The anisotropy of high cycle fatigue property and fatigue crack growth behavior of Ti–6Al–4V alloy fabricated by high-power laser metal deposition

Lv, Hang; Zhang, Zhenlin; Chen, Yarong; Liu, Yan; Chen, Hui; Chen, Yong; Cheng, Jing; She, Jian; He, Huabing; Chen, Jintao

doi:10.1016/j.msea.2022.143745

Cited by 19 publications

(10 citation statements)

References 56 publications

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“…In addition, some studies did not observe significant microstructural effects on anisotropy and consequently the isotropic fatigue performance. 36,[62][63][64] The main factor of BO that affects the anisotropy of fatigue crack growth properties is the microstructure. Several studies have illustrated that there is an SIF transition point ΔK T in the crack growth curve of AM metals, and in the near-threshold region before ΔK T , orientationdependent microstructure dominates crack growth.…”

Section: Effect Of Bomentioning

confidence: 99%

“…Liu et al 61 found that the fracture surfaces of H specimens had larger facets near the porosity defects, which led to the suggestion that the weak joint of columnar grain boundaries in the LMD titanium alloy makes it easier for cracks to propagate. In addition, some studies did not observe significant microstructural effects on anisotropy and consequently the isotropic fatigue performance 36,62–64 …”

Section: Fatigue Characteristics Of Am Metalsmentioning

confidence: 99%

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Recent developments and future trends in fatigue life assessment of additively manufactured metals with particular emphasis on machine learning modeling

Zhan,

He,

Tang

et al. 2023

Fatigue Fract Eng Mat Struct

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Additive manufacturing (AM) has emerged as a very promising technology for producing complex metallic components with enhanced design flexibility. However, the mechanical properties and fatigue behavior of AM metals differ significantly from conventionally manufactured materials, thereby presenting challenges in accurately predicting their fatigue life. This study provides a comprehensive overview of recent developments and future trends in fatigue life prediction of AM metals, with a particular emphasis on machine learning (ML) modeling techniques. This review recalls recent developments and achievements in fatigue characteristics of AM metals, ML‐based approaches for fatigue life prediction of AM metals, and non‐ML‐based methodologies for the same purpose. In particular, some commonly used regression and classification techniques for fatigue evaluation of AM metals are summarized and elaborated. The study intends to furnish researchers, engineers, and practitioners in the field of AM with a guidance for the accurate and efficient prediction of fatigue life in AM metal components.

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Section: Effect Of Bomentioning

confidence: 99%

Section: Fatigue Characteristics Of Am Metalsmentioning

confidence: 99%

Recent developments and future trends in fatigue life assessment of additively manufactured metals with particular emphasis on machine learning modeling

Zhan,

He,

Tang

et al. 2023

Fatigue Fract Eng Mat Struct

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“…Ti-6Al-4V alloy is widely used to manufacture large structural parts in the aerospace field due to its high strength-to-weight ratio, superior corrosion resistance, and excellent oxidation resistance at elevated temperatures [1][2][3]. During the last two decades, additive manufacturing (AM) technologies have developed rapidly and become the best candidate for manufacturing metal components.…”

Section: Introductionmentioning

confidence: 99%

Influence of Medium–High Temperature Annealing on Microstructure and Properties of High-Power Laser Melting Deposited Ti-6Al-4V Alloy

Chen

Zhang

et al. 2023

Coatings

Self Cite

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A high-power laser melting deposition (HP-LMD) device with a maximum output of 5 kW was developed to enhance the production efficiency of fabricating large-scale titanium components. In this study, the medium–high temperature annealing strategy was proposed, wherein the effects of holding temperature and holding time on the residual stress, microstructure evolution, and mechanical properties of the fabricated block were evaluated. The results showed that the residual stress on the surface of the fabricated blocks reduced significantly after annealing treatment. The microstructure of as-deposited Ti-6Al-4V alloy mainly consisted of α’ martensite and basket-weave microstructure, and the aspect ratio of the martensite decreased from 22 to 6 with the increases in annealing temperature and holding time. In addition, the annealing treatments had a favorable benefit on the microhardness and tensile performance of the HP-LMD fabricated Ti-6Al-4V alloy. The optimum annealing treatment was 650 °C/2 h followed by furnace cooling. The tensile samples processed by the optimum annealing treatment exhibited excellent properties with a yield strength of 912 MPa and an elongation of 11.48%, which far exceeded the Chinese aviation standard. In addition, the results of the statistical analysis revealed that the tensile properties of heat-treated samples were superior to as-deposited samples when the aspect ratio of martensite was in the range of 9–14. The fracture mode of both the as-deposited samples and annealed samples was ductile fracture.

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“…Recently, fatigue properties of LAM manufactured Ti-6Al-4V have received much attention. Most of these studies focused on traditional tensile fatigue behavior [20][21][22][23][24][25][26]. Bandyopadhyay et al [20] studied the influence of building direction on fatigue properties of laser engineered net shaped (LENS) Ti-6Al-4V, and reported that the horizontally orientated samples showed a higher fatigue strength.…”

Section: Introductionmentioning

confidence: 99%

“…Zhang et al [16] found that projected area of LoF defects vertical to the deposition direction is larger than that along the deposition direction, which results in lower fatigue strength of vertically orientated samples. Lv et al [21] studied the anisotropic fatigue crack growth rate in laser melted deposited (LMD) Ti-6Al-4V, and pointed out that horizontally orientated sample exhibited fatigue cracks interacting with only one or two columnar grains, resulting in lower fatigue crack growth resistance.…”

Section: Introductionmentioning

confidence: 99%

An Investigation of Anisotropic Fatigue Properties of Laser Additively Manufactured Ti-6Al-4V under Vibration Loading

He¹,

Huang²,

Guo³

et al. 2023

Preprint

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Laser additively manufactured (LAM) Ti–6Al–4V alloy has huge application potential in aerospace structural parts such as turbine blades. However, there are few studies on the fatigue properties of such LAM parts under vibration loading, particularly with regard to anisotropy. In this paper, vibration fatigue properties of LAM Ti-6Al-4V by laser melted deposition process were investigated along the transversely deposited (TD) direction and parallelly deposited (PD) direction. Through the first-order bending vibration experiments, LAM Ti-6Al-4V alloy exhibits obvious anisotropic fatigue properties and significant dispersion in fracture position. The fracture morphology analysis reveals that the vibration fatigue failure was mainly dominated by the LAM process-induced defects and the microstructure. For the LAM samples without defects at crack initiation sites, the fatigue behavior is controlled by the prior β columnar grains with preferential orientation, which leads to enhanced fatigue crack propagation resistance for the PD samples. For the LAM samples with defects at initiation sites, having lower fatigue lives, the fatigue anisotropy strongly depends on the projection area of the lack-of-fusion defects relative to the loading direction, resulting in better fatigue performance for the TD samples.

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The anisotropy of high cycle fatigue property and fatigue crack growth behavior of Ti–6Al–4V alloy fabricated by high-power laser metal deposition

Cited by 19 publications

References 56 publications

Recent developments and future trends in fatigue life assessment of additively manufactured metals with particular emphasis on machine learning modeling

Recent developments and future trends in fatigue life assessment of additively manufactured metals with particular emphasis on machine learning modeling

Influence of Medium–High Temperature Annealing on Microstructure and Properties of High-Power Laser Melting Deposited Ti-6Al-4V Alloy

An Investigation of Anisotropic Fatigue Properties of Laser Additively Manufactured Ti-6Al-4V under Vibration Loading

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