Surface Hardening Vs. Surface Embrittlement in Carburizing of Porous Steels

Mekonone, Samuel Tesfaye; Cristofolini, I.; Pahl, W.; Molinari, A.

doi:10.1515/pmp-2018-0003

Cited by 4 publications

(4 citation statements)

References 5 publications

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“…The material properties for the steel twin disc system (counter-face disc that is used to apply a compressive contact load and slave disk that is subjected to a contact load) are obtained for the analyses of Hertzian contact pressures and stress. The research was made using the dimensions and properties of two contacting materials where the geometry and material properties are obtained from the literature [19,20] as reported in Table 1. Radius of curvature R, mm 20 20…”

Section: Materials Property and Studied Geometrymentioning

confidence: 99%

Numeric simulation of steel twin disc system under rolling-sliding contact

Gebretsadkan Brhane,

Tesfaye Mekonone

2023

tribomat

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Various mechanical parts come into high-load rolling and sliding contact at the contact surface. Even with technological advancements, mechanical failures still occur. Rolling-sliding mechanical contact issues are the primary cause of over 90 % of surface and subsurface metallic failures and they are only becoming worse. Using discretised continuum 2D finite element methods (FEM), this research investigates the parametric contact effect of a steel twin disc system subjected to rolling-sliding contact at varied surface friction and comprehensive load condition. The equivalent von Mises stress distribution, contact pressure distribution and shift position of maximum subsurface stress on the contour region are all influenced by changes in compressive load and coefficient of friction, according to a numerical surface-to-surface contact simulation performed with Abaqus at mean Hertzian pressure. The maximal equivalent stress, for a given load, reaches a peak in the subsurface and moves farther away from the surface when the coefficient of friction decreases and comes close to the contact surface when the coefficient of friction increases. Consistency is shown by the analytical and numerical results.

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Section: Materials Property and Studied Geometrymentioning

confidence: 99%

Numeric simulation of steel twin disc system under rolling-sliding contact

Gebretsadkan Brhane,

Tesfaye Mekonone

2023

tribomat

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“…On the other hand, despite the higher temperatures allowed to carry out the plasma carburizing treatment, the control of high temperature and geometry of samples have limited the plasma-based techniques, especially for industrial applications. Thus, many authors in the literature are focused on investigating the low temperature plasma carburizing process and its implication in the hardness improvement of families of steels in correlation to the corrosion behaviour [14][15][16][17][18][19]. Most of the studies have emphasized the mechanical and tribocorrosion properties of low carbon steels after carburizing processes at low temperature.…”

Section: Introductionmentioning

confidence: 99%

Study of the Thermochemical Surface Treatment Effect on the Phase Precipitation and Degradation Behaviour of DSS and SDSS

2020

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In this study, the effect of a plasma ion carburizing process to duplex and superduplex stainless steels (DSS and SDSS), at 925 °C for a long time, as thermochemical process influencing the microstructural evolution is presented. The objective is to analyse the diffusion elements’ influence on the precipitation of secondary phases after additional short thermal treatment. A comparison among the different treatments was performed after the resulting microstructures were analysed by Field Emission—Scanning Electron Microscope. Precipitation of secondary phases—sigma (σ), chi (χ), nitrides and carbides—seemed to occur during the treatments in a similar way for both steels (DSS and SDSS), although they showed a different morphology and precipitation mode. General corrosion behaviour of untreated and treated samples was investigated by potentiodynamic tests in order to prove their corrosion resistance. It was found that an improvement of the surface protection after the plasma carburizing process occurred.

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“…A discussion on the possible surface embrittlement caused by carburising is presented in [6], where the formation of surface brittle cracks is theoretically investigated and verified by wear tests.…”

Section: Introductionmentioning

confidence: 99%

“…The same model was then refined to investigate the surface damage mechanisms in carburised pre-alloyed steels and the effect of shot peening [4,5]. A discussion on the possible surface embrittlement caused by carburising is presented in [6], where the formation of surface brittle cracks is theoretically investigated and verified by wear tests.…”

Section: Introductionmentioning

confidence: 99%

Influence of the microstructure on the subsurface and surface damage during lubricated rolling–sliding wear of sintered and sinterhardened 1.5%Mo–2%Cu–0.6%C steel: theoretical analysis and experimental investigation

Mekonone

Pahl²,

Molinari

2018

Powder Metallurgy

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The influence of the microstructure on density on the resistance to subsurface and surface damage, during lubricated rolling-sliding wear of a 1.5%Mo-2%Cu-0.65%C sintered and sinterhardened steel, was investigated. The nucleation of subsurface contact fatigue cracks and the occurrence of surface plastic deformation due to surface stresses were studied through a theoretical analysis and confirmed through wear tests. The expected positive effect of density and sinterhardening was confirmed. Moreover, the resistance of the steel to the two damage mechanisms investigated depends on the microstructural heterogeneity. The theoretical model for subsurface and for surface damage may be used to predict the resistance of the material but, depending on the distribution of the microstructural constituents, either a local or a mean approach in defining the properties of the metallic matrix has to be used.

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Surface Hardening Vs. Surface Embrittlement in Carburizing of Porous Steels

Cited by 4 publications

References 5 publications

Numeric simulation of steel twin disc system under rolling-sliding contact

Numeric simulation of steel twin disc system under rolling-sliding contact

Study of the Thermochemical Surface Treatment Effect on the Phase Precipitation and Degradation Behaviour of DSS and SDSS

Influence of the microstructure on the subsurface and surface damage during lubricated rolling–sliding wear of sintered and sinterhardened 1.5%Mo–2%Cu–0.6%C steel: theoretical analysis and experimental investigation

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