Effects of SMAT at cryogenic and room temperatures on the kink band and martensite formations with associated fatigue resistance in a β-metastable titanium alloy

Maurel, Pierre; Weiss, Laurent; Bocher, Philippe; Grosdidier, Thierry

doi:10.1016/j.msea.2020.140618

Cited by 33 publications

(11 citation statements)

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“…It is worth mentioning that, similar to surface failure, a small number of secondary cracks can be observed on the fracture surface of interior failure except for room temperature conditions. Although the secondary cracks have little effect on the fatigue failure mechanism, 50 their appearance makes the primary crack surface more complex. During the growth of the primary crack, the secondary crack is formed as a result of the stress concentration at the crack tip 37 .…”

Section: Resultsmentioning

confidence: 99%

High cycle and very high cycle fatigue properties and microscopic crack growth modeling of Ti‐6.5Al‐3.5Mo‐1.5Zr‐0.3Si titanium alloy at elevated temperatures

Yuan

et al. 2022

Fatigue Fract Eng Mat Struct

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Pulsating tension fatigue tests were conducted at 25 C, 150 C, and 250 C to investigate the effect of temperature on high cycle and very high cycle fatigue behavior of titanium alloy. The fatigue strength decreases with the increase of temperature, and the surface failure is more sensitive to temperature than interior failure. Afterwards, the fatigue fracture morphology, microstructure, and texture of titanium alloy were characterized. The results show that the fracture of larger α p phase with the maximum shear stress and higher strain concentration is responsible for the facet formation. The formation of facets leads to the interior failure at different temperatures. Finally, combining with the definition of interior crack growth rate, an assessment approach was proposed to predict the crack growth rate within the inhomogeneous microstructure area (IMA), which takes crack growth acceleration caused by the increase of temperature into consideration. K E Y W O R D Selevated temperature effect, interior failure mechanism, micro-crack growth rate, titanium alloy, very high cycle fatigue

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Section: Resultsmentioning

confidence: 99%

High cycle and very high cycle fatigue properties and microscopic crack growth modeling of Ti‐6.5Al‐3.5Mo‐1.5Zr‐0.3Si titanium alloy at elevated temperatures

Yuan

et al. 2022

Fatigue Fract Eng Mat Struct

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“…Maurel et al. [ 307 ] associated fatigue performance of a β ‐metastable titanium alloy with the surface kink band and martensite produced by the SMAT technology at room and cryogenic temperatures (CT). Figure 25g shows the IPF mapping extracted from the EBSD testing.…”

Section: Fatigue Enhancement Methodsmentioning

confidence: 99%

Review on Fatigue of Additive Manufactured Metallic Alloys: Microstructure, Performance, Enhancement, and Assessment Methods

Liu,

Yu,

Guo

et al. 2023

Advanced Materials

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Additive manufacturing (AM), which is a process of building objects in a layer‐upon‐layer fashion from designed models, has received unprecedented attention from research and industry because it offers outstanding merits of flexibility, customization, reduced buy‐to‐fly ratio, and cost‐effectiveness. However, the fatigue performance of safety‐critical industrial components fabricated by AM is still far below that obtained from conventional methods. This review discusses the microstructural heterogeneities, randomly dispersed defects, poor surface quality, and complex residual stress generated during the AM process that can negatively impact the fatigue performance of as‐printed parts. The difference in microstructural origin of fatigue failure between conventionally manufactured and printed metals is reviewed with particular attention to the effects of the trans‐scale microstructures on AM fatigue failure mechanisms. Various methods for mitigating the fatigue issue, including pre‐process, inter‐process and post‐process treatments, are illustrated. Empirical, semi‐empirical and microstructure‐sensitive models are presented to predict fatigue strength and lifetime. Summary and outlooks for future development of the fatigue performance of AM materials are provided.This article is protected by copyright. All rights reserved

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“…[1][2][3][4][5][6][7][8] Among them, austenitic stainless steels have been widely studied. [9][10][11][12][13][14][15][16][17] However, conflicting results concerning the efficiency of these surface treatments to improve the fatigue life were observed and reported when specific treatment conditions were employed, [18][19][20][21] thus showing that the treatment parameters are sometimes critical and need to be wisely chosen in order to provide the desired enhancement in fatigue properties. Due to the importance of fatigue crack initiation in the fatigue life, such reduction of the fatigue limit is often attributed to the surface roughness and characteristic surface damage induced by the treatment.…”

Section: Introductionmentioning

confidence: 99%

Modeling of the fatigue behavior of functionally graded materials: Study of the residual stresses induced by surface severe plastic deformation

Dureau,

Arzaghi,

Grosdidier

et al. 2023

Fatigue Fract Eng Mat Struct

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A new finite elements approach has been used to model the evolution of residual stresses during cyclic loading in functionally graded 316 L stainless steel, obtained by surface severe plastic deformation. The affected layer modeling was divided in two stages: the compressive residual stress state initialization and the update of the mechanical properties characteristic of the gradient microstructure determined from local characterization. The capacity of the model to simulate both the strain‐ and stress‐controlled fatigue behavior was evaluated, and a good consistency between the numerical and experimental results was obtained. Numerical residual stress fields were compared to the experimental measurements, and a very good agreement was observed. A mean error of approximately 65 MPa over all the compared data was measured. Especially, the relaxed and inverted residual stress gradient after the different testing conditions were nicely retrieved, indicating the capabilities of the newly proposed model.

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Effects of SMAT at cryogenic and room temperatures on the kink band and martensite formations with associated fatigue resistance in a β-metastable titanium alloy

Cited by 33 publications

References 50 publications

High cycle and very high cycle fatigue properties and microscopic crack growth modeling of Ti‐6.5Al‐3.5Mo‐1.5Zr‐0.3Si titanium alloy at elevated temperatures

High cycle and very high cycle fatigue properties and microscopic crack growth modeling of Ti‐6.5Al‐3.5Mo‐1.5Zr‐0.3Si titanium alloy at elevated temperatures

Review on Fatigue of Additive Manufactured Metallic Alloys: Microstructure, Performance, Enhancement, and Assessment Methods

Modeling of the fatigue behavior of functionally graded materials: Study of the residual stresses induced by surface severe plastic deformation

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