Core microstructure-dependent bending fatigue behavior and crack growth of a case-hardened steel

Farivar, H.; Novokshanov, Denis; Richter, Silvia; Lenz, David; Bleck, Wolfgang; Prahl, Ulrich

doi:10.1016/j.msea.2019.138040

Cited by 12 publications

(5 citation statements)

References 39 publications

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“…As it described in [6], even a one cycle heating to 850 °C and cooling to the room temperature leads to a decrease of the fatigue strength. A similar result can be found in [23]; in this case, a multiple heating cycle to 950 °C was carried out. As a result, it was found that the number of microcracks increased.…”

Section: Methodssupporting

confidence: 77%

High temperature wear assessment of mining machines operating tools

Gromyka

Kremcheev

2020

E3S Web Conf.

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Mining is widely associated with the use of a variety of mining machines for various duties, such as extraction, loading and transportation of rock. Due to prolonged use of machines, the amount of wear of operating tools and machine parts increases. This problem is especially acute for mining and loading machines used in excavation and reclamation, because the wear rate is increased on those duties. The development of wear process and evaluation of the residual life of operating tools of mining and loading machines is well studied in world practice. However, given the variety of climatic, geological and mining conditions, unique for each mineral deposit, we are facing difficulties in creating a comprehensive model of wear process development. In modern researches on this area such issues as estimation of operating tools residual life during intense wear under extreme conditions of high temperatures and sharp temperature drop are understudied. These conditions are typical for deposits of such minerals as coal and peat, which are especially prone to spontaneous combustion. This review discusses methods for assessing various wear mechanisms and the effect of temperature on the intensity of those processes, as well as methods to determine the residual life of operating tools of mining and loading machines working in high-temperature environment.

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Section: Methodssupporting

confidence: 77%

High temperature wear assessment of mining machines operating tools

Gromyka

Kremcheev

2020

E3S Web Conf.

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“…The results showed that the hardness difference is linear from the outer surface of the model to the inside in the core of the model. In [10], the microstructure was studied on the growth of fatigue cracking of the carbonized models, and the results showed that the samples with a microstructure containing martensitic have better resistance to the growth of fatigue crack progression than those samples containing in the microstructure ferrite. Authors in [11] combined the scanning electron microscope images and Photoshop software, then the conversion rate between pixels and actual length of scale were calculated, after that the cracks parameters were known by pixel.…”

Section: Introductionmentioning

confidence: 99%

The Influence of Repeated Heat Treatments on The Propagation of Fatigue Cracking of Medium Carburized Steel

Karash

2023

JMechE

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The issue of metal fatigue emerged as one of the major issues in a variety of engineering designs, and the design engineers were forced to take metals' fatigue resistance into account. In this paper, multiple quenching mediums and varied heat treatments were utilized to examine the effects of various heat treatments on the development of fatigue cracking in steel. The model that was carburized, quenched in distilled water and tempered before being quenched once more in distilled water and tempered a second time had the best outcomes, the fewest cycles needed to cause the model to fail, and a correlation between the rate of fatigue crack propagation and the length of the crack, according to the results. Additionally, the analytical findings demonstrated that this model, as opposed to models with fixed stress intensity factors, has a fatigue crack growth rate. The model that was carburized, quenched in coolant, then tempered and quenched again without performing the tempered appearance failed very rapidly. The high rate of the stress intensity factor with fatigue crack propagation is shown by the data analysis. The results show a reduction in the growth amount tendency of fatigue crack in the linear region mode-III.

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“…These beneficial enhancements are mainly ascribed to the introduction of a surface layer with much higher hardness and compressive residual stress. Farivar et al [ 16 ] found that the carburized 20MoCr4 steel with bainite/martensite core structure has better fatigue properties than carburized 20MoCr4 steel with ferrite core structure. In addition, the bainite/martensite structure resists fatigue crack growth more effectively than ferrite.…”

Section: Introductionmentioning

confidence: 99%

Effect of Minor Carburizing on Microstructure and Mechanical Properties of M50 Bearing Steel

Shen

Wei

et al. 2022

steel research int.

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Herein, by using scanning electron microscopy, transmission electron microscope, X‐ray diffraction, residual stress analyzer, and mechanical‐property tests, the effect of minor carburizing on the microstructure and mechanical properties of M50 steel is studied. It is shown in the results that after minor carburizing, the austenite content in the surface layer of the quenched M50 steel increases, while the martensite content and the hardness decrease. After tempering, the retained austenite in the surface layer is transformed into martensite, and a large amount of uniformly distributed carbides are precipitated. The hardness of the surface layer increases to exceed that of the core region in the steel. After the minor carburizing, there is a carbon concentration gradient between the surface layer and the core region of the M50 steel, which influences the phase transformation behavior and the residual stress state in the surface layer during the tempering process. Minor carburizing increases the rotational bending fatigue limit of the steel by 16.7% and improves the tensile strength, yield strength, and impact absorption energy of the steel.

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Core microstructure-dependent bending fatigue behavior and crack growth of a case-hardened steel

Cited by 12 publications

References 39 publications

High temperature wear assessment of mining machines operating tools

High temperature wear assessment of mining machines operating tools

The Influence of Repeated Heat Treatments on The Propagation of Fatigue Cracking of Medium Carburized Steel

Effect of Minor Carburizing on Microstructure and Mechanical Properties of M50 Bearing Steel

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