Fretting Corrosion Tendencies of Several Combinations of Materials

McDowell, John

doi:10.1520/stp46115s

Cited by 22 publications

(12 citation statements)

References 2 publications

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“…from the range of 10 8 ÷ 10 9 cycles or greater). The approach has been applied with success to study the fretting fatigue by adding the lateral loading pads to the classical fatigue rig [9][10][11][12]. This action takes immediate effect on the position of the Wöhler's curve and the influence of fretting fatigue can be expressed by the decrease of the endurance limit (Fig.…”

Section: Introductionmentioning

confidence: 99%

Development of a Wöhler-like approach to quantify the Ti(CxNy) coatings durability under oscillating sliding conditions

Liskiewicz

Fouvry

Wendler

2005

Wear

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The selection of a proper material for the particular engineering application is a complex problem, as different materials offer unique properties and it is not possible to gather all useful characteristics in a single one. Hence, employment of different surface treatment processes is a widely used alternative solution. In many industrial applications, coating failure may be conducive to catastrophic consequences. Thus, to prevent the component damage it is essential to establish the coating endurance and indicate the safe running time of coated system. To this study PVD TiC, TiN and TiCN hard coatings have been selected and tested against polycrystalline alumina smooth ball. The series of fretting tests with reciprocating sliding at the frequency 5Hz have been carried out under 50-150N normal loads and under wide rage of constant as well as variable displacement amplitudes from 50µm to 200µm at a constant value of relative humidity of 50% at 296K temperature. To quantify the loss of material a dissipated energy approach has been applied where the wear depth evolution is referred to the cumulative density of friction work dissipated during the test. Different dominant damage mechanisms have been indicated for the investigated hard coatings, which is debris formation and ejection in case of TiC coating and progressive wear accelerated by cracking phenomena in case of TiN and TiCN coatings. Energy-Wöhler wear chart has been introduced, in which the critical 1 dissipated energy density corresponds to the moment when the substrate is reached after a given number of fretting cycles. Two different methods to determine the critical dissipated energy density are introduced and compared. The Energy-Wöhler approach has been employed not only to compare the global endurance of the investigated systems but also to compare the intrinsic wear properties of the coatings. It has been shown that the fretting wear process is accelerated by the stress-controlled spalling phenomenon below a critical residual thickness and a severe decohesion mechanism is activated. Finally the applicability of the investigated method to other coated systems subjected to wear under sliding conditions is discussed and analyzed. The perspectives of this new approach are elucidated.

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Section: Introductionmentioning

confidence: 99%

Development of a Wöhler-like approach to quantify the Ti(CxNy) coatings durability under oscillating sliding conditions

Liskiewicz

Fouvry

Wendler

2005

Wear

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“…The apparatus used was constructed to test a variety of materials under a wider range of variability of the parameters which effect fretting than did the apparatus originally used by the author (11). Fig.…”

Section: Apparatus and Proceduresmentioning

confidence: 99%

Fretting of Hardened Steel in Oil

McDowell

1958

A S L E Transactions

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To determine the effect of hardness onfretting wear, tests of AfSf 4340 steel were made in an oil bath using a new machine designed to make fretting corrosion tests with a wide range of parameters. Hardness values from 258 to 743 Vickers were tested, the hardest specimen having a nitrided surface. The fretting action used, 0.005 in. reciprocating motion at pressuresfrom 430 psi to 5840 psi, produced much lessfretting than similar tests in air, with little or no.oxide products resulting. The galled areas were measuredfor depth of pit and height of deposit with the results indicating some small effects due to hardness up to 460 Vickers. The nitrided specimens, however, produced smaller fretted areas and the roughening of their surfaces was shallow.

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“…In order to determine under which conditions fretting corrosion will occur, tests were first made in the research laboratory with various combinations of materials and lubricants. These tests showed that for a slip of 50 to 300 microinches and pressures from 300 to 1200 psi, fretting corrosion always occurred between all combinations of metal surfaces and at best was only retarded by use of special lubricants (12).…”

Section: Fretting Corrosion Wearmentioning

confidence: 99%

Some Mechanical Considerations in the Design of Large Thrust Bearings

Baudry

Peterson

1958

A S L E Transactions

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The modern thrust bearing is a very important part of the waterwheel generator, for it must support the weight of the rotating parts of the turbine and generator and the hydraulic thrust load. With the continuous increase in size of hydroelectric generating units, machines now are built with thrust loads well above 1000 tons and requiring bearings ten feet in diameter or larger. Continuous trouble-free operationfor periods of twenty years or more are desiredfor the bearings of large hydroelectric units.Except during the starting period, the pivoted pad thrust bearing operates according to the well-known hydrodynamic theory of lubrication which permits the predetermination of its performance with reasonableaccuracy. Alternating slipping between the thrust bearing runner and~he supporting structure can result in excessive wear which destroy the accuracy of the bearing surfaces. Such wear can cause undesirable vibrations or damage to the bearing surface which prevents the formation of an adequate oil film. As a result of laboratory tests and experience in the field, it is now possible to make large thrust bearings with a supporting structure which will permit them to operate continuouslyfor longperiods oftime with practically no wear or loss of adequacy.

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Fretting Corrosion Tendencies of Several Combinations of Materials

Cited by 22 publications

References 2 publications

Development of a Wöhler-like approach to quantify the Ti(CxNy) coatings durability under oscillating sliding conditions

Development of a Wöhler-like approach to quantify the Ti(CxNy) coatings durability under oscillating sliding conditions

Fretting of Hardened Steel in Oil

Some Mechanical Considerations in the Design of Large Thrust Bearings

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