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ISSN (Print): 2212-7976
ISSN (Online): 1874-477X

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Research Article

Experimental Research on the Performance of High-Temperature Bearing Steel Cr4Mo4 V

Author(s): Zenan Chu and Qiang He*

Volume 15, Issue 2, 2022

Published on: 25 May, 2021

Page: [195 - 205] Pages: 11

DOI: 10.2174/2212797614666210525115618

Price: $65

Abstract

Background: Cr4Mo4 V steel is widely used in high-temperature bearings because of its excellent high-temperature performance. Based on the research status of Cr4Mo4 V nationally and internationally, this paper explores its mechanical properties and friction properties at high temperatures.

Objective: To characterize the composition, microstructure, and properties of Cr4Mo4 V steel and explore its tensile properties, hardness, and friction properties at high temperatures.

Methods: Many methods are adopted, including chemical element analysis, metallographic analysis, hardness test, tensile test, damping test, and friction test.

Results: Cr4Mo4 V has a tempered martensite microstructure. The hardness and maximum tensile strength of Cr4Mo4 V decrease with increasing temperature. The grain of the Cr4Mo4 V steel after heating becomes refined, and the grain boundary increases. At room temperature, the surface friction coefficient and wear rate of Cr4Mo4 V steel decrease. Moreover, a Cr4Mo4 V steel-ceramic ball shows the best friction resistance. At high temperatures, the friction coefficient and wear of Cr4Mo4 V steel first decrease with increasing temperature and then increase sharply at 200°C.

Conclusion: With an increase in temperature, the hardness, breaking force, and tensile strength of Cr4Mo4 V bearing steel decrease, whereas the friction property increases. By analyzing the threedimensional morphology of different wear samples, the optimal working temperature of Cr4Mo4 V steel bearing is determined as 200°C.

Keywords: Cr4Mo4 V steel, high temperature, chemical composition, tensile stress, friction, damping test.

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