Mo含量对激光熔覆铁基涂层高温摩擦磨损性能的影响OA

To extend the service life of semi-steel rolls,the effects of different Mo contents on the high-temperature friction and wear properties of laser-clad iron-based coatings were analyzed.The surface of worn-out semi-steel rolls was repaired via laser cladding,and the cladding layer used Fe-Cr-Ni-Mo alloy powders.The microstructures of the cladding layers were analyzed using instruments such as an optical mi-croscope(OM),X-ray diffractometer(XRD),scanning electron microscope(SEM),and HBRV-187.5 Brinell-Rockwell-Vickers hardness tester.High-temperature friction and wear tests were conducted on the repaired rolls using a high-temperature friction and wear tester,and the effects of different Mo contents on the high-temperature friction and wear properties of the remanufactured samples were analyzed.The results indicate that the cladding layer primarily consists of ferrite,martensite,and a small amount of retained aus-tenite and contains a small amount of M7C3-type and Mo2C carbides,Fe-Cr,and(FeNi)solid solutions,as well as metallic solid solutions formed by Fe and Mo;with the increase of Mo element content,the micro-structure distribution of the cladding layer becomes more uniform;the hardness of the cladding layer first increases and then decreases,and the friction coefficient of the cladding layer first decreases and then in-creases;when the mass fraction of Mo is 4%,the hardness value of the cladding layer is the highest(55.3 HRC),which is increased by 28.6%compared with that of the substrate;the friction coefficient is the low-est(0.29),which is decreased by 10.1%compared with that of the substrate;the friction and wear type transforms from the adhesive wear and delamination wear of the substrate into abrasive wear.In summary,the repaired remanufactured samples effectively extend the service life of semi-steel rolls.