Effects of case depth, face width and intergranular oxidation on bending fatigue strength of case-carburized SNC815 and SCM415 steel spur gears

Effects of Side-Face Carburizing, Face Width, Tempering and Intergranular Oxidation on Bending Fatigue Strength of Case-Carburized Gear

Volume 8: Mechanics of Solids, Structures and Fluids ◽

10.1115/imece2012-86492 ◽

2012 ◽

Author(s):

Kouitsu Miyachika ◽

Norimasa Maeta

Keyword(s):

Fatigue Strength ◽

Hardened Layer ◽

Case Depth ◽

Bending Fatigue ◽

Face Width ◽

Intergranular Oxidation ◽

Bending Fatigue Test ◽

Side Face ◽

Bending Fatigue Strength ◽

Carburized Gear

The hardness measurements of hardened layer, the observation of intergranular oxidation with the SEM and the bending fatigue test for gas and vacuum case-carburized spur gears were carried out, and then profiles of hardened layer, case depth, amount of intergranular oxidation and S-N curves were obtained. Effects of the case depth, the side-face carburizing, the face width, the tempering and the intergranular oxidations on the bending fatigue strength were determined.

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S1103-3-2 Effects of Gear-Side Carburizing, Face Width and Interglanular Oxidation on Bending Fatigue Strength of Case-Carburized Spur Gears

The proceedings of the JSME annual meeting ◽

10.1299/jsmemecjo.2010.4.0_105 ◽

2010 ◽

Vol 2010.4 (0) ◽

pp. 105-106

Author(s):

Kouitsu MIYACHIKA ◽

Shinji KAYAMA ◽

Takao KOIDE ◽

Hidefumi MADA

Keyword(s):

Fatigue Strength ◽

Spur Gears ◽

Bending Fatigue ◽

Face Width ◽

Bending Fatigue Strength

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Residual Stress and Bending Fatigue Strength of Case-Carburized Thin-Rimmed Spur Gears With Asymmetric Web Arrangement

Volume 7: 10th International Power Transmission and Gearing Conference ◽

10.1115/detc2007-34047 ◽

2007 ◽

Author(s):

Kouitsu Miyachika ◽

Wei-Dong Xue ◽

Takao Koide ◽

Hidefumi Mada ◽

Kengo Nojima ◽

...

Keyword(s):

Residual Stress ◽

Fatigue Strength ◽

Three Dimensional ◽

Spur Gear ◽

Fatigue Tests ◽

Case Depth ◽

Spur Gears ◽

3D Fem ◽

Bending Fatigue ◽

Bending Fatigue Strength

This paper presents a study on effects of carburized parts on residual stress and bending fatigue strength of case-carburized thin-rimmed spur gears with asymmetric web arrangement. A heat conduction analysis and an elastic-plastic stress analysis for the case-carburizing process of thin-rimmed spur gears with asymmetric web arrangement were carried out by the three-dimensional finite-element method (3D-FEM), and then residual stresses were obtained. Effects of the case depth, the carburized part and the rim thickness on the residual stress of case-carburized thin-rimmed spur gears were determined. Bending fatigue tests were carried out for case-carburized thin-rimmed spur gears with asymmetric web arrangement, and S-N curves and bending fatigue limit loads were obtained. Effects of the case-depth, the carburized part and the rim thickness on the bending fatigue strength of the case-carburized thin-rimmed spur gear with asymmetric web arrangement were determined.

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Bending fatigue strength and impact strength of spur gears with various surface hardening treatments

The Proceedings of Conference of Chugoku-Shikoku Branch ◽

10.1299/jsmecs.2021.59.05a1 ◽

2021 ◽

Vol 2021.59 (0) ◽

pp. 05a1

Author(s):

Ryo ASAKURA ◽

Kohei HIBI ◽

Kenichi SAKAMOTO ◽

Toshiyasu OMURA ◽

Ryosuke NISHI ◽

...

Keyword(s):

Fatigue Strength ◽

Impact Strength ◽

Surface Hardening ◽

Spur Gears ◽

Bending Fatigue ◽

Bending Fatigue Strength

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The Evaluation of Bending Fatigue Testing of Austempered Ductile Iron Spur Gear

Volume 10: 2019 International Power Transmission and Gearing Conference ◽

10.1115/detc2019-97194 ◽

2019 ◽

Author(s):

Qi Zhang ◽

Jianhua Lv ◽

Rizwanulhaque Syed ◽

Jing Zhang ◽

Yang Xu ◽

...

Keyword(s):

Fatigue Strength ◽

Ductile Iron ◽

Fatigue Testing ◽

Spur Gear ◽

Austempered Ductile Iron ◽

Spur Gears ◽

Reliability Design ◽

Bending Fatigue ◽

Bending Fatigue Strength ◽

Number Of Cycles

Abstract An experimental evaluation of bending fatigue strength for austempered ductile iron (ADI) spur gears have been performed using Zwick fatigue tester. The gear material was manufactured by vertically continuous casting, in which the radius of the graphite grains is smaller. The Stress-Number of Cycles curve (S-N curve) for the bending fatigue strength of the ADI spur gears are manufactured without any specific surface treatments, and have been obtained by post-processing software. It was observed that when the reliability was 50%, the fatigue limit was 304.89 MPa. It has provided a reliable basis to rate the reliability design of the small gearboxes in automation later.

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Tooth Root Bending Fatigue Strength of High-Density Sintered Small-Module Spur Gears: The Effect of Porosity and Microstructure

Metals ◽

10.3390/met9050599 ◽

2019 ◽

Vol 9 (5) ◽

pp. 599 ◽

Cited By ~ 1

Author(s):

Vigilio Fontanari ◽

Alberto Molinari ◽

Michelangelo Marini ◽

Wolfgang Pahl ◽

Matteo Benedetti

Keyword(s):

Fatigue Strength ◽

Surface Defect ◽

Detrimental Effect ◽

Case Hardening ◽

Spur Gears ◽

Tooth Root ◽

Near Surface ◽

Bending Fatigue ◽

Microstructural Constituent ◽

Bending Fatigue Strength

The present paper is aimed at investigating the effect of porosity and microstructure on tooth root bending fatigue of small-module spur gears produced by powder metallurgy (P/M). Specifically, three steel variants differing in powder composition and alloying route were subjected either to case-hardening or sinter-hardening. The obtained results were interpreted in light of microstructural and fractographic inspections. On the basis of the Murakami a r e a method, it was found that fatigue strength is mainly dictated by the largest near-surface defect and by the hardness of the softest microstructural constituent. Owing to the very complicated shape of the critical pore, it was found that its maximum Feret diameter is the geometrical parameter that best captures the detrimental effect on fatigue.

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