Effect of small scale notches on the very high cycle fatigue of AISI 310 stainless steel

Khan, Muhammad Kashif; Liu, Y.J.; Wang, Hongtao; Pyoun, Young-Sik

doi:10.1111/ffe.12229

Cited by 6 publications

(15 citation statements)

References 33 publications

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“…The disappearance of the conventional fatigue limit (Fig. ), as has been defined by fatigue testing up to 10 7 cycles, is a matter of great concern for many researchers . A topic of intense debate has been the mechanism leading to fatigue fracture of high‐strength steels in the very‐high‐cycle fatigue (VHCF) regime, most of which originates from the non‐metallic inclusions at the sub‐surface.…”

Section: Introductionmentioning

confidence: 99%

Dominant factors for very‐high‐cycle fatigue of high‐strength steels and a new design method for components

Matsunaga

Sun

et al. 2015

Fatigue Fract Eng Mat Struct

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A B S T R A C T Dominant factors affecting fatigue failure from non-metallic inclusions in the very-highcycle fatigue (VHCF) regime are reviewed, and the mechanism for the disappearance of the conventional fatigue limit is discussed. Specifically, this paper focuses on the following: (i) the crucial role of internal hydrogen trapped by non-metallic inclusions for the growth of the optically dark area (around the non-metallic inclusion at fracture origin), (ii) the behaviour of the crack growth from a non-metallic inclusion as a small crack and (iii) the statistical aspects of the VHCF strength, in consideration of the maximum inclusion size, using statistics of extremes. In addition, on the basis of the aforementioned findings, a new fatigue design method is proposed for the VHCF regime. The design method gives the allowable stress, σ allowable , for a determined design life, N fD , as the lower bound of scatter of fatigue strength, which depends on the amount of components produced.Keywords bearing steel; non-metallic inclusion; small crack; the ffiffiffiffiffiffiffiffi ffi area p parameter model; very-high-cycle fatigue. N O M E N C L A T U R Effiffiffiffiffiffiffiffi ffi area p = square root of the area of crack or defect ffiffiffiffiffiffiffiffi ffi area p ODA = square root of the area of ODA ffiffiffiffiffiffiffiffi ffi area p max = maximum inclusion size ffiffiffiffiffiffiffiffi ffi area p max;j = maximum inclusion size in the j th inspected area or volume C H = hydrogen content F j = cumulative distribution function HV = Vickers hardness value j = integer number (=1, 2, 3…) n = number of inspections N = number of loading cycles N f = number of loading cycles to failure N fD = design life R = stress ratio S = area for prediction S 0 = standard inspection area T = return period V = volume for prediction V 0 = standard inspection volume y = reduced variate y j = j th reduced variate γ = growth ratio of ODA (¼ ffiffiffiffiffiffiffiffi ffi area p ODA = ffiffiffiffiffiffiffiffi ffi area p max ) σ allowable = allowable design stress

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Section: Introductionmentioning

confidence: 99%

Dominant factors for very‐high‐cycle fatigue of high‐strength steels and a new design method for components

Matsunaga

Sun

et al. 2015

Fatigue Fract Eng Mat Struct

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“…It should be noted that the fatigue notch sensitivity q is variable with both K t and R. Since these selected data under R=−1 in refs. [14,27,[29][30][31][32][33][34][35][36][37][38][39][40][41][42] were measured with different K t , the q under the identical condition of K t =4 (Fig. 8) has to be calculated by the Kuhn-Hardrath equation [25]:…”

Section: Comparison Of Fatigue Notch Properties With Other Metallic Mmentioning

confidence: 99%

“…Comparing fatigue notch sensitivity and strength-modulus ratio of Ti2448 alloy with other metallic materials, including Mg alloys [30], Al alloys [31][32][33], Ti alloys [27,29,[34][35][36][37][38] and steels [14,[39][40][41][42]. modulus β type biomedical titanium alloys are potential for load-bearing applications to ensure long-term service safety because they are tolerant to notch, as evidenced by the decreased q of the α, (α+β) and β type alloys under the identical σ/E ratio.…”

Section: Figurementioning

confidence: 99%

Weak fatigue notch sensitivity in a biomedical titanium alloy exhibiting nonlinear elasticity

et al. 2017

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It is well known that metallic materials exhibit worse fatigue damage tolerance as they behave stronger in strength and softer in modulus. This raises concern on the long term safety of the recently developed biomechanical compatible titanium alloys with high strength and low modulus. Here we demonstrate via a model alloy, Ti-24Nb-4Zr-8Sn in weight percent, that this group of multifunctional titanium alloys possessing nonlinear elastic deformation behavior is tolerant in fatigue notch damage. The results reveal that the alloy has a high strength-to-modulus (σ/E) ratio reaching 2% but its fatigue notch sensitivity (q) is low, which decreases linearly from 0.45 to 0.25 as stress concentration factor increases from 2 to 4. This exceeds significantly the typical relationship between σ/E and q of other metallic materials exhibiting linear elasticity. Furthermore, fatigue damage is characterized by an extremely deflected mountain-shape fracture surface, resulting in much longer and more tortuous crack growth path as compared to these linear elastic materials. The above phenomena can be explained by the nonlinear elasticity and its induced stress relief at the notch root in an adaptive manner of higher stress stronger relief. This finding provides a new strategy to balance high strength and good damage tolerance property of metallic materials.

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“…The grains were equiaxed and found to have a random orientation. Carbide precipitates were obtained on the grain boundaries of the material …”

Section: Materials and Experimental Detailsmentioning

confidence: 99%

“…The S–N curve of the material showed a substantial improvement in the fatigue life in all specimens. The alloy showed surface cracking up to 10 9 cycles before the UNSM treatment . However, the UNSM‐treated specimens showed subsurface cracking beyond 10 7 cycles.…”

Section: Introductionmentioning

confidence: 97%

Effect of ultrasonic nanocrystal surface modification on the characteristics of AISI 310 stainless steel up to very high cycle fatigue

Khan

Liu

Wang

et al. 2016

Fatigue Fract Eng Mat Struct

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Effect of Ultrasonic Nanocrystal Surface Modification on theshowed a higher fatigue life improvement. The fatigue life improvement was higher in crack initiation from the surface of specimens. The subsurface crack initiation depth in the alloy increased with increase in the fatigue failure cycles. It was concluded that UNSM treatment can increase the life of the alloy significantly up to very high cycle fatigue.

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Effect of small scale notches on the very high cycle fatigue of AISI 310 stainless steel

Cited by 6 publications

References 33 publications

Dominant factors for very‐high‐cycle fatigue of high‐strength steels and a new design method for components

Dominant factors for very‐high‐cycle fatigue of high‐strength steels and a new design method for components

Weak fatigue notch sensitivity in a biomedical titanium alloy exhibiting nonlinear elasticity

Effect of ultrasonic nanocrystal surface modification on the characteristics of AISI 310 stainless steel up to very high cycle fatigue

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