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采用粉末火焰喷焊技术制备了以40Cr为基体,Ni60A镍基自熔性合金粉末为涂层材料的试样,利用疲劳试验机及摩擦磨损试验机研究了经不同重熔时间处理后试样的弯扭疲劳寿命及耐磨损性能,并采用扫描电子显微镜(SEM)、能谱分析(EDS)、显微硬度计及非接触三维表面轮廓仪对涂层的磨损形貌、组织成分、表面硬度进行了分析。结果表明:合理的重熔时间长度为10 min。当重熔时间合理时,热喷焊件弯扭疲劳性能最强、涂层表面硬度最高、耐磨损能力最强。当重熔时间长度不合理时,涂层中Cr元素的偏析、SiO2颗粒物的生成等因素均显著影响了涂层的微观组织结构,降低了涂层件的疲劳寿命及耐磨损能力。
A 40Cr-based, Ni60A nickel-based self-fluxing alloy powder was used as the coating material by the powder flame spray welding technique. The fatigue strength of the sample after the different remelting time was studied by using a fatigue tester and a friction and wear tester Bending and torsional fatigue life and wear resistance. The wear morphology, the composition of the coating, the surface hardness of the coating were characterized by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), microhardness tester and non-contact three-dimensional surface profilometer Analyzed. The results show that the reasonable remelting time is 10 min. When the remelting time is reasonable, the thermal spray-welded parts have the strongest flexural and torsional fatigue properties, the highest surface hardness and the highest wear resistance. When the length of remelting is unreasonable, the segregation of Cr in the coating and the generation of SiO2 particles all significantly affect the microstructure of the coating and reduce the fatigue life and wear resistance of the coating.