Effect of α-phase morphology on low-cycle fatigue behavior of TC21 alloy

Tan, Changsheng; Li, Xiangli; Sun, Qiaoyan; Lin, Xin; Zhang, Yongqing; Sun, Jun

doi:10.1016/j.ijfatigue.2015.01.010

Cited by 72 publications

(37 citation statements)

References 31 publications

(49 reference statements)

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“…The martensitic microstructure demonstrated the least LCF resistance due to crack propagation occurring along the martensite plate boundaries, reducing the tortuosity of the crack path. A comparison of the LCF and elastoplastic behaviour of an equiaxed and lamellar structure was conducted by Tan et al [80] using the titanium alloy TC21. This investigation revealed that crack nucleation at LCF occurred easier in the lamellar microstructure than the equiaxed microstructure.…”

Section: Micro-mechanism Contributionmentioning

confidence: 99%

A Review of the As-Built SLM Ti-6Al-4V Mechanical Properties towards Achieving Fatigue Resistant Designs

Agius

Kourousis

Wallbrink

2018

Metals

155

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Ti-6Al-4V has been widely used in both the biomedical and aerospace industry, due to its high strength, corrosion resistance, high fracture toughness and light weight. Additive manufacturing (AM) is an attractive method of Ti-6Al-4V parts' fabrication, as it provides a low waste alternative for complex geometries. With continued progress being made in SLM technology, the influence of build layers, grain boundaries and defects can be combined to improve further the design process and allow the fabrication of components with improved static and fatigue strength in critical loading directions. To initiate this possibility, the mechanical properties, including monotonic, low and high cycle fatigue and fracture mechanical behaviour, of machined as-built SLM Ti-6Al-4V, have been critically reviewed in order to inform the research community. The corresponding crystallographic phases, defects and layer orientations have been analysed to determine the influence of these features on the mechanical behaviour. This review paper intends to enhance our understanding of how these features can be manipulated and utilised to improve the fatigue resistance of components fabricated from Ti-6Al-4V using the SLM technology.

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Section: Micro-mechanism Contributionmentioning

confidence: 99%

A Review of the As-Built SLM Ti-6Al-4V Mechanical Properties towards Achieving Fatigue Resistant Designs

Agius

Kourousis

Wallbrink

2018

Metals

155

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“…However, the cyclic deformation and fatigue crack initiation behaviour of TC21 titanium alloy almost have not been reported [6,9]. Due to the significant of microstructure in initiation of crack, the effect of size of α phases on cyclic deformation and fatigue crack initiation during fatigue of TC21 titanium alloy was investigated in present work.…”

Section: Introductionmentioning

confidence: 99%

“…The majority of engineering titanium alloys is consisted of alpha or beta phase or a combination of the two phases with different volume fractions and morphologies. TC21 titanium alloy is a typical two phase alloy which possesses high strength and toughness, and has been successfully applied in the aerospace as a structural material [4][5][6]. During these applications, the structural member is mainly subjected to cyclic fatigue loading.…”

Section: Introductionmentioning

confidence: 99%

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Effect of size of alpha phases on cyclic deformation and fatigue crack initiation during fatigue of an alpha-beta titanium alloy

et al. 2018

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Abstract. Alpha phase exhibits equiaxed or lamellar morphologies with size from submicron to microns in an alpha-beta titanium alloy. Cyclic deformation, slip characteristics and crack nucleation during fatigue in different microstructures of TC21 alloy (Ti-6Al-2Sn-2Zr-3Mo-1Cr-2Nb-0.1Si) were systematically investigated and analyzed. During low-cycle fatigue, equiaxed microstructure (EM) in TC21 alloy exhibits higher strength, ductility and longer low-cycle fatigue life than those of the lamellar microstructure (LM). There are more voids in the single lamellar alpha than the equiaxed alpha grains. As a result, voids more easily link up to form crack in the lamellar alpha phase than the equiaxed alpha phase. However, during high-cycle fatigue, the fine lamellar microstructure (FLM) shows higher fatigue limit than bimodal microstructure (BM). The localized plastic deformation can be induced during high-cycle fatigue. The slip bands or twins are observed in the equiaxed and lamellar alpha phases( >1micron), which tends to form strain concentration and initiate fatigue crack. The localized slip within nanoscale alpha plates is seldom observed and extrusion/intrusion dispersedly distributed on the sample surface in FLM. This indicates that FLM show super resistance to fatigue crack which bring about higher fatigue limit than BM.

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“…Recently, a variety of studies investigated the effect of thermomechanical treatment [13], and oxidation treatment [14] on fatigue behavior of TC21 Ti-alloy [15]. However, detailed examination of the effect of heat treatment processes on wear behavior and tensile properties are rarely reported.…”

mentioning

confidence: 99%

Effect of Heat Treatment Processes on Microstructure and Mechanical Behavior of TC21 Titanium Alloy

Elshaer¹,

Ibrahim²,

Barakat³

et al. 2017

OJMetal

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The effect of heat treatment on microstructure and tensile properties as well as wear behavior on TC21 (Ti-6Al-2Sn-2Zr-3Mo-1Cr-2Nb-Si, wt.%) Ti-alloy was investigated. The samples were solution treated at 900˚C for 15 min followed by furnace cooling to 800˚C with a cooling rate 1˚C/min and holding for 20 min, then the samples cooled down to room temperature either using water quenching (WQ) or air cooling (AC). Consequently, aging treatment was applied at 575˚C for 4 hr. The microstructure feature showed a secondary α phase (α s ) precipitated in residual β phase due to the step cooling from 900˚C to 800˚C inside furnace as well as the aging treatment. The highest wear rate was obtained for WQ samples due to increasing in volume fraction of α p (58%). However, the lowest wear rate was reported for WQ + Aging samples due to the high hardness. Optimum mechanical properties of the studied TC21 Ti-alloy were obtained for AC + Aging condition. A better combination of hardness, tensile properties, and wear resistance was achieved for AC + Aging samples, although their wear resistance was found to be slightly lower than that of WQ + Aging samples.

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Effect of α-phase morphology on low-cycle fatigue behavior of TC21 alloy

Cited by 72 publications

References 31 publications

A Review of the As-Built SLM Ti-6Al-4V Mechanical Properties towards Achieving Fatigue Resistant Designs

A Review of the As-Built SLM Ti-6Al-4V Mechanical Properties towards Achieving Fatigue Resistant Designs

Effect of size of alpha phases on cyclic deformation and fatigue crack initiation during fatigue of an alpha-beta titanium alloy

Effect of Heat Treatment Processes on Microstructure and Mechanical Behavior of TC21 Titanium Alloy

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