Study On Microstructure And Properties Of WCp/FeComposites Prepared By V-EPC

Particle reinforced iron matrix composite has been used in metallurgy equipment,cement industry,mining machinery and other fields due to its wear-resistant,high temperature resistant,good impact resistance and low cost.However,the current batch production process of particle reinforced iron matrix composite is complex and high cost,which directly affects the promotion of particle reinforced iron matrix composite.Therefore,it has good economic and social benefits to develop a new particle reinforced iron-based composite material preparation process with high production efficiency and low cost.In this paper,the WC particle reinforced high chromium cast iron was studied.WCp/Fe composite was prepared by V-EPC(Lost Foam Casting),and the uniformity,wear resistance and phase composition of WCp/Fe composite were analyzed.The WC particles with the particle size of 600?2500 mesh were mixed with the binder and the EPS beads respectively according to certain requirements,and the test block and the lost foam model of the rear guard board of a slurry pump containing the WC particles were prepared by the steam pre-expansion machine.The test block and the casting of the rear guard board of a slurry pump of WCp/Fe composite materials were prepared by brush coating and pouring.The distribution of WC in WCp/Fe composite was studied by means of metallographic microscope,SEM and EDS.WC particles with the particle size of 600?2500 mesh were mostly dissolved in high-temperature molten iron and chemical reactions took place.Most of the reaction products were separated in the form of Fe3W3C compound carbide at the grain boundary,and the remaining few W and C were in the form of multi-component solid solution in the matrix.The overall distribution of Fe3W3C phase was relatively uniform,with a little local aggregation and good interface bonding.A large amount of Fe3W3C phase was generated in the segregation of WC particles,which made the interface reaction layer form more microscopic shrinkage holes,which had a significant influence on the interface bonding condition.The influence of top gating,bottom gating and slot gating systems on the distribution of W element content in WCp/Fe composite test block were studied.The influence of WC particle size on the distribution of W element content in WCp/Fe composite was analyzed under the same pouring mode,and the uniformity of W element content distribution was determined by using the standard deviation of W element contentThe effect of particle size on the hardness and wear resistance of WCp/Fe composite block was studied under different pouring methods of top gating,bottom gating and slot gating systems.Taking the rear guard board of a slurry pump casting produced by a factory as an example,the rear guard board of a slurry pump of WCp/Fe casting was prepared on the production site by using the existing equipment of the factory.The effect of particle size on the wear resistance and hardness of the test block cut from the rear guard board casting was studied.