Abstract
18Ni(300) maraging steel, which has exceptional strength and toughness, is used in the field of aviation and aerospace. In this paper, using a high-speed tribo-tester, tribological behaviors of 18Ni(300) maraging steel were investigated under high-speed dry sliding conditions. Morphology of the worn surfaces and the debris was analyzed by scanning electron microscope, and the oxides of worn surfaces caused by friction heat were detected by X-ray diffraction. The experiment results reveal that the friction coefficient of frictional pairs declines with increasing load and speed. With the speed and load increasing, oxides of the worn surfaces of 18Ni(300) maraging steel change from FeO to Fe3O4 and the wear mechanism converts from adhesive wear into severe oxidative or extrusion wear.
Highlights
18Ni(300) maraging steel is a kind of high-alloy maraging steel, depending on 9% cobalt as its strengthening agent, and has ultra-high strength, high toughness, good machinability, and weldability.It is widely used in pressure vessels, aircraft components, rocket motor cases, hot-work dies, and high-speed rocket-propelled sleds
It can be found that the friction coefficient decreased with the speed and load weighed wear loss with a balance with an accuracy of 0.01 friction coefficient and weighed for for with balance with
When the product is larger than 81 MPa·m/s, the variation of the friction coefficient is very smooth and belongs to region III;. These changes in the variation rate of Discussions the friction coefficient reveal that there may be a transformation of the wear mechanism of 18Ni(300)
Summary
It is widely used in pressure vessels, aircraft components, rocket motor cases, hot-work dies, and high-speed rocket-propelled sleds. Li and Yin [1] examined the effect of age time and temperature on the evolution of reverted austenite in 18Ni(350) maraging steel. Investigated the austenite and martensite phases of 18Ni(300) maraging steel at different temperatures and periods of time and revealed that the martensite parameter increased with the aging time above. Hale et al [6] predicted the wear rate of 18Ni(300) maraging steel during a high-speed dry sliding process using ABAQUS with a surface collision numerical model
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