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RESEARCH PAPERS

Effect of Laser Surface Modifications Tribological Performance of 1080 Carbon Steel

[+] Author and Article Information
S. H. Aldajah

 UAE University, Al-Ain, UAE

O. O. Ajayi, G. R. Fenske, Z. Xu

Energy Technology Division,  Argonne National Laboratory, Argonne, IL 60439

J. Tribol 127(3), 596-604 (Jan 18, 2005) (9 pages) doi:10.1115/1.1924461 History: Received April 01, 2004; Revised January 18, 2005

High-power laser surface treatments in the form of glazing, shock peening, cladding, and alloying can significantly affect material surface properties. In this paper, effects of laser glazing, laser shock peening, and their combination on the tribological behavior of 1080 carbon steel were investigated. Laser glazing is a process in which a high-power laser beam melts the top layer of the surface, followed by rapid cooling and resolidification. This results in a new surface layer microstructure and properties. Laser shock peening, on the other hand, is a mechanical process in which a laser generates pressure pulses on the surface of the metal, similar to shot peening. Five conditions were evaluated: untreated (baseline), laser shock peened only (PO), laser glazed only, laser glazed then shock peened last, and laser shock peened then glazed last (PFGL). In pin-on-disc testing, all laser-treated surfaces reduced dry friction when sliding against alumina, with the PFGL surface having maximum friction reduction of 43%, especially in the early stage of testing. Under lubricated conditions, all laser-treated surfaces except the PO sample lowered friction against alumina. Similarly, all glazed samples showed reduced wear by a factor of 2–3, whereas the peening alone did not change wear significantly. These tribological results are associated with changes in the near-surface microstructure and properties.

Copyright © 2005 by American Society of Mechanical Engineers
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Figures

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Figure 1

Pin-on-disc test machine

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Figure 2

1080 carbon steel with four different treatments

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Figure 3

(a) Single-pass laser-glazed region and (b) multipass laser-glazed region

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Figure 4

Optical micrographs with Knoop microhardness measurements

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Figure 5

Variation of microhardness with depth

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Figure 6

(a) Friction coefficient versus time for dry contact and (b) friction coefficient versus time for lubricated contact

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Figure 7

Ball wear volume

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Figure 8

Two- and three-body abrasions in alumina ball wear scar

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Figure 9

Grain boundary microcracking and grain cleavage in alumina

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Figure 10

Debris accumulation after grain pullout on alumina ball

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Figure 11

Flat wear volume under dry and lubricated conditions

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Figure 12

Different degrees of abrasion in flats

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Figure 13

Crack initiation resulting in material loss

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Figure 14

Areas of local indentations in the wear track

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Figure 15

Mild abrasion (polishing) wear under lubricated condition

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Figure 16

Plastic deformation at the edge of a polishing mark

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