Fatigue strength and failure mechanisms in the VHCF-region for quenched and tempered steel 42CrMoS4 and consequences to fatigue design

Pyttel, Brita; Schwerdt, Daniela; Berger, Christina

doi:10.1016/j.proeng.2010.03.144

Cited by 20 publications

(12 citation statements)

References 4 publications

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“…The fatigue test specimens were of hourglass type with a diameter of 3 and 6 mm at the minimum cross section corresponding, respectively, to tests at 20 kHz with an ultrasonic testing machine and at 120 Hz with an electromagnetic one. The same method applied to the fatigue data in Pyttel et al 40 gives the same conclusion (Figure 15). This shows that the size effect has to be taken into account when comparing fatigue tests results obtained under different loading frequencies.…”

Section: Figure 12supporting

confidence: 52%

“…In this section, the S‐N curves of steels are described in connection with their “shape.” Thus, we distinguish between very high strength steels (the tensile strength is higher than 1100 MPa) and low strength steels. Indeed, the S‐N curves of some low‐strength steels can show a horizontal asymptote that could be named “fatigue limit” up to the tested life (10 9 or 10 10 cycles) at least. Notwithstanding this, nobody can guarantee that testing a specimen or component up to 10 11 cycles will not break it.…”

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

confidence: 99%

“… S‐N diagrams for 42CrMoS4 steel in tension compression loading (R = −1) from Pyttel et al [Colour figure can be viewed at wileyonlinelibrary.com]…”

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

confidence: 99%

“…Overall, for high strength steels under tension-compression loading at 20 kHz, the fatigue strength at 10 9 cycles, in terms of stress amplitude, varies from 600 to 1000 MPa. It depends on the specific treatment undergone to the material 2,15,17,36,37,39,40,49,5142,[52][53][54] (Table 2). Furthermore, different studies show that for the high strength steels, the difference between the fatigue strength at 10 6 and 10 9 cycles is ranging from 50 to 200 MPa.…”

Section: S-n Curve Characteristics Of High Strength Steelsmentioning

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: Figure 12supporting

confidence: 52%

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

confidence: 99%

“… S‐N diagrams for 42CrMoS4 steel in tension compression loading (R = −1) from Pyttel et al [Colour figure can be viewed at wileyonlinelibrary.com]…”

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

confidence: 99%

Section: S-n Curve Characteristics Of High Strength Steelsmentioning

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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“…From Lang et al it can be seen that the alternating fatigue strength

σ_{D, W}

decreases at a high stimulation frequency for quenched and tempered steel. Likewise, fatigue tests with different load frequencies are described by Pyttel et al, where higher lifetimes occur at lower frequencies. However, it should be noted that in the two studies the test frequencies are set to

f_{1} = 50

Hz and

f_{2} = 1

kHz and

f_{1} = 185

Hz and

f_{2} = 20

kHz, respectively.…”

Section: Introductionmentioning

confidence: 99%

Frequency Dependent Fatigue Strength Investigations on Tempered Steel and Nodular Cast Iron

Thumann

Marburg

Meinhardt

et al. 2019

steel research int.

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This paper presents experimental fatigue tests on specially shaped specimens made from quenched and tempered steel 42CrMoS4 and nodular cast iron EN-GJS-600-3. The specimens are geometrically designed to resemble actual subcomponents of forming and cutting dies for sheet metal manufacturing. These subcomponents have failed in the past.Experiments are carried out using a fictive load-time function, which is a modification of an actually measured load curve and has variable mean and amplitude values. This first test series serves as a general validation of a subsequent fatigue analysis. A second test series is carried out with constant mean and amplitude values with a load ratio R % 0. Here, the load frequencies in the individual test runs are varied between f ¼ 5 Hz and f ¼ 45 Hz in order to investigate the influence of the frequency. Both series are performed on a servo-hydraulic testing machine.The experimental data is then statistically evaluated. The values for the scatter correlate with data from the literature. The data from the test series with the fictive load-time function can thus be used for subsequent validation of a fatigue calculation, which will be addressed in a future publication. Most significant are the findings from the second series of experiments with varied load frequencies, as a significant frequency influence could be detected. Furthermore, the hardening and softening behavior under cyclic loading and the fracture behavior of the materials are analyzed and compared with data from the literature.

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Effect of Ti Treatment on MnS Inclusion and Mechanical Property of a High‐Strength Sulfur‐Containing Steel

Gao,

Jiao,

Zhu

et al. 2024

steel research int.

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The effect of Ti treatment on MnS inclusions and mechanical properties of a high‐strength sulfur‐containing steel is systematically investigated. The inclusions are mainly composed of pure MnS, TiN–MnS composite inclusion, cuboidal pure TiN with sharp corner and Ti4C2S2 after Ti treatment. Ti treatment had a good refining effect on MnS inclusions. With the increase of Ti content, the number of pure MnS with elongated shape decreased, while the number of shorter TiN–MnS composite inclusions increased. When the Ti treatment is higher than 0.031 wt%, the number of pure TiN and Ti4C2S2 increases. With the increase in Ti content, the strength increases significantly and the elongation decreases slightly. The highest strength is obtained when the Ti content is 0.031 wt%. A novel mechanism of MnS shape control by Ti treatment is proposed. Ti treatment can be applied in other steels containing MnS inclusions to improve the mechanical property.

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Fatigue strength and failure mechanisms in the VHCF-region for quenched and tempered steel 42CrMoS4 and consequences to fatigue design

Cited by 20 publications

References 4 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

Frequency Dependent Fatigue Strength Investigations on Tempered Steel and Nodular Cast Iron

Effect of Ti Treatment on MnS Inclusion and Mechanical Property of a High‐Strength Sulfur‐Containing Steel

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