Characteristic and mechanism of crack initiation and early growth of an additively manufactured Ti-6Al-4V in very high cycle fatigue regime

Sun, Chengqi; Chi, Weiqian; Wang, Wenjing; Duan, Yan

doi:10.1016/j.ijmecsci.2021.106591

Cited by 54 publications

(19 citation statements)

References 43 publications

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“…Around the initiation site, there was an obvious semicircular FGA, forming the initiation characteristic area (ICA) of the surface initiation. This finding was different from the results obtained in the earlier studies, which proposed that the FGA was absent if the fatigue crack initiated from the specimen surface 43,44 . Magnified morphology inside the FGA is presented in Figure 4B, which shows the existence of a relatively smooth region outside the initiation site.…”

Section: Resultscontrasting

confidence: 91%

“…After the fatigue cracks initiated from the surface, repeated contact of the fracture surface along the crack led to the formation of the FGA and fisheye, 18 which overturns the previous conclusion that FGA and fish‐eye morphology can only be found in the internal initiation. Sun et al 43 found that the fracture surface presented a fish‐eye‐like pattern along with an FGA morphology in the interior when the fatigue cracks initiated from the inside of the material. In contrast, the FGA and fish‐eye morphologies disappeared in surface initiation mode under the rotating bending fatigue test or the ultrasonic frequency fatigue test.…”

Section: Discussionmentioning

confidence: 99%

“…This finding was different from the results obtained in the earlier studies, which proposed that the FGA was absent if the fatigue crack initiated from the specimen surface. 43,44 Magnified morphology inside the FGA is presented in Figure 4B, which shows the existence of a relatively smooth region outside the initiation site. This relatively smooth region was smoother than the surrounding area, so it's called the smooth region for short.…”

Section: Fractography At Etmentioning

confidence: 99%

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Effects of microstructure on crack initiation in super martensitic stainless steel under very‐high‐cycle fatigue at elevated temperature

Wang

et al. 2022

Fatigue Fract Eng Mat Struct

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The present study envisaged the behavior and relevant crack initiation mechanism of super martensitic stainless steel (0Cr13Ni5Mo) at elevated temperature (ET) under very-high-cycle fatigue (VHCF). Fractographic analysis revealed that all the VHCF cracks of the failure specimens initiated from the surface and formed fine granular area (FGA) morphology at ET in an absence of vacuum. The initiation characteristic area (ICA) consisted of an initiation site, a relatively smooth area, and the annular continuous FGA. FGA was formed in the peaks and valleys of local microstructures, and the smooth regions connected these peaks and valleys dominated by shear stress. It was observed that the FGA was unevenly distributed on the crack surface related to the local microstructure and below the grain surface relevant to local strain distribution. The stress intensity factor (SIF) and the crack tip plastic zone of the ICA slightly changed with temperature.

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Section: Resultscontrasting

confidence: 91%

Section: Discussionmentioning

confidence: 99%

Section: Fractography At Etmentioning

confidence: 99%

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Effects of microstructure on crack initiation in super martensitic stainless steel under very‐high‐cycle fatigue at elevated temperature

Wang

et al. 2022

Fatigue Fract Eng Mat Struct

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“…Recently, there are results regarding the VHCF behavior of AM titanium alloys (Ti6Al4V) 59–66 and AlSi10Mg alloys 67–73 . Fatigue damage in VHCF behavior occurs between 10 7 and 10 9 cycles 61 .…”

Section: Factors Affecting Fatigue Strength and Behavior In Ammentioning

confidence: 99%

“…57 It has been stated in the literature that the level of surface roughness is inversely proportional to the fatigue strength. 21,58 Recently, there are results regarding the VHCF behavior of AM titanium alloys (Ti6Al4V) [59][60][61][62][63][64][65][66] and AlSi10Mg alloys. [67][68][69][70][71][72][73] Fatigue damage in VHCF behavior occurs between 10 7 and 10 9 cycles.…”

Section: Factors Affecting Fatigue Strength and Behavior In Ammentioning

confidence: 99%

An overview of factors affecting high‐cycle fatigue of additive manufacturing metals

Karakaş

Kardeş

Foti³

et al. 2023

Fatigue Fract Eng Mat Struct

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Recently, additive manufacturing technologies have become very important in the industry as they increase the freedom of design and provide the opportunity to realize very complex shapes in one step. Since the use of additive manufacturing has increased in addition to conventional manufacturing methods, the fatigue behavior of engineering materials such as AlSi10Mg, 316L, Ti6Al4V, and Ti64 produced by different additive manufacturing methods is reviewed. In this article, a detailed literature review is presented by evaluating recent studies on the high‐cycle and very high‐cycle fatigue behavior of engineering components produced with additive manufacturing technologies. In addition to the positive properties of additive manufacturing metals, fatigue performance is adversely affected due to negative properties such as high porosity, poor surface quality, and tensile residual stresses. In this article, factors affecting fatigue strength and postproduction processes required for the production of fatigue‐resistant additive manufacturing parts are explained.

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Acoustic emission for in situ process monitoring of selective laser melting additive manufacturing based on machine learning and improved variational modal decomposition

Wang

Xuan

2022

Int J Adv Manuf Technol

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Characteristic and mechanism of crack initiation and early growth of an additively manufactured Ti-6Al-4V in very high cycle fatigue regime

Cited by 54 publications

References 43 publications

Effects of microstructure on crack initiation in super martensitic stainless steel under very‐high‐cycle fatigue at elevated temperature

Effects of microstructure on crack initiation in super martensitic stainless steel under very‐high‐cycle fatigue at elevated temperature

An overview of factors affecting high‐cycle fatigue of additive manufacturing metals

Acoustic emission for in situ process monitoring of selective laser melting additive manufacturing based on machine learning and improved variational modal decomposition

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