New Methodology to Evaluate the Rolling Contact Fatigue Performance of Bearing Steels With Surface Dents: Application to 32CrMoV13 (Nitrided) and M50 Steels

[+] Author and Article Information
D. Nélias

LaMCoS,  UMR CNRS 5514, INSA Lyon, France

C. Jacq

 SNECMA Moteurs, Villaroche, France

G. Lormand, A. Vincent

GEMPPM,  UMR CNRS 5510, INSA Lyon, France

G. Dudragne

 SNR Bearings, Annecy, France

J. Tribol 127(3), 611-622 (Mar 21, 2005) (12 pages) doi:10.1115/1.1924462 History: Received June 02, 2004; Revised March 21, 2005

A new methodology is proposed to evaluate the rolling contact fatigue (RCF) performance of bearing steels in presence of surface dents. The experimental procedure consists of denting the raceway of test specimens with a hardness machine using spherical diamond tips of different radii (i.e., 200, 400, and 600μm) and with an applied normal load ranging from 5to50daN. Analysis of various dent geometries yield an analytical law with five parameters useful for fitting experimental profiles for contact simulation. Fatigue tests are conducted using a two-disk machine to study the effect of different operating conditions on RCF and to compare the performances of nitrided 32CrMoV13 steel versus M50 reference steel. A numerical investigation is conducted to analyze experimental result. Initially, the local residual stresses and plastic strains around the dent are obtained through finite element simulations of the indentation process. Second, the overrolling of the dent is simulated with a contact code. Finally, an indent-based endurance limit, called H1I, is proposed and comparisons are made with test results. Both RCF tests and numerical simulations show improved performance with nitrided 32CrMoV13 steel when compared to the M50 reference steel. The dominating role of sliding is also experimentally highlighted and two areas of damage initiation are identified. The effects of normal load and hoop stress are less marked.

Copyright © 2005 by American Society of Mechanical Engineers
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Figure 20

Dimensionless pressure distribution, which results from dent profiles given in Eqs. 3,4

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Figure 21

Endurance limit H1Id found numerically for various dents in test ES1 versus experimental behavior

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Figure 1

Von Mises and microyield shear stress profiles

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Figure 3

Dent 200-10 and 400-30 at 10×106 and 50×106cycles. Operating conditions C2 (M50 disks).

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Figure 4

Location of the damaged area for driven surface in presence of sliding

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Figure 5

Dent 200-20 at 20×106cycles; effect of sliding (Nitrided 32CrMoV13)

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Figure 6

Location of damaged areas: rolling initiation zone (RIZ) and friction and rolling initiation zone (FRIZ)

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Figure 7

Stress-plastic strain curve for samples A and B

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Figure 8

FE mesh used for indentation simulation

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Figure 9

Influence of friction on the dent shape (dent 200-20, M50). Coefficient of friction f=0, 1, 10, and 50%; (a) General view and (b) zoom on the dent shoulder.

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Figure 10

Influence of friction coefficient f during indentation on contact pressure P normalized by the Hertz pressure PH (dent 200-20, M50). For clarification, the profiles f=10% and f=50% are shifted along the radial axis.

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Figure 11

Possible extrapolations of M50 hardening laws

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Figure 12

Influence of the extrapolated hardening law on the dent shape for M50: dent 200-20, f=0%

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Figure 13

Comparison between measured and simulated 200-20 dent profiles: M50 steel, Voce law, f=10%

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Figure 14

Comparison between measured and simulated 200-20 dent profiles: 32CrMoV13 steel, Voce law, f=10%

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Figure 15

Comparison of measured and simulated dent profiles for dents 400-20 and 600-50 on 32CrMoV13 and M50

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Figure 16

Cumulated plastic strain introduced during indentation on nitrided 32CrMoV13 steel

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Figure 17

Von Mises residual stress introduced during indentation on nitrided 32CrMoV13 steel

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Figure 18

Components of the residual stress tensor for dent 200-20 on nitrided 32CrMoV13 steel

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Figure 19

Comparison of dent profiles obtained by FEM simulation for dent 200-20 (32CrMoV13) and by Eqs. 3,4

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Figure 23

Influence of hardening and residual stresses due to indentation on H1Id

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Figure 24

Monotonic evolution of H1Id with the average slope of dents

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Figure 25

IR of dents and their experimental behavior for condition ES8

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Figure 22

Comparison of H1Id for nitrided 32CrMoV13 and M50: (a) Rp=200μm and (b) Rp=400μm



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