Technical Brief

Development of Tribological Test Equipment and Measurement of Galling Resistance of Various Grades of Stainless Steel

[+] Author and Article Information
A. P. Harsha

Department of Mechanical Engineering,
Indian Institute of Technology,
Banaras Hindu University,
Varanasi 221005, India
e-mail: harshaap@gmail.com; apharsha.mec@itbhu.ac.in

P. K. Limaye

Fluid Power and Tribology Section,
Refueling Technology Division,
Hall 3, Bhabha Atomic Research Centre,
Mumbai 400085, India

Rajnesh Tyagi, Ankit Gupta

Department of Mechanical Engineering,
Indian Institute of Technology,
Banaras Hindu University,
Varanasi 221005, India

1Corresponding author.

Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received February 17, 2015; final manuscript received August 11, 2015; published online September 23, 2015. Assoc. Editor: Jordan Liu.

J. Tribol 138(2), 024501 (Sep 23, 2015) (6 pages) Paper No: TRIB-15-1057; doi: 10.1115/1.4031398 History: Received February 17, 2015; Revised August 11, 2015

A mechanized galling tester has been developed to evaluate the galling resistance of material pairs at room temperature (RT) as well as at elevated temperature condition. The test rig has a facility for online measurement of frictional torque during the test which is useful in assessing the incipient scoring. Both the test rig and the test method conform to the recent ASTM G196-08 standard. Galling resistance of two different grades of stainless steel SS 304 and 304 L has been evaluated in self-mated condition at RT and elevated temperature (300 °C). The parameter called galling50 has been reported for the materials tested. The galled surface indicated the severe plastic deformation in the direction of sliding and it is dominated by the typical adhesive wear mechanism. The recent ASTM G196-08 test method for measurement of galling resistance of material pairs appears to be superior to an older ASTM G98 because galling behavior was prevailed by the stochastic wear phenomenon.

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Fig. 1

(a) The photograph of the galling test arrangement and (b) sectional view of the test configuration (1—ball bearing; 2—upper specimen; 3—alignment pin; 4—lower specimen; and 5—contact surface)

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Fig. 2

Photograph of galling test apparatus with details of bottom specimen holder and pneumatic bellows for applying a vertical load

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Fig. 3

Top specimen holder with a button to press over load cell for frictional torque measurement

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Fig. 4

Assembled view at high-temperature condition

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Fig. 5

Typical galled and not galled test sample

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Fig. 6

Galling frequency as a function of applied stress at RT. Galling50 is obtained by applying sigmoid fit to the test data.

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Fig. 7

Galling frequency as a function of applied stress at 300 °C. Galling50 is obtained by applying sigmoid fit to the test data.

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Fig. 8

Variation of frictional torque with time during galling test at RT (SS 304 samples at applied stress of 14.7 MPa). The lowest curve indicates galling has not occurred and rest of the curves show galled situations.



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