On the critical inclusion size of high strength steels under ultra-high cycle fatigue

Yang, Zhi; Zhang, J.M.; Li, S.X.; Li, G.Y.; Wang, Hongtao; Wang, Hui; Weng, Yuqing

doi:10.1016/j.msea.2006.04.068

Cited by 102 publications

(53 citation statements)

References 10 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: 58%

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: 58%

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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“…One of the major reasons is that the interior crack cannot be observed and measured during the experiment. Furthermore, from the viewpoint of safety design, the reliability of steel components in actual service can be affected by the maximum sizes of defects contained in a certain bearing volume of steel [13][14][15][16]. How to reliably evaluate the maximum defect size, and then to predict the fatigue strength corresponding to a certain fatigue life, has been a key problem which researchers have to face.…”

Section: Introductionmentioning

confidence: 99%

High Cycle Fatigue Property of Carburized 20Cr Gear Steel under Axial Loading

Liu

Nehila

et al. 2016

Metals

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Abstract:The high cycle fatigue property of carburized 20Cr gear steel was experimentally investigated under axial loading with a stress ratio of zero. The test results show that this steel exhibits gradually decreasing S-N characteristics, and the fatigue strength corresponding to 10 9 cycles is about 455 MPa. Based on the observation of fracture surfaces, the interior inclusion fisheye-induced fracture is the predominant fracture mode in the life regime beyond 10 5 cycles. The fine granular area (FGA) cannot be found clearly around the inclusion. Based on the evaluation of stress intensity factor ranges (∆K) at the front of inclusion and fisheye, the interior crack growth rate (da/dN) equation can be characterized by da/dN = 2.39 × 10 −21 (∆K) 12.32 . Corresponding to the tested specimen, the predicted maximum inclusion size is about 52.02 µm. The predicted fatigue strength corresponding to 10 9 cycles by using Wang's model is slightly higher than the experimental result, but that by using Murakami's model is relatively conservative.

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“…In steels, inclusions are frequent crack-initiation sites and their size usually exceeds the length scale of the fine martensitic microstructures by tens of microns, with particle sizes ranging from 1 to 75 lm. [24][25][26][27][28] Fracture mechanics considerations dictate that there is a critical size below which particles will not initiate a crack. [29] The critical size varies with the alloy system, microstructure, and imposed stress level, among other things, but is in the range of 1 to 15 lm [26,27] for steels.…”

Section: Further Discussionmentioning

confidence: 99%

Effect of Yttrium on the Fatigue Behavior of Investment-Cast and Wrought Ti-6Al-4V

Pilchak

Williams

2009

Metall Mater Trans A

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The effect of yttrium (Y)-containing particles on the microstructure and fatigue behavior of investment-cast and hot isostatically pressed (HIP) Ti-6Al-4V has been investigated. Elemental Y was added to the Ti-6Al-4V melt to obtain a concentration of 200 ppm Y, which is 4 times the amount allowed by current industrial specifications. The observed particles were between 100 nm and 1 lm in diameter, were widely dispersed, and did not agglomerate. High-cycle fatigue tests were conducted and an extensive fractography study revealed that the effect of the particles was negligible compared to the large colony size, and therefore slip length, in the cast material. The fatigue lives were consistent with those in the literature for tests conducted on specimens containing standard concentrations of Y. A section of the casting was extruded to refine the grain size in order to study the effects of the particles on a microstructure with shorter slip lengths. The results of the fractography study on these specimens were not as straightforward. A fine particle was observed at the crack-initiation site of one of the specimens of extruded material and shallow depressions on the size scale of the particles were present in other samples. However, no evidence of Y was detected by energy-dispersive spectroscopy (EDS) and the fatigue lives were on the high end of the scatter band typically encountered in wrought and annealed Ti-6Al-4V.

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On the critical inclusion size of high strength steels under ultra-high cycle fatigue

Cited by 102 publications

References 10 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

High Cycle Fatigue Property of Carburized 20Cr Gear Steel under Axial Loading

Effect of Yttrium on the Fatigue Behavior of Investment-Cast and Wrought Ti-6Al-4V

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