Effects of strength level and loading frequency on very-high-cycle fatigue behavior for a bearing steel

Zhao, Aiguo; Xie, Jiming; Sun, Chengqi; Lei, Zhuogui; Hong, Youshi

doi:10.1016/j.ijfatigue.2011.11.014

Cited by 94 publications

(90 citation statements)

References 37 publications

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“…For rotating bending, most of interior defects are the types of non-inclusions; only one specimen fractures from interior inclusion for RB150. With the increase of tempering temperature, inclusion initiation becomes dominant for RB150 and RB180 as are often reported in the literature [5,15,22,[27][28][29]. ΔK Inc and ΔK FGA are different from each other for the three heat treatment procedures.…”

Section: Resultsmentioning

confidence: 57%

“…Loading frequency may influence the fatigue strength of materials, and its effects differ with different microstructures. Zhao et al [5] revealed that loading frequency has little influence on specimens with higher tensile strength, whereas for the other specimens with lower tensile strength the fatigue resistance is markedly high in ultrasonic cyclic testing. Zhang et al [6] found that the higher frequency produced an upper shift of the S-N curves for superalloy IN718.…”

Section: Introductionmentioning

confidence: 99%

“…Recent studies [10,11] have confirmed the existence of fine grains in FGA. Surface defects may become non-propagating cracks [12], and sometimes grain boundary could also become a crack origin for high carbon chromium steel under low tempering temperature [5,13]. It is also revealed that fatigue crack initiation within FGA is dominated for high cycle fatigue (HCF) and VHCF, and FGA consumes more than 90% fatigue life [14,15].…”

Section: Introductionmentioning

confidence: 99%

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Effects of loading condition on very-high-cycle fatigue behaviour and dominant variable analysis

Lei

Xie

Sun

et al. 2013

Sci. China Phys. Mech. Astron.

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The specimens of a high carbon chromium steel were quenched and tempered at 150°C, 180°C and 300°C. Such specimens were tested via rotating bending and a push-pull type of axial loading to investigate the influences of loading condition on the behaviour of very-high-cycle fatigue (VHCF). Experimental results show the different influences of inclusion size on the fatigue life for the two loading conditions. Predominant factors and mechanism for the fine-granular-area (FGA) of crack origin were discussed. In addition, a reliability analysis based on a modified Tanaka-Mura model was carried out to evaluate the sensitivity of inclusion size, stress, and K FGA to the life of VHCF crack initiation.

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Section: Resultsmentioning

confidence: 57%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effects of loading condition on very-high-cycle fatigue behaviour and dominant variable analysis

Lei

Xie

Sun

et al. 2013

Sci. China Phys. Mech. Astron.

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“…It is noted that ratio of fatigue limit to tensile strength is used to reflect the fatigue strength change for specimens with different tensile strength, and this ratio tends to decrease as the tensile strength increases for this type of material [6]. In this study, the ratio of s max to s b is about 0.45 for US150, while it is about 0.40 for UL150 which has lower tensile strength.…”

Section: Effect Of Inclusion Size On Fatigue Life and Strengthmentioning

confidence: 71%

“…Around the inclusion, a characteristic rough region with fine granular area is presented, and this rough region is always surrounded by a flat region thus to form a whole ''fisheye'' morphology [6][7][8]. Due to the related observation approach, this rough area is named as optically dark area (ODA [9]), granular bright facet (GBF [10]), or fine granular area (FGA [11]) in literature.…”

Section: Introductionmentioning

confidence: 99%

Effects of inclusion size and location on very-high-cycle fatigue behavior for high strength steels

Lei

Hong

Xie

et al. 2012

Materials Science and Engineering: A

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a b s t r a c tFatigue tests with rotary bending (52.5 Hz) and ultrasonic cycling (20 kHz) methods were performed, respectively on two high strength steels so as to investigate the effects of inclusion size and location on the fatigue behavior from low cycle fatigue to very-high-cycle fatigue (VHCF) regimes. Under rotary bending test, four fracture patterns were observed with respect to different locations of inclusion on fracture surface. The mean crack growth rate within FGA (fine granular area of crack origin) was estimated to give the value with the magnitude of 10 -13 m/cycle for the specimens with the fracture pattern of ''FGA þ surface fisheye''. Under ultrasonic cycling test, the size effect of inclusions on VHCF was investigated with two groups of specimens. One is with the inclusion size between 20 and 60 mm and the other is with the inclusion size between 10 and 30 mm. The results show that large inclusions lowered the proportion of net FGA at given stress levels and led to the shortening of VHCF life. The degradation of VHCF strength caused by the increase of inclusion size is ascribed to the decrease of the critical stress of FGA formation for large inclusions.

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Fatigue Strength and Fracture Mechanisms in the Very‐High‐Cycle‐Fatigue Regime of Automotive Steels

Sadek

Bergström

Hallbäck

et al. 2020

steel research int.

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Very‐high‐cycle‐fatigue (VHCF) strength properties are of interest to several technical applications assessed globally at different laboratories with long‐life fatigue testing capabilities. Also, VHCF failure mechanisms are a scientific topic with remaining open research questions. Herein, three automotive bar grade steels are studied with respect to VHCF strength and initiation mechanisms. A microalloyed ferritic–pearlitic steel (38MnSiV5, 870 MPa tensile strength), a quenched and tempered martensitic steel (50CrV4, 1410 MPa tensile strength), and a carburizing steel (16MnCr5, 1180 MPa core structure tensile strength) are studied to reveal characteristics regarding initiation and VHCF failure mechanisms. A 20 kHz ultrasonic fatigue testing instrument is used to obtain fatigue lives up to and above 109 load cycles in uniaxial loading. Hour‐glass specimens, smooth or notched, are tested at R = −1 and R = 0.1. Fatigue strength and stress life (SN)‐diagram data are achieved, and crack initiation and growth mechanisms are studied using primarily field‐emission gun–scanning electron microscopy (FEG–SEM). Fatigue strengths are explained by a modified life‐dependent Murakami‐expression, the Haigh diagram, and notch sensitivity. Interior and surface crack initiations by surface defects, triple points, and inclusions are found. The fine granular area (FGA) to fish‐eye crack growth transition conditions are explored and schematic descriptions are given.

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Effects of strength level and loading frequency on very-high-cycle fatigue behavior for a bearing steel

Cited by 94 publications

References 37 publications

Effects of loading condition on very-high-cycle fatigue behaviour and dominant variable analysis

Effects of loading condition on very-high-cycle fatigue behaviour and dominant variable analysis

Effects of inclusion size and location on very-high-cycle fatigue behavior for high strength steels

Fatigue Strength and Fracture Mechanisms in the Very‐High‐Cycle‐Fatigue Regime of Automotive Steels

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