Influence of carburizing and nitriding on failure of gears – A case study

Boniardi, Marco; D’Errico, Fabrizio; Tagliabue, Chiara

doi:10.1016/j.engfailanal.2005.02.021

Cited by 57 publications

(31 citation statements)

References 12 publications

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“…A thin hard case may be better than too thick one because when the thickness of the nitrided layer increases the depth of the zone interested by compressive residual stresses becomes greater. These must be balanced; close to the case-core interface, by residual tensile stresses [12]. In turn Genel and Demirkol [15] reported that the fatigue strength of carburized AISI 8620 steel, with a core hardness of 300 HV, increasing with increased hardened case depth up to the critical limit value of 0.12.…”

Section: Materials Requirements For Steel Gearmentioning

confidence: 99%

“…Such differences in the same material are achieved by the use of thermal and thermochemical surface treatments. For this reason, gears are often surface hardened by nitriding [12]. Nitriding is performed on quenched and tempered steel, and can be conducted at temperature lower than tempering itself, therefore not involving microstructural changes.…”

Section: Materials Requirements For Steel Gearmentioning

confidence: 99%

See 1 more Smart Citation

On the Durability of the Hydraulic Satellite Motor Working Mechanism in Overload Condition

Szkodo

Stanisławska

Śliwiński

2016

Advances in Materials Science

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The paper presents the newest construction of the hydraulic satellite pump/motor. In this study, the fracture of the hydraulic satellite motor working mechanism is investigated. Factors influencing the durability of satellite working mechanism have been described. The durability of the hydraulic satellite motor working mechanism at a load, corresponding to a pressure of 15 MPa supplied with refined rapeseed oil is very low. Analyses of construction and laboratory tests showed that the satellites teeth wear out the fastest. Results showed that bending fatigue and surface contact fatigue of the satellites are the main cause of the hydraulic satellite motor working mechanism failures.

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Section: Materials Requirements For Steel Gearmentioning

confidence: 99%

Section: Materials Requirements For Steel Gearmentioning

confidence: 99%

On the Durability of the Hydraulic Satellite Motor Working Mechanism in Overload Condition

Szkodo

Stanisławska

Śliwiński

2016

Advances in Materials Science

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show abstract

“…However, the modelling process and performance analysis of carburized gears were not described in detail. Some scholars [7,8] observed the microstructure properties of carburized gears to find the initiation and extension of damage; however, this method is only applicable to some specific materials and conditions. Yamanaka et al [9] used four different manufacturing methods for spur gears and found that forging is the best way to increase bending stress of carburized gears.…”

Section: State Of the Artmentioning

confidence: 99%

Meshing Simulation and Strength Calculation of a Carburized Gear Pair

Li¹,

Zhang²,

Wnag³

2017

Int. j. simul. model.

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The material in the carburized layer of a carburized gear is nonlinear. However, no systematic theory and method is available to analyse the strength of nonlinear materials; thus, calculating the exact strength of carburized gears is difficult. The traditional method of calculating the strength of carburized gears considered the material as uniform, which is susceptible to make errors. To address this problem, a hierarchical simulation method was proposed to calculate the strength of carburized gears. The strength calculation principle of carburized gears was first analysed. Then, a solid modelling method of carburized gears was presented based on the extraction technology of the layered homogeneous material. Finally, the meshing process of carburized gears was simulated, and the distribution and variation laws of the root, contact, and shear stresses during the meshing process were determined accurately. Results show that the shear stress of carburized gears initially increases and then decreases along with depth direction, and the maximum value appears in the surface below. However, the shear stress of non-carburized gears decreases linearly. The equivalent stress of the two kinds of gears decreases linearly with depth direction, whereas the decreasing amplitude of the carburized gears is larger than that of the non-carburized gears. A significant error in the calculation of the strength of carburized gears can be clearly observed using the traditional method. By selecting the appropriate parameters, the method proposed in this study can be used to simulate the meshing process of the carburized gear pair and calculate its strength accurately.

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“…로의 요구가 증대되고 있다 [1][2][3][4][5][6][7][8][9] . 특히 고강도 재료의 표 면특성을 향상시켜 필요한 기계적인 특성을 얻을 수 있 는 표면처리법이 매우 중요시되고 있다 7,8,13) .…”

Section: 서 론unclassified

VHCF Characteristics of SCMH2 Steel Depending on the Surface Treatment Conditions

Suh¹,

Suh²,

Suh³

2013

Journal of Welding and Joining

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SCMH2 steel is widely used in the industrial members of car and tractor. This study focused on material properties and evaluation technology of the SCMH2 steel regarding the surface treatment followed by carburizing and nitriding, by means of impact test, hardness test. and fatigue test including HCF (high cycle fatigue) and VHCF (very high cycle fatigue). Drop weight impact tester (Instron, 9250 Hv) and Cantilever type rotating-bending fatigue tester (YRB200, 3150 rpm) were used to characterize the SCMH2 standard specimen before and after carburizing/nitriding. In order to understand those effects on fatigue characteristics and material properties, the fractured surfaces were carefully observed and analyzed by SEM (scanning electron microscope) and EDS (energy-dispersive X-ray spectroscopy).

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Influence of carburizing and nitriding on failure of gears – A case study

Cited by 57 publications

References 12 publications

On the Durability of the Hydraulic Satellite Motor Working Mechanism in Overload Condition

On the Durability of the Hydraulic Satellite Motor Working Mechanism in Overload Condition

Meshing Simulation and Strength Calculation of a Carburized Gear Pair

VHCF Characteristics of SCMH2 Steel Depending on the Surface Treatment Conditions

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