Effect of retained austenite on the contact fatigue strength of carburized steel

Vinokur, B. B.; Kondratyuk, S. E.; Markovskaya, L. I.; Khrunik, R. A.; Gurmaza, A. A.; Vainerman, V. B.

doi:10.1007/bf00713758

Cited by 7 publications

(1 citation statement)

References 1 publication

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“…It can be noted that dissolution of carbides are envisaged at higher austenitizing temperatures, leading to depinning of grain boundaries. Similarly, decreasing the austenite transformation temperature of the steel with given carbon content will lend to smaller size of carbide precipitates besides increasing the number density of the carbides [6,7]. In addition, dislocation density increases with decreasing transformation temperature, primarily due to the greater strain accompanying the transformation and because there is very possibility for the dislocations to be annealed out during the shorter time of transformation.…”

Section: Scanning Electron Microscopymentioning

confidence: 99%

Effect of Carbonitriding on Endurance Life of Ball Bearing Produced from SAE 52100 Bearing Steels

Rajan¹,

Joshi²,

Ghosh³

2013

JSEMAT

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The present paper reports the unusual enhancement of endurance life of ball bearings subjected to carbonitriding treatment. The microstructure was characterized by scanning electron microscopy and correlated with hardness and X-ray diffraction analysis. Endurance tests at 90% reliability revealed that the carbonitrided bearings exhibit nearly ten times more life than the non-carbonitrided bearings. This is attributed to synergic combination of retained austenitic, fine martensitic microstructure and ultrafine carbide precipitates obtained by carbonitriding treatment.

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Section: Scanning Electron Microscopymentioning

confidence: 99%

Effect of Carbonitriding on Endurance Life of Ball Bearing Produced from SAE 52100 Bearing Steels

Rajan¹,

Joshi²,

Ghosh³

2013

JSEMAT

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Alternative microstructures and their influence on mechanical properties of case-hardened gears

Guntner

Tobie

Stahl

2017

Forsch Ingenieurwes

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Material influence on mechanical properties of gears with alternative microstructures

Blech

Guntner

Schurer³

et al. 2023

Forsch Ingenieurwes

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Case hardening represents the most important heat treatment process to increase the load carrying capacity of gear components. Beside predominantly martensitic surface layers with low proportion of retained austenite, there were investigated material structures with differing properties in preceding research work.In a previous publication, the results of three variants made of the material 20MnCr5, which is typically used for gears, were presented. The reference heat treatment was a conventional carburizing with subsequent case hardening. The second variant was also gas carburized, but with a high proportion of retained austenite. The last presented variant had a bainitic structure in the surface layer. The second and the third variant showed a similar tooth root bending strength compared to the reference. The numbers of the pitting resistance were significantly higher than for the reference variant.This paper presents the results of further investigations on the influence of different microstructures on the gear load carrying capacity. For this purpose, gears made of 18CrNiMo7‑6 were tested with regard to their load carrying capacity. 18CrNiMo7‑6 is a case hardening steel like 20MnCr5, too, which is often applied in big gear components. The tooth root bending strength was approximately constant, whereas the pitting resistance decreased compared to the corresponding variants of the material 20MnCr5. In comparison to the carburized 20MnCr5 reference variant, only the 18CrNiMo7‑6 variant with a large proportion of retained austenite showed a higher pitting resistance.The tooth root bending strength investigations took place in the cycle regime of limited life as well in the high cycle fatigue regime. The pitting resistance was only determined in the cycle regime of limited life.

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Effect of retained austenite on the contact fatigue strength of carburized steel

Cited by 7 publications

References 1 publication

Effect of Carbonitriding on Endurance Life of Ball Bearing Produced from SAE 52100 Bearing Steels

Effect of Carbonitriding on Endurance Life of Ball Bearing Produced from SAE 52100 Bearing Steels

Alternative microstructures and their influence on mechanical properties of case-hardened gears

Material influence on mechanical properties of gears with alternative microstructures

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