Description of fatigue crack growth in steel structural components using energy approach - Influence of the microstructure on the FCGR

Kucharski, Paul; Lesiuk, Grzegorz; Szata, M.

doi:10.1063/1.4965950

Cited by 10 publications

(5 citation statements)

References 10 publications

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“…The microstructures of 41Cr4 steel (HT4, HT5, HT6) are typical (martensite, troostite, sorbite) for this type of steel and proposed quenching temperatures (Nayar, 2007), the hardness and static tensile test results were adopted from works (Kucharski et al, 2016) (Kotowski, 2006) 5 with characteristic dimensions W, a, B as well with the applied force F. For 42CrMo4 steel, the characteristic dimensions were the following: W ¼ 50 mm; B ¼ 8 mm; and initial crack, a ¼ 14 mm (including notch and pre-crack length). For 41Cr4 steel, the CT specimen's dimensions are the following: the W ¼ 48 mm; B ¼ 18 mm; and, initial crack a/W ¼ 0.25.…”

Section: Fatigue Crack Growthmentioning

confidence: 99%

Fatigue crack growth of 42CrMo4 and 41Cr4 steels under different heat treatment conditions

Lesiuk

Duda

Correia

et al. 2018

IJSI

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Purpose For nowadays construction purposes, it is necessary to define the life cycle of elements with defects. As steels 42CrMo4 and 41Cr4 are typical materials used for elements working under fatigue loading conditions, it is worth to know how they will behave after different heat treatment. Additionally, typical mechanical properties of material (hardness, tensile strength, etc.) are not defining material’s fatigue resistance. Therefore, it is worth to compare, except mechanical properties, microstructure of the samples after heat treatment as well. The paper aims to discuss these issues. Design/methodology/approach Samples of normalized 42CrMo4 (and 41Cr4) steel were heat treated under three different conditions. All heat treatments were designed in order to change microstructural properties of the material. Fatigue tests were carried out according to ASTM E647-15 standard using compact tension specimens. Later on, based on obtained results, coefficients C and m of Paris’ Law for all specimens were estimated. Similar procedure was performed for 41Cr4 steel after quenching and tempering in different temperatures. Findings The influence of heat treatment on the fatigue crack growth rates (42CrMo4, 41Cr4 steel) has been confirmed. The higher fatigue crack growth rates were observed for lower tempering temperatures. Originality/value This study is associated with influence of microstructural properties of the material on its’ fatigue fracture. The kinetic fatigue fracture diagrams have been constructed. For each type of material (and its heat treatment), the Paris law constants were determined.

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Section: Fatigue Crack Growthmentioning

confidence: 99%

Fatigue crack growth of 42CrMo4 and 41Cr4 steels under different heat treatment conditions

Lesiuk

Duda

Correia

et al. 2018

IJSI

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“…Since fatigue crack initiation and growth is one of the significant causes of structural failure in engineering applications, there is a considerable demand for steels with high fatigue strength in the industry [1,2]. SAE4140 quenched and tempered steel is one of the most favorable steels for applications involving cyclic loading due to its high fatigue strength [3].…”

Section: Introductionmentioning

confidence: 99%

Comparison of the Internal Fatigue Crack Initiation and Propagation Behavior of a Quenched and Tempered Steel with and without a Thermomechanical Treatment

Khayatzadeh

Guth

Heilmaier

2022

Metals

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Previous studies have shown that a thermomechanical treatment (TMT) consisting of cyclic plastic deformation in the temperature range of dynamic strain aging can increase the fatigue limit of quenched and tempered steels by strengthening the microstructure around non-metallic inclusions. This study considers the influence of a TMT on the shape, size and position of crack-initiating inclusions as well as on the internal crack propagation behavior. For this, high cycle fatigue tests on specimens with and without TMT were performed at room temperature at a constant stress amplitude. The TMT increased the average lifetime by about 40%, while there was no effect of the TMT on the form or size of critical inclusions. Surprisingly, no correlation between inclusion size and lifetime could be found for both specimen types. There is also no correlation between inclusion depth and lifetime, which means that the crack propagation stage covers only a small portion of the overall lifetime. The average depth of critical inclusions is considerably higher for TMT specimens indicating that the strengthening effect of the TMT is more pronounced for near-surface inclusions. Fisheye fracture surfaces around the critical inclusions could be found on all tested specimens. With increasing fisheye size, a transition from a smooth to a rather rough and wavy fracture surface could be observed for both specimen types.

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“…Recently, several damage hypothesis rules have been developed based on strain energy density parameters. 17,[44][45][46][47][48] However, an effective and robust multiaxial fatigue life criterion is still lacking for engineering components, and further studies on multiaxial fatigue life prediction and cracking behavior modeling are expected.…”

Section: Introductionmentioning

confidence: 99%

Critical plane–based multiaxial fatigue life prediction of turbine disk alloys by refining normal stress sensitivity

Zhu

Hao

et al. 2018

The Journal of Strain Analysis for Engineering Design

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For engineering components subjected to complex multiaxial loadings, critical plane approaches like Fatemi-Socie criterion have been commonly utilized for life prediction of these components. Within the Fatemi-Socie criterion, the normal stress sensitivity parameter k is usually fitted from additional experimental data, which introduces inconvenience for practice especially under limited testing data conditions. In this regard, a simple critical plane-based damage parameter is put forward with no additional material constants, which attempts to provide a robust method for multiaxial fatigue analysis of turbine disk alloys. Using experimental datasets of TC4 and GH4169 alloys under different loadings, the proposed model provides better correlations with fatigue life of the two alloys than the models of Smith-Watson-Topper and Wang-Brown.

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Description of fatigue crack growth in steel structural components using energy approach - Influence of the microstructure on the FCGR

Cited by 10 publications

References 10 publications

Fatigue crack growth of 42CrMo4 and 41Cr4 steels under different heat treatment conditions

Fatigue crack growth of 42CrMo4 and 41Cr4 steels under different heat treatment conditions

Comparison of the Internal Fatigue Crack Initiation and Propagation Behavior of a Quenched and Tempered Steel with and without a Thermomechanical Treatment

Critical plane–based multiaxial fatigue life prediction of turbine disk alloys by refining normal stress sensitivity

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