Effect of microstructure on high cycle fatigue behavior of Ti–5Al–5Mo–5V–3Cr–1Zr titanium alloy

Huang, Chaowen; Zhang, Yongqing; Xin, Shewei; Tan, Changsheng; Zhou, Wei; Li, Qian; Zeng, Weidong

doi:10.1016/j.ijfatigue.2016.09.005

Cited by 81 publications

(27 citation statements)

References 30 publications

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“…A method named as small sampling up‐and‐down method (SSUDM, detailed in refs. ), was adopted during the high cycle fatigue tests with axially‐tensile‐compressing loadings. An empirical initial stress level was employed for the first sample.…”

Section: Methodsmentioning

confidence: 99%

High Cycle Fatigue Behaviors at High Temperatures of a Ti₂AlNb‐Based Alloy

et al. 2018

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High cycle fatigue (HCF) behaviors of the bimodal size lamellar O phase microstructures of Ti-22Al-25Nb alloy are studied at the potential service temperatures. The axially-tensile-compressing HCF strength limits of this alloy are measured to be 470 MPa at 650 C and 400 MPa at 700 C via the small sampling up-and-down method (SSUDM). The ratio of the maximum stress and the minimum stress (R ¼ σ max /σ min ) is À1 while the run out fatigue life is 10 7 cycles. It is found that transformation B2 ! β þ O occurs in the mode of cellular precipitations at initial B2 grain boundaries during the HCF tests. The transformation results in inhomogeneous regions in the microstructure. In those transformed regions, the acicular O phases are clearly coarser than in the normal regions. The HCF micro cracks preferentially initiate in the inhomogeneous regions along the slip lines in β phase or at the O/β boundaries perpendicular to the slip lines. The cleavage fracture characteristic of the bimodal size lamellar O phase microstructure of this Ti 2 AlNb-based alloy has significant effect on the HCF crack propagation. Flat fracture surface will form on cleavage planes in B2 grains. Moreover, different directions of cleavage planes in different B2 grains will deflect the straight HCF crack at B2 grain boundaries. It is the B2 matrix rather than the lamellar O phase in the bimodal size lamellar O phase microstructure that provides the crack-tip shielding effect. B2 grain boundaries are also beneficial to increase the inhibition of HCF crack propagation.

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Section: Methodsmentioning

confidence: 99%

High Cycle Fatigue Behaviors at High Temperatures of a Ti₂AlNb‐Based Alloy

et al. 2018

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“…AC; aging at 600 °C (6 h); AC 656 1248 4.610 [46] Ti-2Al-9.2Mo-2Fe β matrix with nano-scaled ω and α precipitates; ST at 850 °C (1 h); WQ; aging at 500 °C (2 h); WQ.…”

Section: Selected Alloysmentioning

confidence: 99%

Materials Selection of Optimized Titanium Alloys for Aircraft Applications

2018

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The aim of the present work was to explore the correlation between the physical metallurgy of titanium alloys and its main attributes to select optimized materials for structural aircraft applications in the landing gear beam. The Ashby's method was employed as the materials selection strategy to consolidate and evaluate the data collected from the current literature in a comprehensive and consistent analysis. Landing gear beam materials are mainly β and near-β alloys. Considering the need for high specific strength and fatigue resistance, the best candidate among them was Ti-3.5Al-5Mo-6V-3Cr-2Sn-0.5Fe alloy. Finally, a brief discussion of additional aspects related to alloy design, microstructural features and their influence on the mechanical properties is presented.

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“…10d displays that lots of deformation twins with size of about 50nm in widths are produced in α phase. It has been reported that deformation twins will be induced in many metals when the dislocation slip is not sufficient to accommodate the cyclic plastic deformation [6,[9][10][33][34]. In general, assuming everything else is equal, fatigue crack tends to nucleate in coarse grained material than the fine grained materials [6].…”

Section: Cracks Propagationmentioning

confidence: 99%

“…It has been reported that a fatigue crack is formed due to the localized plastic deformation during fatigue loading [9][10][11][12][13][14]. These strain concentration and gradient are primarily caused through the dislocation motion within the phase or grains of materials.…”

Section: Introductionmentioning

confidence: 99%

“…Due to the unpredictable and overwhelming failure, the investigation on the fatigue crack initiation has attracted a great amount of attention [9][10][11][12][13][21][22][23]. Wu et al [13] found that high cycle fatigue strength of Ti-6Al-4V is dependent on the microstructures and increases in the order of equiaxed microstructure, lamellar microstructure and bimodal microstructure.…”

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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Effect of microstructure on high cycle fatigue behavior of Ti–5Al–5Mo–5V–3Cr–1Zr titanium alloy

Cited by 81 publications

References 30 publications

High Cycle Fatigue Behaviors at High Temperatures of a Ti₂AlNb‐Based Alloy

High Cycle Fatigue Behaviors at High Temperatures of a Ti₂AlNb‐Based Alloy

Materials Selection of Optimized Titanium Alloys for Aircraft Applications

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

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Effect of microstructure on high cycle fatigue behavior of Ti–5Al–5Mo–5V–3Cr–1Zr titanium alloy

Cited by 81 publications

References 30 publications

High Cycle Fatigue Behaviors at High Temperatures of a Ti2AlNb‐Based Alloy

High Cycle Fatigue Behaviors at High Temperatures of a Ti2AlNb‐Based Alloy

Materials Selection of Optimized Titanium Alloys for Aircraft Applications

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

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Product

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High Cycle Fatigue Behaviors at High Temperatures of a Ti₂AlNb‐Based Alloy

High Cycle Fatigue Behaviors at High Temperatures of a Ti₂AlNb‐Based Alloy