Analysis of the influence of temperature on the friction and wear properties of PCrMo steel
Wear due to friction is one of the main causes of mechanical equipment failure. In addition to bringing huge economic losses to people, in some special occasions, the consequences caused by wear and tear are very serious. For example, when the artillery barrel is worn out as the number of shots increases, if the wear is not properly evaluated, it will have a serious impact on future launch accuracy. Based on the research background of a gun's bore and shell friction pair, this paper studies and analyzes the dry sliding friction and wear characteristics of the PCrMo steel and H96 paired pair on the MMS-1G pin-disc high-temperature high-speed friction and wear testing machine in order to predict the gun's failure The simulation system provides experimental basis.
The friction and wear test was carried out on the MMS-1G pin-disc high-temperature high-speed friction and wear testing machine. Pin samples are made of gun steel (PCrMo), and disc samples are made of copper discs (H96). Temperature and speed are the most important external factors that affect the friction and wear properties of materials. A series of experimental studies have shown that the friction and wear properties of materials and temperature and speed usually show a complex change relationship. According to the speed of the testing machine and the size of the sample, the experimental speed is determined to be 20, 30, 40, 50, 60, 70 m / s, the temperature is 25 ℃ and 500 ℃, and the contact pressure is 1 and 2 MPa. At low speed and low load before the experiment Pre-grind under conditions, subject to good contact between the pin sample and the disc sample and the force is relatively uniform. Under each working condition, the test is repeated three times, and the friction coefficient and wear rate are averaged from the three tests.
The results show that as the temperature increases, the friction coefficient of the material decreases; compared with normal temperature conditions, the stability of the friction coefficient of the material at high temperature is better. As the temperature increases, the wear rate of the material increases, and the greater the speed, the more severe this increase will be. At lower sliding speeds, the main wear mechanisms of materials are adhesive wear and abrasive wear. With the increase of sliding speed, at normal temperature, it gradually changes to peeling wear; at high temperature, it gradually changes to thermal wear. The high temperature wear characteristics of the dry sliding friction pair of gun steel are very sensitive to speed changes, and there is a sensitive speed range for the wear characteristics.
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