Fatigue properties of powder metallurgy parts are affected mainly by the porosity fraction. Even though it has inferior mechanical and physical properties over the conventional materials, the application of powder metallurgy products in automotive fields is seen in recent trends. The rolling-sliding contact fatigue behavior of sintered and hardened steels has been investigated by performing experiments that represent practical sliding friction coefficient component prevailing in the medium- and heavy-duty bearings and gears. Introduction of sliding friction coefficient changes the typical failure pattern and wear rate of sintered and hardened steels. The sliding friction has been computed from available models and compared with the experimental data. The ratcheting strain has also been predicted for sintered and hardened steels for various contact pressures and sliding friction coefficients. The maximum value of this strain is responsible for surface crack initiation. The wear particle analysis is carried out for the sintered and hardened steels under rolling-sliding contact fatigue conditions. The ferrogram slides for pore free steel under the rolling-sliding contact fatigue conditions are also prepared to study the effect of porosity in wear mechanism. The characteristics of wear morphology and the size, shape, and concentration of worn particles for sintered and hardened steels are also analyzed for various rolling-sliding contact fatigue conditions.

1.
Hoffmann
,
G.
,
Sonsino
,
C. M.
, and
Michaelis
,
K.
, 1999, “
Rolling Contact Fatigue-Component Design and Testing for P/M Applications
,”
International Congress & Exposition
, SAE, Detroit, MI, 1999-01–0332.
2.
Fleck
,
N. A.
, and
Smith
,
R. A.
, 1981, “
Effect of Density on Tensile Strength, Fracture Toughness, and Fatigue Crack Propagation Behaviour of Sintered Steels
,”
Powder Metall.
0032-5899,
3
, pp.
121
125
.
3.
Bocchini
,
G.
, 1986, “
Influence of Porosity in Powder Metallurgical Properties
,”
Int. J. Powder Metall.
0020-7535,
22
, pp.
185
202
.
4.
Sonsino
,
C. M.
, 1990, “
Fatigue Design of Powder Metallurgy
,”
Metal Powder Report
,
45
(
11
), pp.
754
764
.
5.
Rajiv
,
N.
, 2001, “
Rolling Contact Fatigue Behavior of Sintered and Hardened Steel
,” MS thesis, I.I.T. Madras, Chennai, India.
6.
Govindarajan
,
N.
, 2002, “
Rolling Sliding Contact Fatigue Behaviour of Sintered and Hardened Steels
,” MS thesis, I.I.T. Madras, Chennai, India.
7.
Jones
,
W. R.
, and
Parker
,
J.
, 1977, “
Ferrographic Analysis of Wear Debris Generated in Accelerated Rolling Element Fatigue Tests
,”
ASLE Trans.
0569-8197,
22
, pp.
37
45
.
8.
Govindarajan
,
N.
, and
Gnanamoorthy
,
R.
, 2007, “
Study of Damage Mechanisms and Failure Analysis of Sintered and Hardened Steels Under Rolling-Sliding Contact Conditions
,”
Mater. Sci. Eng., A
0921-5093,
445–446
, pp.
259
268
.
9.
Harris
,
T. A.
, 2001,
Rolling Bearing Analysis
,
4th ed.
,
Wiley
,
New York
.
10.
Seireg
,
A. A.
, 1999,
Friction and Lubrication in Mechanical Design
,
Dekker
,
New York
.
11.
Blau
,
P. J.
, 1998, “
Rolling Contact Wear
,”
ASM Hand Book
,
8
, pp.
257
262
.
12.
Li
,
Y.
, 1989, “
Prediction of Friction in Rolling/Sliding Contact Fatigue
,”
ASME J. Tribol.
0742-4787,
111
, pp.
386
390
.
13.
Stachowiak
,
G. W.
, and
Batchelor
,
A. W.
, 2000,
Engineering Tribology
,
2nd ed.
,
Butterworth Heinemann
.
14.
Sonsino
,
C. M.
, 1990, “
Planery Overview Fatigue Design for P/M
,”
Powder Metall.
0032-5899,
33
, pp.
235
245
.
15.
Govindarajan
,
N.
, and
Gnanamoorthy
,
R.
, 2007, “
Rolling/Sliding Contact Fatigue Life Prediction of Sintered and Hardened Steels
,”
Wear
0043-1648,
262
, pp.
70
78
.
16.
Straffilini
,
G.
,
Marcu Puscas
,
T. M.
, and
Molinari
,
A.
, 2000, “
Identification of Rolling-Sliding Damage Mechanisms in Porous Alloys
,”
Metall. Mater. Trans. A
1073-5623,
31A
, pp.
3091
3099
.
17.
Dang-Van
,
K.
, and
Maitournam
,
M. H.
, 2002, “
On Some Recent Trends in Modeling of Contact Fatigue and Wear in Rail
,”
Wear
0043-1648,
253
, pp.
219
227
.
18.
Ciavarella
,
M.
,
Monno
,
F.
, and
Demelio
,
G.
, 2006, “
On the Dang Van Fatigue Limit in Rolling Contact Fatigue
,”
Int. J. Fatigue
0142-1123,
28
, pp.
852
863
.
19.
Su
,
X.
, and
Clayton
,
P.
, 1997, “
Ratcheting Strain Experiments With a Pearlitic Steel Under Rolling/Sliding Contact
,”
Wear
0043-1648,
205
, pp.
137
143
.
20.
Ringsberg
,
J. W.
,
Loo-Morrey
,
M.
,
Josefson
,
B. L.
,
Kapoor
,
A.
, and
Beynon
,
J. H.
, 2000, “
Prediction of Fatigue Crack Initiation for Rolling Contact Fatigue
,”
Int. J. Fatigue
0142-1123,
22
, pp.
205
215
.
21.
Kapoor
,
A.
, 1997, “
Wear by Plastic Ratcheting
,”
Wear
0043-1648,
212
, pp.
119
130
.
22.
Kubicki
,
B.
, 1995, “
Stress Concentration at Pores in Sintered Materials
,”
Powder Metall.
0032-5899,
38
, pp.
295
298
.
23.
Liu
,
Y.
, 1997, “
Advances in Research on a Multi Channel On-Line Ferrograph
,”
Tribol. Int.
0301-679X,
30
, pp.
279
282
.
24.
Roylance
,
B. J.
, 2005, “
Ferrography-Then and Now
,”
Tribol. Int.
0301-679X,
38
, pp.
857
862
.
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