Effect Of Mo,B,RE Mg Alloy Elements On Wear Resistance Of High Chromium Cast Iron For Centrifugal Casting Roller

Iron and steel materials as mechanical parts will wear out during use,and it is easy to cause equipment inoperability,material waste and personal injury.Therefore,studying the wear behavior of steel materials and improving the service life are the main tasks of materials workers.As the third-generation wear-resistant material,high-chromium cast iron is one of the most widely used materials in the wear-resistant field.In this study,by adding a certain amount of alloying elements to conventional high chromium cast iron,alloying treatment and modification agent modification treatment,by changing the distribution and shape of carbides,to achieve the reduction of carbide cracking of the matrix and refine the grain The purpose is to improve the toughness and wear resistance of high chromium cast iron,thereby extending the service life.In this study,the raw materials for centrifugal composite casting high chromium cast iron came from a roll company in Zibo,Shandong Province.Under laboratory conditions,metal mold casting was used to explore the microstructure and wear resistance of different amounts of molybdenum,boron,and rare earth magnesium added to high chromium cast iron Impact.In this paper,MLD-10 dynamic load abrasive wear test machine,optical microscope,high temperature friction and wear tester,scanning electron microscope,X-ray diffractometer,Rockwell hardness tester and other test and analysis methods are used to analyze different amounts of molybdenum,boron,rare earth magnesium The influence of alloying elements on the as-cast structure,phase composition,hardness,wear resistance of abrasive materials and friction resistance of high-chromium cast iron.The ideal amount of alloying elements to improve the structure and wear resistance of high chromium cast iron is obtained,providing technical support and theoretical guidance for the application in the factory.The study found:?1?The addition of molybdenum improves the hardenability of high-chromium cast iron.The phase detection found the formation of a new phase Mo₂C.The addition of molybdenum improved the carbide distribution and shape of the as-cast structure and achieved the purpose of fine grain refinement.,Improve the hardness of high chromium cast iron.The abrasion resistance changes with the molybdenum content and the type of abrasive,showing a trend of increasing first,then decreasing and then increasing.When the addition amount of molybdenum is 0.6%,the microstructure and wear resistance of high chromium cast iron reach the best.?2?The alloy element boron was added to high chromium cast iron,and phase detection revealed that boron formed carbon with boron and carbon in the structure.The as-cast structure found that the carbides changed from sharp angles to isolated slab-like distribution,the structure was significantly refined,and the hardness was improved.With the increase of boron content,the wear resistance is also significantly improved.The wear morphology is mainly plastic furrows and lip flanges.When the added amount of boron is 0.3%,the wear resistance of high chromium cast iron is the best.?3?Adding rare earth magnesium to high chromium cast iron,the rare earth can purify the molten iron,and magnesium can be deoxidized and desulfurized.The addition of rare earth magnesium changes the growth environment of carbides,refines the structure,changes the carbides from large flakes to uniformly distributed agglomerates,and reduces the degree of cleavage of the matrix.The main forms of wear scars are furrows and curls.The wear mechanisms mainly include surface micro-cutting and multiple plastic deformations.When the addition amount of rare earth magnesium is 0.6%,the comprehensive performance reaches the best.