cyclic load conditions. The unified mechanics theory is used to derive a constitutive model for fatigue life prediction using a three-dimensional computational model. The proposed analytical and computational models have been used to predict the low cycle fatigue life of Ti-6Al-4V alloys. It is shown that the unified mechanics theory can be used to predict fatigue life of Ti-6Al-4V alloys by using simple predictive models that are based on fundamental equation of the material, which is based on thermodynamics associated with degradation of materials.

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“…However, with the introduction of heterogenous hard brittle coating, the mechanical and fatigue property of Ti-6Al-4V substrate will be inevitably affected [6,11]. Furthermore, according to the service conditions of aerospace parts, aircraft engine compressor blades or other components are subjected to low-cycle fatigue, high-cycle fatigue, and other types of loads [12,13]. This means that the fatigue behavior as well as mechanical strength of the coated titanium alloy parts should not be significantly weakened.…”

Section: Introductionmentioning

confidence: 99%

Fatigue and Mechanical Behavior of Ti-6Al-4V Alloy with CrN and TiN Coating Deposited by Magnetic Filtered Cathodic Vacuum Arc Process

Zhang

Chen

et al. 2019

Coatings

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Coatings of 3 μm CrN and TiN were prepared by a magnetic filtered cathodic vacuum arc process (MFCVA) on Ti-6Al-4V substrates, respectively. Rotating bending tests and uniaxial tests were conducted for investigating the effect of the thin and uniformly distributed hard CrN and TiN coatings on the fatigue and mechanical properties of Ti-6Al-4V substrate. During both tests, no coating spallation phenomenon was observed, which indicated that the hard coating bound well with the substrate. The fatigue test results showed that the fatigue strength of the coated sample was decreased in both the low- and high-cycling fatigue regimes compared with the uncoated Ti-6Al-4V substrate. Compared with the TiN coating, the CrN coating caused a more significant reduction on the fatigue property of the uncoated Ti-6Al-4V substrate due to its inferior plastic deformation capacity. Furthermore, the tensile test results showed that the coated sample had a relative higher ultimate strength, yield strength, and lower elongation compared with the uncoated Ti-6Al-4V substrate. This may be due to the fact that the hard coating could suppress the initiation of cracks, and so higher stress was needed for crack initiating. During the crack propagation period, the hard coating cracked at a relative higher velocity, which led to cracking of the ductile substrate and elongation reduction.

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Low cycle fatigue properties of Ti-6Al-4V alloy fabricated by high-power laser directed energy deposition: Experimental and prediction

Cited by 57 publications

References 45 publications

Influence of processing parameters of selective laser melting on high‐cycle and very‐high‐cycle fatigue behaviour of Ti‐6Al‐4V

Influence of processing parameters of selective laser melting on high‐cycle and very‐high‐cycle fatigue behaviour of Ti‐6Al‐4V

Low Cycle Fatigue Life Prediction Using Unified Mechanics Theory in Ti-6Al-4V Alloys

Fatigue and Mechanical Behavior of Ti-6Al-4V Alloy with CrN and TiN Coating Deposited by Magnetic Filtered Cathodic Vacuum Arc Process

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