Fatigue failure analysis of V–4Ti–4Cr alloy

Aglan, H.; Gan, Yong X.; Chin, B.A.; Grossbeck, M.L.

doi:10.1016/s0022-3115(99)00029-x

Cited by 9 publications

(7 citation statements)

References 48 publications

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“…These following conditions, as outlines by ASTM E399, are then validated to confirm the estimated fracture toughness value [1].…”

Section: Fracture Resistance Behaviormentioning

confidence: 94%

“…Various metals and alloys have been used as structural materials including vanadium, titanium, tungsten, tantalum, molybdenum, niobium, oxide dispersion strengthened alloys, stainless steel, etc. Among them, titaniumbased alloys are addressed as promising candidate materials for extreme temperature applications especially in nuclear reactors due to their superior thermo physical properties [1][2][3][4]. More precisely, these alloys have been used in fusion reactors as structural materials for the first wall, the magnetic coil structures, and the blanket [5].…”

Section: Introductionmentioning

confidence: 99%

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Effect of Extreme Environmental Temperature on the Fracture Resistance, and Fatigue Behavior of Dual Phase Ti-6al-4v Alloy

Islam

Moon

Aglan

2020

Proceeding of 5th Thermal and Fluids Engineering Conference (TFEC)

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The behavior of materials subjected to extreme environments is a challenging and diverse topic of interest to many researchers. Typically, structural materials in advanced energy systems are subjected to extreme heat, pressure, and radiation fluxes that may promote accelerated degradation. Titanium-based alloys are considered as favorable structural materials for diverse applications in such extreme environments, particularly in nuclear reactors, aerospace, and high temperature applications. In this work, the effect of extreme environmental temperature on the mechanical, fracture resistance, and fatigue behavior of dual phase Ti-6Al-4V alloy was investigated. Rectangular tensile specimens and single edge notched specimens of 75×12.7×0.81 mm were cut along the rolling direction and were exposed to environmental temperatures of 650 o C, and 900 o C for two hours to simulate the extreme environmental conditions. The mechanical and fracture behavior of the materials exposed to these elevated temperatures were evaluated and the result revealed that the tensile strength and fracture toughness of the alloy was dropped significantly by 25%, and 40%, respectively after the exposure to 900 o C from the ambient values. The fracture surface morphology of this alloy displayed strong ductile behavior with dimple features at room temperature, but some voids formed at 900 o C along the grain boundaries with significant ductility loss due to the formation of Ti3Al phase. Microstructural analysis showed that as the temperature increased, the density of retained β grains also reduced in α matrix. The fatigue test showed substantial loss of fatigue life and higher crack growth rate at higher temperatures.

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“…These following conditions, as outlines by ASTM E399, are then validated to confirm the estimated fracture toughness value [1].…”

Section: Fracture Resistance Behaviormentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

Effect of Extreme Environmental Temperature on the Fracture Resistance, and Fatigue Behavior of Dual Phase Ti-6al-4v Alloy

Islam

Moon

Aglan

2020

Proceeding of 5th Thermal and Fluids Engineering Conference (TFEC)

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“…The energy dissipated into damage formation is considered as the indentation penetration driving force. A materials parameter, the specific energy of damage is used as the contact damage tolerance criterion as previously introduced for some materials in [41][42][43][44][45][46]. Correlation between the contact damage tolerance and the microstructure of the material is made.…”

Section: Contact Damage Propagation Stage: Macroscale Approachmentioning

confidence: 99%

Energy Dissipation Criteria for Surface Contact Damage Evaluation

Gan¹

2012

Continuum Mechanics - Progress in Fundamentals and Engineering Applications

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IntroductionThis chapter presents the energy dissipation approach for analyzing surface contact damages in various materials, including composite materials. As known, surface contact is a very common phenomenon, which can be found in daily life and many scientific and engineering problems. The contact of different bodies can be modeled as indentation. Analysis of indentation and modeling of the deformation states of indented materials are often difficult because of the complexity of stress distributions within indentation zones. It is a l s o v e r y d i f f i c u l t t o e v a l u a t e s t r e s s s t a t e s i n r e g i o n s u n d e r n e a t h a n i n d e n t e d z o n e . Instrumental indentation has been performed on various materials including composite materials. Experimental studies on indention of coatings and brittle materials have been reported extensively, but the criterion for evaluating the extent of damage is not unified. Ductile materials deform relatively stable in indentation processes. While brittle materials are sensitive to compressive contact loadings in view of the formation of surface cracks. Therefore, it is difficult to find a unified stress or strain based damage criterion to characterize the damage evolution. Energy dissipation analysis may be more accurate to describe the deformation behavior of such materials. Specifically, under wedge indentation, the analysis should be investigated because the stress field has the singularity which limits the applicability of the strength criterion. In this chapter, the load-displacement relations with elastic-plastic responses of the materials associated with the indentation processes will be obtained to calculate the hysteresis energy. Lattice rotation measurement using electron backscatter diffraction (EBSD) technique will be performed in the region ahead of the indenter tip to measure the dimension of the contact damage zone (CDZ) and the results will be used to define the length scales in contact deformation. A unified criterion using the hysteresis energy normalized by the length scales will be established.Damage evolution in composite materials is very sensitive to the interaction of reinforcements and matrices in interface regions. For example, the development of damage in glass particle and fiber reinforced epoxy composite materials is strongly influenced by the interface debonding conditions [1]. However, the exact effect of bonding conditions on the performance of particle filled composite materials is still not fully understood. Kawaguchi and Pearson [2] reported that strong matrix-particle adhesion may lower the fatigue crack propagation resistance. While the studies on Si 3 N 4 nanoparticle filled epoxy composites www.intechopen.com Continuum Mechanics -Progress in Fundamentals and Engineering Applications

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“…Results based on the fractography of quasi-static uniaxial tension showed that the alloys are typically ductile material with the microvoid coalescence fracture mechanism at ambient temperature [1][2][3][4][5]. The fracture mechanism and mechanical properties of V-Cr-Ti alloys can easily be changed [6][7][8][9][10][11][12][13][14]. For example, the fracture mechanism of compact tension (1/2 CT) specimens is different from the smooth uniaxial tensile specimens [3,8].…”

Section: Introductionmentioning

confidence: 99%

In-situ SEM observation on the fracture of V–5Cr–5Ti alloy

Dong

et al. 2012

Journal of Nuclear Materials

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a b s t r a c tThe damage and fracture characteristic of V-5Cr-5Ti (wt.%) alloy was investigated using scanning electron microscope (SEM) with a micro-tension holder. Two types of specimen were used: smooth sheet and single-edge notched sheet. Results show that the microscopic fracture mechanism of smooth sheet alloy is microvoid coalescence and sliding off. What the fracture process shows is that the damage of smooth specimen stems from the inside. The alloy can be strengthened by single-edge notch but still remains considerable ductility. The main fracture mechanism of notched specimens is sliding off and quasicleavage. The main crack initiates at the root of notch and propagates along a zig-zag path. Grain boundary is a main barrier for crack propagation. Finite element method (FEM) simulation shows that the crack growth relaxes the stress of notched specimen, which in turn changes the fracture mechanism of alloy.

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Fatigue failure analysis of V–4Ti–4Cr alloy

Cited by 9 publications

References 48 publications

Effect of Extreme Environmental Temperature on the Fracture Resistance, and Fatigue Behavior of Dual Phase Ti-6al-4v Alloy

Effect of Extreme Environmental Temperature on the Fracture Resistance, and Fatigue Behavior of Dual Phase Ti-6al-4v Alloy

Energy Dissipation Criteria for Surface Contact Damage Evaluation

In-situ SEM observation on the fracture of V–5Cr–5Ti alloy

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