Very high cycle fatigue of nitrided 18Ni maraging steel sheet

Mayer, H.; Schuller, R.; Fitzka, M.; Tran, Duc Hoan; Pennings, Bert

doi:10.1016/j.ijfatigue.2014.02.003

Cited by 24 publications

(26 citation statements)

References 37 publications

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“…Several explanations have been proposed for explaining the formation of this specific feature of the fracture surface in the VHCF regime . These are hydrogen embrittlement‐assisted cracking caused by hydrogen that is trapped by the inclusions, fracture of boundaries between spherical carbide particles and matrix, or the formation of a fine granular layer by polygonisation and debonding between inclusion and matrix .…”

Section: From High Cycle Fatigue (Hcf) To Very High Cycle Fatigue (Vhmentioning

confidence: 99%

“…Relevant sum up of the progress of ultrasonic fatigue testing machines and devices in the recent 30 years in order to test specimens in VHCF regime is given in Bathias . Exhaustive description of the different test devices in VHCF under tension‐compression and rotating bending loadings under constant or variable amplitudes exists in many other articles …”

Section: Effect Of the Loading Conditions On The Vhcf Resistance Of Smentioning

confidence: 99%

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A review about the effects of structural and operational factors on the gigacycle fatigue of steels

Jeddi

Palin‐Luc

2018

Fatigue Fract Eng Mat Struct

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It is well‐known that the high cycle fatigue (HCF) strength of steel components is influenced by a lot of factors depending on both material, loading (including environment), specimen or component geometry (design), and manufacturing process. Based on a literature review of a lot of experimental data, a synthesis is proposed in this paper to discuss the effect of the structural and operational factors on the very high cycle fatigue (VHCF) characteristics of steels. HCF and VHCF regimes are distinguished in terms of failure mechanisms and S‐N curve shapes for high and low strength steels. Then, the effect of the microstructural and mechanical features on the VHCF resistance is debated as different parameters (microstructure, inclusion size type and depth, hydrogen, environment, maximum tensile strength, and residual stresses). Next, the influence of the loading conditions is addressed by taking into account both the frequency effect, the highly stressed volume, the loading type, and loading ratio. Finally, the influence of the testing techniques used in VHCF experiments is discussed.

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Section: From High Cycle Fatigue (Hcf) To Very High Cycle Fatigue (Vhmentioning

confidence: 99%

Section: Effect Of the Loading Conditions On The Vhcf Resistance Of Smentioning

confidence: 99%

A review about the effects of structural and operational factors on the gigacycle fatigue of steels

Jeddi

Palin‐Luc

2018

Fatigue Fract Eng Mat Struct

View full text Add to dashboard Cite

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“…Internal failures in the VHCF regime are favoured by strengthening the surface against fatigue crack initiation. Compressive residual stresses at the surface introduced by shot-peening [28,34,44], but also by heat treating [45], grinding [7] or nitriding [46], impede surface crack initiation and promote internal crack initiation. Due to prolonged crack initiation and internal crack growth in vacuum, subsurface cracking leads to extended lifetimes compared with fracturing from the surface.…”

Section: Discussionmentioning

confidence: 99%

Mean stress sensitivity of spring steel in the very high cycle fatigue regime

Schuller¹,

Karr²,

Irrasch³

et al. 2015

J Mater Sci

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The influence of load ratio on the high cycle fatigue (HCF) and very high cycle fatigue (VHCF) properties of shot-peened VDSiCr spring steel is investigated. S-N curves are measured with ultrasonic fatigue testing equipment at load ratio R = -1, R = 0.1 and R = 0.5 up to 10 10 cycles. Failures either occur below 5 9 10 6 or above 5 9 10 8 cycles. In the HCF regime cracks start exclusively at the surface. In the VHCF regime crack initiation occurs solely in the interior, at grain boundaries, inclusions or (rarely) in the matrix. The S-N curves continue to decrease beyond 10 9 cycles, most pronounced for R = -1 where the mean cyclic strength at 10 10 cycles is 5 % lower than at 10 9 cycles. VHCF strength presented in a Haigh diagram can be very well approximated with a straight line. The mean stress sensitivity factor is M = 0.47 for load ratios between R = -1 and R = 0.5.

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“…The method to test thin sheets of high-strength steels has been described in detail in previous works [12,13]. In brief, rather than vibrating in resonance, the sheet specimens ( Fig.…”

Section: Methodsmentioning

confidence: 99%

“…Hussain et al [11] reported prolonged lifetimes of 18Ni nitrided maraging steel in cyclic bending experiments for stress amplitudes where cracks initiated at the subsurface in the nitrided and at the surface in the unnitrided material. HCF and VHCF properties of three nitrided 18Ni maraging steels have been studied in previous investigations in the authors laboratory [12,13]. Fatigue cracks started exclusively in the interior at inclusions whose sizes affected fatigue lifetime and cyclic strength.…”

Section: Introductionmentioning

confidence: 99%

Influence of inclusion type on the very high cycle fatigue properties of 18Ni maraging steel

Karr¹,

Schuller²,

Fitzka³

et al. 2017

J Mater Sci

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The very high cycle fatigue (VHCF) properties of four 18Ni maraging steels were investigated. Ultrasonic fatigue tests were performed on thin sheets with nitrided surfaces at load ratio R = 0.1. Traditional maraging steel containing Ti (material A) showed crack initiation at TiN-inclusions. The elimination of Ti and the increase in Co content (material B) lead to preferential crack initiation at aluminate-inclusions. Aluminate-inclusions are less damaging than TiN-inclusions, and material B shows higher VHCF strength than material A. A further developed maraging steel (material C) with reduced Co content that is compensated for by alloying with Al showed crack initiation at aluminate-as well as at Zr(N,C)-inclusions. Zr(N,C)-inclusions are more damaging than aluminateinclusions and less damaging than TiN-inclusions. The highest VHCF strength was found for a recently developed alloy with further increased Al content (material D). In addition to inclusion-initiated fracture, this material showed shear mode crack initiation in the nitrided zone at the surface.

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Very high cycle fatigue of nitrided 18Ni maraging steel sheet

Cited by 24 publications

References 37 publications

A review about the effects of structural and operational factors on the gigacycle fatigue of steels

A review about the effects of structural and operational factors on the gigacycle fatigue of steels

Mean stress sensitivity of spring steel in the very high cycle fatigue regime

Influence of inclusion type on the very high cycle fatigue properties of 18Ni maraging steel

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