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

Lesiuk, Grzegorz; Duda, Monika; Correia, José A.F.O.; Jesus, Abílio M.P. De; Calçada, Rui

doi:10.1108/ijsi-01-2018-0003

Cited by 16 publications

(7 citation statements)

References 16 publications

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“…Sorbite is produced by hardening and high-temperature tempering. Tempering improves the structural and mechanical properties of heat-treated materials, depending on the applied temperature and cooling method [13,14]. The data presented in Table 1 confirm the above correlation.…”

Section: Resultssupporting

confidence: 68%

Effects of Friction Plate Hardness and Surface Orientation on the Frictional Properties of Cereal Grain

Kaliniewicz

Jadwisieńczak

Żuk

et al. 2020

International Journal of Food Science

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The objective of this study was to evaluate the effects of the friction plate hardness and surface orientation of a friction plate on the angle and coefficient of static friction of cereal kernels. The angle of static friction of kernels representing four major cereal species was measured on six friction plates with different hardness. The friction plates were placed in position where their surface orientation was perpendicular or parallel relative to their inclination tilt. The experimental material comprised the so-called flat seed units, where each unit consisted of three spaced kernels. The angle of static friction of every flat seed unit was measured with a dedicated device in three replications, and average values of that angle were calculated. The kernels’ angle of static friction varied considerably from 13° to 33° within the analyzed range of changes in the surface characteristics of friction plates. The average angle of static friction was influenced mainly by the surface orientation of the friction plate that came into contact with cereal kernels. The angle of static friction was 17.5% to 56.5% higher when the friction plate had perpendicular rather than parallel surface orientation. The frictional properties of kernels were less influenced by plate hardness, and clear relationships were not observed in this respect. The kernels’ coefficient of static friction remained fairly constant within the analyzed range of plate hardness values, and it was estimated at 0.4 on plates with a perpendicular surface orientation and at 0.3 on plates with a parallel surface orientation.

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Section: Resultssupporting

confidence: 68%

Effects of Friction Plate Hardness and Surface Orientation on the Frictional Properties of Cereal Grain

Kaliniewicz

Jadwisieńczak

Żuk

et al. 2020

International Journal of Food Science

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“…It was recognised that less energy is needed for crack propagation at higher temperatures, and the size of the plastic zone is much smaller. Lesiuk et al 56 and Thielen et al 57 showed for the 42CrMo4 under various heat treatments also crack growth rates for the more ductile variants, which are comparable with the high-temperature material properties of the investigated G42CrMo4.…”

Section: Influence Of Temperaturesupporting

confidence: 60%

Ultrasonic fatigue testing of cast steel G42CrMo4 at elevated temperatures

Schmiedel

Henkel

Kirste

et al. 2020

Fatigue Fract Eng Mat Struct

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The fatigue life of cast steel G42CrMo4 in two different heat treatment conditions was investigated at room temperature (RT), 473 K and 773 K up to the range of very high cycle fatigue (VHCF), that is, 109 cycles. The fatigue life is determined by casting defects, the hardness of the steel matrix and by temperature. Fatigue life data were discussed in correlation with crack‐initiating defects analysed on fracture surfaces. The SN curves obtained at RT and at 473 K show a large scatter. However, the SN curve at 773 K exhibits a larger slope parameter and a significantly reduced scatter. It is shown that the fatigue behaviour of the cast steel G42CrMo4 changes from 473 to 773 K in the range of VHCF. The fatigue lives of the specimens tested at 773 K were described with a crack growth model.

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“…Different heat treatments can result in different fatigue crack growth rates due to different hardness levels as well as different ductility. 26…”

Section: Surface Treatment and Heat Treatmentmentioning

confidence: 99%

Fracture analysis and improvement of the main shaft of wind turbine based on finite element method

Wang

Han

Wang

et al. 2018

Advances in Mechanical Engineering

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For the main shaft of wind turbine of certain type, shaft fracture occurs at the variable section of the shaft during early stage of operation. In order to validate the failure analysis, finite element analysis of the main shaft was performed. The analysis results demonstrate that there is a severe stress concentration that leads to the formation of initial cracks at variable inner diameters of the main shaft. Also, the stress in the variable part mainly resulted in the pressure of the bulging joining sleeve applied on the main shaft via the gearbox planet carrier shaft. According to the above analysis, local structure improvements were carried out through increasing the action area between the bulging joining sleeve and the main shaft. The finite element simulation results show that the stress concentration in the variable section of the improved shaft decreases significantly. The improvement of shaft strength decreases the possibility of crack formation and its growth, thus enhancing the reliability of the main shaft. This analysis process and the results of this study can provide a reference in shaft fracture analysis and also technical support for improvement in the design of wind turbine main shafts.

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

Cited by 16 publications

References 16 publications

Effects of Friction Plate Hardness and Surface Orientation on the Frictional Properties of Cereal Grain

Effects of Friction Plate Hardness and Surface Orientation on the Frictional Properties of Cereal Grain

Ultrasonic fatigue testing of cast steel G42CrMo4 at elevated temperatures

Fracture analysis and improvement of the main shaft of wind turbine based on finite element method

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