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| Effect of Heating-Cooling Cycles of Different Temperatures on Friction and Wear Properties of Gun Steel |
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| DOI：10.7643/issn.1672-9242.2022.07.008 |
| KeyWord:extrusion process of artillery gun steel heating-cooling cycles friction wear high temperature oxidation |
| Author | Institution |
| XU Zhang |
School of Mechanical Engineering, Nanjing University of Science and Technology, Nanjing , China |
| CAO Shou-fan |
School of Mechanical Engineering, Nanjing University of Science and Technology, Nanjing , China |
| YANG Guo-lai |
School of Mechanical Engineering, Nanjing University of Science and Technology, Nanjing , China |
| LIANG Yi |
School of Mechanical Engineering, Nanjing University of Science and Technology, Nanjing , China |
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| Abstract: |
| The objective of this paper is to study the effect of heating-cooling cycles of different temperatures on the friction and wear properties of gun steel and its wear mechanism. Heating-cooling cycles were performed on the PCrNi3MoVA gun steel at 400 ℃ and 800 ℃, respectively. A universal tribometer was used to test the friction and wear properties of the gun steel pin paired with H96 brass plate at different sliding speeds. The friction coefficient was recorded and the wear of the gun steel pin and brass plate was quantified. The worn surface morphology and chemical composition of the gun steel pin was observed and analyzed using scanning electron microscope and energy dispersive spectrometer, and the wear mechanism was analyzed. The results showed the heating-cooling cycles had little effect on the friction coefficient of the gun steel pin at the sliding speed of 100 r/min. With the increase of heating temperature in the heating-cooling cycles, the wear loss of the gun steel pin increased, while the wear loss of the brass disk was little affected by the heating-cooling cycles of the gun steel pin. The worn surface of the gun steel pin after heating-cooling cycles showed obvious pits and grooves caused by material plastic deformation induced spalling. When the sliding speed increased, the friction coefficient of the gun steel pin decreased, and the wear loss reached the maximum at 400 r/min, but decreased to almost 0 at 800 r/min. The worn surface analysis showed that, at 800 r/min, the friction and wear properties of the gun steel pin were affected by the mixing of brass and gun steel wear debris. It is concluded that the heating-cooling cycles have little effect on the friction coefficient of the gun steel-brass friction pair, but with the increase of heating temperature in the heating-cooling cycles, the wear resistance of the gun steel pin decreases. The sliding speed has great influence on friction coefficient and wear loss of the gun steel pin. At high sliding speed, the mixing of brass and gun steel wear debris exists and attaches to the worn surface of the gun steel pin, which can change the wear mechanism of the gun steel pin. |
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