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针对大功率密度柴油机缸套高温磨损失效问题,利用低温离子渗硫技术在42MnCr52钢激光淬火表面制备了渗硫层,采用扫描电子显微镜(SEM)、X射线衍射(XRD)、纳米硬度仪、划痕仪和台架试验装置分析了复合层的形貌组成、组织结构、力学性能与高温磨损性能。结果表明,复合层表面疏松多孔,其相组成主要为FeS,厚度约为5μm,与基底结合紧密。在发动机台架试验条件下,激光渗硫复合处理能降低缸套的磨损量,同时减轻了对磨活塞环的磨损,其主要原因是复合层表面的固体润滑硫化物有效抑制了高温粘着磨损和磨粒磨损,改善了缸套/活塞环摩擦副表面的匹配性能,使缸套的抗高温磨损性能得到提高。
In order to deal with the high temperature wear failure problem of high density diesel engine cylinder liner, the sulfurized layer was prepared on the laser quenched surface of 42MnCr52 steel by low temperature ionized sulfur infiltration technique. The microstructure of the coating was characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD) The tester, the bench tester and the bench test device were used to analyze the morphology, microstructure, mechanical properties and wear resistance of the composite layer. The results show that the surface of the composite layer is porous and porous, and its phase composition is mainly FeS with a thickness of about 5μm, which is close to the substrate. Under the engine bench test conditions, the laser infiltration sulfur composite treatment can reduce the wear amount of the cylinder liner, and reduce the wear on the piston ring, the main reason is that the solid lubricating sulfide on the composite layer effectively inhibits the high temperature adhesion wear and Abrasive wear, improve the cylinder / piston ring friction surface matching performance, so that the cylinder liner high temperature wear resistance is improved.