Arabacı Uğur
Faculty of Technology, Department of Metallurgical and Materials Engineering, Gazi University, Ankara, Turkey.
Heliyon. 2024 Feb 5;10(3):e25589. doi: 10.1016/j.heliyon.2024.e25589. eCollection 2024 Feb 15.
This study, it was aimed to examine the dry sliding wear properties of the tempering and over-tempering heat treatments of 25CrMo4 steel, which is used in the manufacture of parts such as axle shafts, axle sleeves, turbine parts, and turbine blades in the automotive industry Oil-quenched 25CrMo4 steels could be subjected to high temperatures where they are used and may undergo over-tempering period. In this case, there may be changes in many mechanical properties such as wear. For this purpose, microstructural examination, hardness, and dry sliding wear tests were performed on the materials. As a result of the tests, it was observed that the sample, on which we applied the tempering and over-tempering heat treatment, had a martensitic microstructure. The hardness values of the tempered and over-tempered samples increased compared to the raw material and as expected, partially decreased in the over-tempered sample. Dry sliding wear losses decreased significantly in oil-quenched and over-tempered samples compared to the raw material. Even though the hardness decreased in the over-tempered sample, the wear loss was low. The variation between wear losses increased further with the increase in friction forces. While the maximum friction coefficient was highest in the oil-quenched sample, it was lowest in the raw sample.
本研究旨在考察25CrMo4钢调质和过调质热处理后的干滑动磨损性能。25CrMo4钢用于制造汽车工业中的半轴、轴套、涡轮部件和涡轮叶片等零件。油淬25CrMo4钢在使用过程中可能会承受高温，并且可能会经历过调质阶段。在这种情况下，磨损等许多力学性能可能会发生变化。为此，对材料进行了微观结构检查、硬度测试和干滑动磨损试验。试验结果表明，经过调质和过调质热处理的样品具有马氏体微观结构。调质和过调质样品的硬度值相对于原材料有所增加，并且正如预期的那样，过调质样品的硬度值部分下降。与原材料相比，油淬和过调质样品的干滑动磨损损失显著降低。尽管过调质样品的硬度有所下降，但其磨损损失较低。随着摩擦力的增加，磨损损失之间的差异进一步增大。油淬样品的最大摩擦系数最高，而原始样品的最大摩擦系数最低。
