Influence of Microstructure and Stress Ratio on Fatigue Crack Growth in a Ti-6-22-22-S alloy

Krüger, Lutz; Grundmann, Neele; Trubitz, P.

doi:10.1016/j.matpr.2015.05.011

Cited by 8 publications

(4 citation statements)

References 12 publications

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“…The tortuous cracks not only intensify the roughness-induced crack closure effect, but also increase the surface energy, reducing the fatigue crack driving force. These findings are consistent with the result of previous researches on fatigue crack growth behaviors in titanium alloys [6,10,[19][20], which have commonly proved that microstructures with coarser grains result in higher levels of crack deflection and roughness-induced crack closured effect.…”

Section: Resultssupporting

confidence: 93%

Fatigue Crack Growth Behaviors in Novel TC32 Titanium Alloy with Bimodal and Basket-Wave Microstructures

Zhi

Wang

et al. 2019

MSF

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This article investigated the fatigue crack growth behaviors in the novel TC32 titanium alloy with bimodal and basket-weave microstructures, which were respectively obtained by the convectional (α+β) phase forging and quasi-β forging processing. Results showed that at the same level of tensile performance, the basket-weave microstructure had a lower fatigue crack growth rate than the bimodal microstructure, as the basket-weave microstructure had a more tortuous crack path, a rougher fracture surface and more secondary cracks. All these served to improve the fatigue crack growth resistance, which attributed largely to the effects of crack closure. Moreover, secondary cracks grew primarily along the α/β interfaces for the basket-weave microstructure but directly went across the colony-type lamellar (α+β) phase and the primary α phase without obvious regularity for the bimodal microstructure.

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Section: Resultssupporting

confidence: 93%

Fatigue Crack Growth Behaviors in Novel TC32 Titanium Alloy with Bimodal and Basket-Wave Microstructures

Zhi

Wang

et al. 2019

MSF

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“…Depending on different thermo-mechanical processes, a number of microstructure characteristics including phase morphology and grain size can be achieved to significantly adapt mechanical properties [6][7][8]. The FCP property, which offers the most fundamental data for the damage-tolerant design of the component, has been demonstrated to be strongly dependent on the microstructure and stress ratio by many researchers [9][10][11][12][13]. As for the effect of the stress ratio, it is believed that a higher stress ratio leads to a lower threshold stress intensity as well as a larger crack growth rate, and the corresponding mechanisms are rationalised largely by crack closure arguments.…”

Section: Introductionmentioning

confidence: 99%

Investigation on fatigue crack propagation behaviour of novel TiZr-based alloy

Yue

et al. 2021

Materials Science and Technology

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Fatigue crack propagation behaviour of a novel TiZr-based alloy with two different microstructures was studied at room temperature. The measurements at increasing stress intensity factor range were conducted with loading ratios of 0.1 and 0.6. Based on the measurements, it is found that the alloy with the lamellar microstructure shows fatigue striations and secondary cracks. As to the equiaxed microstructure, many facets are generated instead of striations. Compared with the two cases, the alloy with the lamellar structure exhibits a better resistance to fatigue crack propagation, and the resistance increases with a decrease of stress ratio for both microstructures. Combined with electron backscatter diffraction analysis, the lower crack propagation rate of the lamellar microstructure can be ascribed to crack bifurcation and striation growth.

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“…Meanwhile, getting deeper insights into the mechanisms involved during crack propagation in relation with the microstructure can help achieve these requirements while contributing to optimization of the material processing. It is well established that the change from a bimodal microstructure, composed of nodules and lamellae colonies, to a fully lamellar microstructure leads to a significant improvement in crack propagation resistance [1][2][3][4][5]. This improvement is explained by the more tortuous path of the crack through the microstructure and a higher roughness of the crack surface, leading to slower macroscopic crack propagation rates [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Identification of Relationships between Heat Treatment and Fatigue Crack Growth of αβ Titanium Alloys

Renon

Gardin

Larignon

et al. 2019

Metals

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This study deals with the influence of microstructure on the fatigue crack growth resistance of αβ titanium alloys: Ti-6Al-4V ELI (Extra Low Interstitial) that may compete with the conventional Ti-6Al-4V alloy in the manufacture of high performance aircraft. Six different microstructures have been considered: the as-received bimodal microstructures and five distinct fully lamellar microstructures. The characteristic parameters of these microstructures were determined and crack growth tests were performed with crack closure measurements in order to evaluate the shielding effect induced by closure. A comparison of crack growth rates, fracture surfaces, and crack path was carried out for the different microstructures. The results outline a transition between two propagation regimes from a microstructure-sensitive to microstructure-insensitive propagation.

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Influence of Microstructure and Stress Ratio on Fatigue Crack Growth in a Ti-6-22-22-S alloy

Cited by 8 publications

References 12 publications

Fatigue Crack Growth Behaviors in Novel TC32 Titanium Alloy with Bimodal and Basket-Wave Microstructures

Fatigue Crack Growth Behaviors in Novel TC32 Titanium Alloy with Bimodal and Basket-Wave Microstructures

Investigation on fatigue crack propagation behaviour of novel TiZr-based alloy

Identification of Relationships between Heat Treatment and Fatigue Crack Growth of αβ Titanium Alloys

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