Comparison of the Effects of Carbides and Nonmetallic Inclusions on Formation of Fatigue Microcracks in Steels

Глотка, А. А.; Мороз, А. Н.

doi:10.1007/s11041-019-00456-5

Cited by 10 publications

(5 citation statements)

References 2 publications

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“…The fatigue life of the bearing roller is 2,684,523 times. According to the ratio of the bearing inner ring rotation cycle and the rolling element revolution cycle, the bearing life N z is calculated, as shown in equation (16). The bearing life is 740,928 revolutions.…”

Section: Bearing Fatigue Life Prediction Methodsmentioning

confidence: 99%

“…It was found that different inclusions made different contributions in different fatigue periods through the experiment of three kinds of bearing steel. In 2019, Glotka and Moroz 16 analysed the influence of carbide and non-metallic inclusions on the formation of fatigue cracks in 11KH18MSHD, R6M5 and E1347 bearing steels by experiments. They pointed out that the extent of fatigue crack growth is affected by the size of carbides, the proportion of the carbides containing fatigue cracks in steel increases with the size increases, and microcracks are more likely to appear in non-metallic inclusions.…”

Section: Introductionmentioning

confidence: 99%

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A method for predicting subsurface fatigue life of rolling bearings based on macro–micro coupling model

Chang¹,

Chen²,

Liu³

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part J:

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The fatigue life of the bearing can be predicted effectively by combining the multifield coupling condition of the working process with the internal microstructure. In this paper, a bearing fluid lubrication model is established based on the computational fluid dynamics method, and the calculation result is coupled to the thermal-solid model by the grid mapping method. Through this method, a bearing thermal-fluid-solid multifield coupling dynamics model is established to obtain the evolution information of bearings. Simultaneously, the micro-characterization experiments of SKF6406 bearing (M50 bearing steel) were carried out by electron backscatter diffraction, scanning electron microscope and nano-indentation. The microstructure model of bearing containing micro-inclusions was established by the Voronoi method. On this basis, the microscopic stress distribution characteristics and the motion law of bearing microstructure under the multifield coupling action are solved. In the end, the fatigue life prediction method of rolling bearing was established.

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Section: Bearing Fatigue Life Prediction Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A method for predicting subsurface fatigue life of rolling bearings based on macro–micro coupling model

Chang¹,

Chen²,

Liu³

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part J:

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“…APT is an excellent approach to mapping H at precipitates; see the detailed discussion in Section . The coherent, semi-coherent, or incoherent types of precipitates differ significantly in H trapping properties, as discussed by Shi et al In addition, the presence of undesired non-metallic inclusions is inevitable in steels, and their effects on H trapping and induced cracking need further investigation. − …”

Section: Knowledge Base About Hementioning

confidence: 99%

Hydrogen Embrittlement as a Conspicuous Material Challenge─Comprehensive Review and Future Directions

Yu,

Díaz,

et al. 2024

Chem. Rev.

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Hydrogen is considered a clean and efficient energy carrier crucial for shaping the net-zero future. Large-scale production, transportation, storage, and use of green hydrogen are expected to be undertaken in the coming decades. As the smallest element in the universe, however, hydrogen can adsorb on, diffuse into, and interact with many metallic materials, degrading their mechanical properties. This multifaceted phenomenon is generically categorized as hydrogen embrittlement (HE). HE is one of the most complex material problems that arises as an outcome of the intricate interplay across specific spatial and temporal scales between the mechanical driving force and the material resistance fingerprinted by the microstructures and subsequently weakened by the presence of hydrogen. Based on recent developments in the field as well as our collective understanding, this Review is devoted to treating HE as a whole and providing a constructive and systematic discussion on hydrogen entry, diffusion, trapping, hydrogen–microstructure interaction mechanisms, and consequences of HE in steels, nickel alloys, and aluminum alloys used for energy transport and storage. HE in emerging material systems, such as high entropy alloys and additively manufactured materials, is also discussed. Priority has been particularly given to these less understood aspects. Combining perspectives of materials chemistry, materials science, mechanics, and artificial intelligence, this Review aspires to present a comprehensive and impartial viewpoint on the existing knowledge and conclude with our forecasts of various paths forward meant to fuel the exploration of future research regarding hydrogen-induced material challenges.

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“…The fracture mechanics approach to the operation of turbine unit rotor shafts includes not only the correction of technological processes but also the consideration of the structural and phase composition properties [48][49][50][51][52][53][54][55][56][57][58][59][60][61].…”

Section: Literature Survey: State-of-the-artmentioning

confidence: 99%

Hydrogen Cooling of Turbo Aggregates and the Problem of Rotor Shafts Materials Degradation Evaluation

Balitskii,

Syrotyuk,

Havrilyuk

et al. 2023

Energies

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Changes in the properties of 38KhN3MFA steel, from which the rotor shaft is made, were investigated by comparing the hardness of the shaft surface and hydrogen concentration in the chips and analyzing changes in the morphology of the chips under the influence of various factors. The microstructures obtained from the surface of the rotor shaft samples are presented, and histograms reflecting the parameters of the structural components are constructed. An abbreviated diagram of the “life cycle” of the turbine rotor shaft is given. It was found that, during long-term operation (up to 250 thousand hours), the hardness of the rotor shaft surface decreases from 290 HB to 250 HB. It was recorded that, in the microstructure of the shaft during 250 thousand hours of operation, the amount of cementite decreased from 87% to 62%, and the proportion of free ferrite increased from 5% to 20%. The average values of ferrite microhardness decreased from 1.9 GPa to 1.5 GPa. An increase in the content of alloying elements in carbides was recorded: Cr and V—by 1.15–1.6 times; and Mo—by 2.2–2.8 times. With the help of the developed program (using computer vision methods), changes in their microrelief were detected to study photos of chips.

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Comparison of the Effects of Carbides and Nonmetallic Inclusions on Formation of Fatigue Microcracks in Steels

Cited by 10 publications

References 2 publications

A method for predicting subsurface fatigue life of rolling bearings based on macro–micro coupling model

A method for predicting subsurface fatigue life of rolling bearings based on macro–micro coupling model

Hydrogen Embrittlement as a Conspicuous Material Challenge─Comprehensive Review and Future Directions

Hydrogen Cooling of Turbo Aggregates and the Problem of Rotor Shafts Materials Degradation Evaluation

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