Influence of cycling frequency and testing volume on the VHCF properties of 18Ni maraging steel

Fitzka, M.; Pennings, Bert; Karr, Ulrike; Schönbauer, Bernd M.; Schuller, R.; Tran, Minh-Duc; Mayer, H.

doi:10.1016/j.engfracmech.2019.106525

Cited by 15 publications

(14 citation statements)

References 27 publications

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“…Fatigue tests were performed with thin sheets made of 18Ni maraging steel with nitrided surfaces [ 16 ]. The chemical composition was (in% mass): Ni 18, Co 5, Mo 5, Al 1, Cr 1 and Fe (balance).…”

Section: Methodsmentioning

confidence: 99%

“…Since such high numbers of cycles can only be reached with a high-frequency testing technique, ultrasonic fatigue has become a widely used testing technique for VHCF investigations of high-strength steels. An investigation into frequency influences on fatigue properties of high-strength steels was performed with 18Ni maraging steel [16]. Figure 6 shows fatigue data of maraging steel sheet specimens obtained in three testing series: large specimens (testing volume 260 mm 3 ) tested at 95 Hz, small specimens (testing volume 3.4 mm 3 ) tested at 95 Hz, and small specimens tested at 20 kHz.…”

Section: Steelsmentioning

confidence: 99%

“…Figure 6 shows fatigue data of maraging steel sheet specimens obtained in three testing series: large specimens (testing volume 260 mm 3 ) tested at 95 Hz, small specimens (testing volume 3.4 mm 3 ) tested at 95 Hz, and small specimens tested at 20 kHz. An investigation into frequency influences on fatigue properties of high-strength steels was performed with 18Ni maraging steel [16]. Figure 6 shows fatigue data of maraging steel sheet specimens obtained in three testing series: large specimens (testing volume 260 mm 3 ) tested at 95 Hz, small specimens (testing volume 3.4 mm 3 ) tested at 95 Hz, and small specimens tested at 20 kHz.…”

Section: Steelsmentioning

confidence: 99%

“…Figure16. Fatigue data of a quasi-unidirectional glass fibre-reinforced polymer measured at load ratio R = 0.1 with servo-hydraulic equipment at 10 Hz and ultrasonic equipment at 20 kHz; reprinted with permission from Elsevier[85].…”

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confidence: 99%

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Usability of Ultrasonic Frequency Testing for Rapid Generation of High and Very High Cycle Fatigue Data

et al. 2021

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Ultrasonic fatigue testing is an increasingly used method to study the high cycle fatigue (HCF) and very high cycle fatigue (VHCF) properties of materials. Specimens are cycled at an ultrasonic frequency, which leads to a drastic reduction of testing times. This work focused on summarising the current understanding, based on literature data and original work, whether and how fatigue properties measured with ultrasonic and conventional equipment are comparable. Aluminium alloys are not strain-rate sensitive. A weaker influence of air humidity at ultrasonic frequencies may lead to prolonged lifetimes in some alloys, and tests in high humidity or distilled water can better approximate environmental conditions at low frequencies. High-strength steels are insensitive to the cycling frequency. Strain rate sensitivity of ferrite causes prolonged lifetimes in those steels that show crack initiation in the ferritic phase. Austenitic stainless steels are less prone to frequency effects. Fatigue properties of titanium alloys and nickel alloys are insensitive to testing frequency. Limited data for magnesium alloys and graphite suggest no frequency influence. Ultrasonic fatigue tests of a glass fibre-reinforced polymer delivered comparable lifetimes to servo-hydraulic tests, suggesting that high-frequency testing is, in principle, applicable to fibre-reinforced polymer composites. The use of equipment with closed-loop control of vibration amplitude and resonance frequency is strongly advised since this guarantees high accuracy and reproducibility of ultrasonic tests. Pulsed loading and appropriate cooling serve to avoid specimen heating.

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Section: Methodsmentioning

confidence: 99%

Section: Steelsmentioning

confidence: 99%

Section: Steelsmentioning

confidence: 99%

mentioning

confidence: 99%

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Usability of Ultrasonic Frequency Testing for Rapid Generation of High and Very High Cycle Fatigue Data

et al. 2021

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“…Generally, 90% risk‐volume have been considered in the literature 17,24,25,34–48 . However, a 95% risk‐volume has been used in Fitzka et al, 49 and in Furuya, 34 VHCF failures have been found for defects outside the 90% risk‐volume, in particular for applied stresses equal to 83% and 88% of the maximum stress. In the latter case, the 90% risk‐volume provides a smaller, thus nonconservative, estimate of the volume to be considered for quantifying size effects.…”

Section: Introductionmentioning

confidence: 99%

Very high cycle fatigue life and critical defect size: Modeling of statistical size effects

Paolino

2021

Fatigue Fract Eng Mat Struct

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A novel statistical approach to model size effects in very high cycle fatigue (VHCF) is proposed in the paper. The statistical distributions of the VHCF life and of the size of the defect leading to VHCF failure (critical defect) are identified in the paper through the weakest‐link principle. The statistical distributions are able to account for the stress gradients that are present in a loaded material volume. An efficient procedure for estimating the parameters involved in the statistical distributions is also shown. The proposed statistical models are finally validated through experimental data taken from the literature. The experimental validation proves the fitting capability of the proposed models that outperform the traditional models based on the 90% risk‐volume.

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Influence of reverted austenite on fatigue life of 18 % nickel maraging steel

Rohit,

Rao M

2023

Materialwissenschaft Werkst

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Maraging steels containing 18 % nickel are based on a low‐carbon iron‐nickel‐cobalt‐molybdenum system. These steels demonstrate a remarkable combination of high strength and high toughness. To investigate the effect of overaging and resulting austenite reversion on the fatigue behavior of C250 maraging steel, specimens in the solution annealed state were overaged at 510 °C for various intervals, resulting in volume fractions of reverted austenite ranging from 2.6 % to 11.4 %. The staircase method was used to calculate the fatigue limit. S−N curves were generated by testing a minimum of four stress levels and at least three samples at each stress level. Basquin's equation was used to fit the experimental stress‐life data, and the Basquin exponent and fatigue strength coefficient were calculated. The presence of 2.6 % reverted austenite in the microstructure improved the fatigue limit and fatigue ratio, without significantly reducing tensile strength. The results can be interpreted in terms of reverted austenite having a crack blunting effect on the propagating cracks. A small amount of reverted austenite in the range of 2 %–3 % vol has a beneficial effect on the fatigue life.

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Influence of cycling frequency and testing volume on the VHCF properties of 18Ni maraging steel

Cited by 15 publications

References 27 publications

Usability of Ultrasonic Frequency Testing for Rapid Generation of High and Very High Cycle Fatigue Data

Usability of Ultrasonic Frequency Testing for Rapid Generation of High and Very High Cycle Fatigue Data

Very high cycle fatigue life and critical defect size: Modeling of statistical size effects

Influence of reverted austenite on fatigue life of 18 % nickel maraging steel

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