Abstract
An investigation on the tribological properties of GCr15 sliding against NM600 was carried out using a high-temperature friction and wear tester. As the temperature rose from room temperature to 300 °C, the average friction coefficient of NM600 increased rapidly, then decreased rapidly, and then became stable. The wear volume and specific wear rate of NM600 increased rapidly, then decreased rapidly, and then increased slowly. The wear mechanism and matrix properties of the tested steel at different temperatures are the main reasons for the above results. At 20–50 °C, the main wear mechanism was adhesive wear, fatigue wear, and abrasive wear. At 100–150 ℃, the wear mechanism was mainly adhesive wear, fatigue wear, abrasive wear, and oxidation wear. At 200–300 °C, the wear mechanism was mainly oxidation wear and abrasive wear.
Highlights
Low-alloy high-strength wear-resistant steel is widely used in coal mining, construction, metallurgy, and other engineering fields with complex service conditions because of its high hardness and toughness [1,2,3]
The research on the wear process of low-alloy and high-strength wear-resistant steel is mainly focused on the wear at room temperature, though usually the wear of equipment occurs at a certain temperature [4,5,6]; for example, when the middle groove of the fully-mechanized mining scraper conveyor carries out coal mine material transportation
It can be seen that when the experimental temperature exceeded 200 °C, the average friction coefficient of the tested steel was less sensitive to temperature, indicating that the wear mechanism of the tested steel may have (a)
Summary
Low-alloy high-strength wear-resistant steel is widely used in coal mining, construction, metallurgy, and other engineering fields with complex service conditions because of its high hardness and toughness [1,2,3]. The research on the wear process of low-alloy and high-strength wear-resistant steel is mainly focused on the wear at room temperature, though usually the wear of equipment occurs at a certain temperature [4,5,6]; for example, when the middle groove of the fully-mechanized mining scraper conveyor carries out coal mine material transportation. Taking NM600 low-alloy high-strength wear-resistant steel as the research object, through the sliding friction and wear experiments under different temperature conditions, analysis of the influence of temperature on NM600 wear-resistant steel wear behavior rule was completed. The wear mechanisms are discussed in this paper in order to improve the service life of the middle trough of the fully-mechanized mining scraper conveyor and provide certain data to support
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