Cailiao Baohu (Mar 2021)
Effect of Tempering Temperature on the Impact - Resistant Wear Performance of 2Cr3Mo2NiVSi Steel Surface
Abstract
In order to improve the impact - resistant wear performance of 2Cr3Mo2NiVSi mold steel surface, 2Cr3Mo2NiVSi mold steel was tempered at different temperatures, and the influence of tempering temperature on the surface impact - resistant wear performance of 2Cr3Mo2NiVSi mold steel was studied. Furthermore, the mechanism of surface wear failure of 2Cr3Mo2NiVSi mold steel under dynamic impact conditions was described. Results showed that with the increase of tempering temperature, the hardness of 2Cr3Mo2NiVSi steel decreased and the toughness increased. The secondary hardening occurred at around 550 ℃, and the surface hardness was the largest. The weight loss of impact wear decreased first and then increased with the increase of tempering temperature, and the combination of strength and toughness of the sample tempered at 550 ℃ reached the best, and the weight loss of wear was the minimum, indicating that the strength - toughness possessed an important influence on the impact wear resistance of mold surface. With the increase of wear time, the wear mechanism of the material surface was firstly slight plastic deformation, then it changed into furrow cutting wear and adhesion wear, and finally it changed into fatigue peeling wear. After the steel was impacted, brittle fatigue cracks appeared on the surface of the tempered sample at 400 ℃, ductile fatigue cracks appeared on the surface of the tempered sample at 550 ℃, and the surface metal of the tempered sample at 650 ℃ extruded along the crack.
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