VHCF behaviour of case-hardened specimens made of two grades of steel SAE 5120 differing in microstructure

Bomas, H.; Burkart, Klaus; Zoch, H.‐W.

doi:10.1016/j.ijfatigue.2012.10.001

Cited by 10 publications

(6 citation statements)

References 21 publications

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“…The effect of this was restriction of the initiation sites to the bottom corners of the specimen. The fact that, for carburized specimens, the initiation sites are rather found in the interior is confirmed by [8,12] where surface initiations were observed only on specimens with a relatively high stress concentration factor, K t .…”

Section: Discussionmentioning

confidence: 76%

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20 kHz 3-point bending fatigue of automotive steels

et al. 2018

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The 20 kHz load frequency enables fatigue tests for very high cycle fatigue life, 109-1013 cycles, within conveniently short time. In automotive applications, many components are subjected to flexural loading and hence bending fatigue is an important test mode. Ultrasound fatigue test instruments have been used successfully in several assessments of fatigue strength and more commonly in uniaxial loading. Here, a 3-point bending fatigue test rig operating in resonance at 20 kHz load frequency has been designed to test plane specimens at R=0.1 loading. The test rig design and stress calculations are presented. Testing for fatigue strength was conducted using the staircase method with 15 specimens of each steel grade, specimens reaching 108 cycles were considered run-outs giving fatigue strength at 108 cycles. Additional 15 specimens of each grade were tested for S-N curves with the upper limit above 109 cycles. Two different common automotive steels, 38MnSiV5, a micro-alloyed ferritic-pearlitic steel, and 16MnCr5, a carburizing martensitic steel, were tested. The fatigue strengths achieved from the staircase testing are 340 and 419 MPa stress amplitudes for the 38MnSiV5 and 16MnCr5 steels, respectively. The S-N curves of the steels appear to be quite flat in the tested life range 107 – 109.

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Section: Discussionmentioning

confidence: 76%

“…In another study, Bomas et al [8] have analysed the VHCF behaviour of 20MnCr5-steel grade with two different carburizing heat treatments yielding one superclean (nearly free of oxides) and one with normal content of non-metallic inclusions. The carburized layer depth (case-hardened depth, CHD) is 0,7 mm.…”

Section: Introductionmentioning

confidence: 99%

20 kHz 3-point bending fatigue of automotive steels

et al. 2018

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“…It indicates that the VHCF property can be improved through optimizing BQ-P-T process parameters and subsequent microstructures. Furthermore, the ratio of σ w9 /R m of BQ200 sample is much higher than that of conventional high strength tempered martensitic steels (~0.3-0.4) [30][31]. Here, it suggests that the film-like RA (Fig.2e-f) plays a significant role on the enhanced VHCF property of BQ200 sample.…”

Section: S-n Characteristicsmentioning

confidence: 79%

“…Therefore, the VHCF property of BQ200 sample is improved compared with BQ320 variant. Furthermore, the ratio of σ w9 /R m (0.55) of BQ200 sample is much higher than that of conventional high strength tempered martensitic steels (~0.3-0.4) [30][31].…”

Section: Crack Initiation: the Role Of Retained Austenitementioning

confidence: 84%

Very high cycle fatigue behaviors of bainite/martensite multiphase steel treated by quenching-partitioning-tempering process

Gao

Zhang

Cheng

et al. 2016

International Journal of Fatigue

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“…[1][2][3] The geometric features of particles are key variables in modelling the damage evolution of both corrosion and fatigue crack growth in materials, 4 and as such, their statistical modelling is of great importance. [5][6][7][8][9] In the present research, a multimodal cumulative distribution function (cdf) for which the underlying modes are charaterized by a three-parameter Weibull cdf is shown to successfully model the distribution of particles larger than 6.0 μm 2 (to ensure accuracy in area measurement for optical imaging at 20×) in both unstressed and fatigue-damaged 7075-T6 aluminium alloys, based on eight samples (one common alloy and seven teardown samples from retired military airplane outer wing panels). The purpose of this paper is to analyse the extensive sets of data obtained via microscopy using multimodal statistical modelling methods, as well as to statistically characterize particle induced fatigue crack lengths.…”

Section: Introductionmentioning

confidence: 99%

Statistical characterization of the geometric properties of particles in 7075‐T6 aluminium alloy

Haden

Harlow

2014

Fatigue Fract Eng Mat Struct

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Corrosion in aluminium alloys is initiated and sustained at constituent particles within the metal matrix via a localized galvanic process. These particles are also known to play a critical role in fatigue crack initiation and growth. Consequently, statistical characterization of particle geometrical features is critical when modelling corrosion and fatigue. A key statistic is particle size distribution, which was extensively modelled here via imaging of unstressed and fatigued 7075‐T6 aluminium alloys. Fatigued samples were obtained from the outer wing panels of teardown specimens from retired military aircraft. The purpose of this effort was therefore to analyse extensive sets of particle geometry data obtained via microscopy using advanced multimodal statistical modelling and to appropriately characterize the properties of constituent particles and fatigue cracks found in these specimens. The resulting distribution functions for the underlying modes are assumed to be three‐parameter Weibull distribution functions.

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VHCF behaviour of case-hardened specimens made of two grades of steel SAE 5120 differing in microstructure

Cited by 10 publications

References 21 publications

20 kHz 3-point bending fatigue of automotive steels

20 kHz 3-point bending fatigue of automotive steels

Very high cycle fatigue behaviors of bainite/martensite multiphase steel treated by quenching-partitioning-tempering process

Statistical characterization of the geometric properties of particles in 7075‐T6 aluminium alloy

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