Very High Cycle Fatigue Resistance of the Low Alloyed Steel 42CrMo4 in Medium- and High-Strength Quenched and Tempered Condition

Lang, Karl‐Heinz; Korn, M.; Rohm, Thomas

doi:10.1016/j.prostr.2016.06.145

Cited by 11 publications

(14 citation statements)

References 25 publications

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“…Fatigue tests are needed for safe design against gigacycle fatigue, especially when very high strength steels are considered. Indeed, for a given steel depending of the quenched and tempered conditions, a critical hardness value seems to exist above which the VHCF strength decreases . This seems to be due to the key role of defects (inclusions).…”

Section: Effect Of Microstructural and Mechanical Features On The Vhcmentioning

confidence: 99%

“…Indeed, for a given steel depending of the quenched and tempered conditions, a critical hardness value seems to exist above which the VHCF strength decreases. 83 This seems to be due to the key role of defects (inclusions). However, Equation 2 is useful for engineers to assess the magnitude order of the VHCF resistance as proposed by Brand et al in HCF regime.…”

Section: Influence Of the Maximum Tensile Strengthmentioning

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: Effect Of Microstructural and Mechanical Features On The Vhcmentioning

confidence: 99%

Section: Influence Of the Maximum Tensile Strengthmentioning

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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“…The martensitic zone forms the typical lens shape. Due to the thermal gradient in the work piece, the grain structure near the surface is coarse and gets finer in the depth, which is typical for laser hardening [11,31]. After the temperature profile is discussed based on the thermal simulation, the results of the metallurgical investigations will now be presented.…”

Section: Resultsmentioning

confidence: 99%

Optimization of the Laser Hardening Process by Adapting the Intensity Distribution to Generate a Top-hat Temperature Distribution Using Freeform Optics

2017

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Laser hardening is a surface hardening process which enables high quality results due to the controllability of the energy input. The hardened area is determined by the heat distribution caused by the intensity profile of the laser beam. However, commonly used top-hat laser beams do not provide an ideal temperature profile. Therefore, in this paper the beam profile, and thus the temperature profile, is optimized using freeform optics. The intensity distribution is modified to generate a top-hat temperature profile on the surface. The results of laser hardening with the optimized distribution are thereupon compared with results using a top-hat intensity distribution.

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“…For the following tests specific assumptions are necessary: For the used steel in this study AlCaO oxides which have a globular shape are typically responsible for crack initiation [12]. It is assumed, that the shape of these inclusions is ideal spherical and that they are detached from the metallic matrix [13].…”

Section: Figmentioning

confidence: 99%

The influence of tension mean stress to the crack initiation process at the very high cycle fatigue regime for a high strength steel

2018

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Abstract. Strain controlled tests were performed on a high strength steel to investigate the influence of tension mean stress to the crack initiation process at the very high cycle fatigue regime. It is supposed that the variation of stress the state in the vicinity of a non-metallic inclusion results in a change to the energy transferred to the surrounding metallic matrix. To prove this, incremental step tests on cylindrical specimen were realized in which the tension mean stress was stepwise increased. It could be verified that the hysteresis area, which is a criterion of the work transferred to the specimen, decreases with increasing tension mean stress. The test results provide a reasonable physical model to estimate the influence of tension mean stress to the crack initiation process in the very high cycle fatigue regime.

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Very High Cycle Fatigue Resistance of the Low Alloyed Steel 42CrMo4 in Medium- and High-Strength Quenched and Tempered Condition

Cited by 11 publications

References 25 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

Optimization of the Laser Hardening Process by Adapting the Intensity Distribution to Generate a Top-hat Temperature Distribution Using Freeform Optics

The influence of tension mean stress to the crack initiation process at the very high cycle fatigue regime for a high strength steel

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