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Research Papers: Friction & Wear

The Effect of Cementite Size and Morphology on the Abrasive Wear Behavior of UHC Steel

[+] Author and Article Information
Niyazi Ozdemir, Nuri Orhan

Department of Metallurgy, Faculty of Technical Education, University of Fırat, 23119 Elazığ, Turkey

Furkan Sarsilmaz

Department of Metallurgy, Faculty of Technical Education, University of Fırat, 23119 Elazığ, Turkeyfsarsilmaz@firat.edu.tr

J. Tribol 130(2), 021602 (Mar 13, 2008) (5 pages) doi:10.1115/1.2842238 History: Received September 08, 2006; Revised December 12, 2007; Published March 13, 2008

In this study, the abrasive wear behavior of a grain refined hypereutectoid carbon steel containing 1.2% C, 4% Al, 0.20% Mo, and 0.1% Ti was investigated experimentally. Thermal cycles were applied to all specimens about ten times to obtain a fine-grained structure and to gain more softness structures, such as spheroidized cementite for these steels. After every thermal cycle, the microstructures of specimens were examined by scanning electron microscopy to determine the transformation mechanism of structure. Microstructure analyses showed that size of cementite decreased as a function of heat treatment cycle. With the increase of heat treatment cycle, the grain size of cementite in all specimens started to decrease. As a consequence, these cementite islands transformed to spherical cementite having an average grain size of 5μm. In addition, the wear test results indicated a correspondence between wear rate and thermal cycling. However, the hardness values decreased with increasing heat treatment cycle.

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Copyright © 2008 by American Society of Mechanical Engineers
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Figure 1

Illustrations of pin-on-disk abrasive wear apparatus

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Figure 2

The microstructure of specimen prior to thermal cycle

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Figure 3

SEM micrographs of microstructure after thermal cycle: (a) second, (b) fourth, (c) sixth, (d) eight, and (e) tenth

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Figure 4

Hardness result of all samples as a function of heat treatment cycle

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Figure 5

Abrasive wear behaviors of specimens under applied load of 10–20N as a function of heat treatment cycle

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Figure 6

SEM micrograph of wear scar of all specimens: (a) After casting processes, (b) second thermal cycle, (c) fourth thermal cycle, (d) sixth thermal cycle, (e) eighth thermal cycle, and (f) tenth thermal cycle

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