Aiming at the problems of low surface bearing capacity and poor wear resistance of 38CrMoAl/QT500 in axial piston pump,a salt bath nitriding treatment process was designed.The modified layer of salt bath nitriding was obtained on the surface of different types of ductile iron.According to the actual application conditions,the friction and wear test was carried out by CFT-I reciprocating friction and wear instrument,and the tribological behavior of QT450,QT500,QT550 and matrix QT500 after nitriding and grinding with 38CrMoAl ball under liquid lubrication was analyzed by microhardness tester,SEM and EDS.Combined with friction factor,wear amount,wear morphology and wear surface chemical composition.During the friction process,the wear resistance of nodular cast iron after salt bath nitriding treatment is significantly improved,which plays a role in reducing wear and providing continuous lubrication.The wear mechanism is mainly slight oxidation wear and fatigue wear.
维普
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