Powder Iron-Copper Materials obtained by Liquid Infiltration: Computer Modelling and Experiment

摘要

Carried out is an analysis of modern methods of production and strengthening powder iron-copper composites, studied are processes of producing materials of segregation and percolation types. Developed are methods of improving a structure and physical-mechanical properties of iron-copper composites operating in conditions of increased mechanical loadings, friction and wear, and a process of infiltration with copper melt of an iron frame and hot deforming the infiltrated billets. Found is that using infiltration enables to obtain the following properties of powder composite material containing Fe as basic component, (0.5-1.5)% C, (2-4)% Ni, (15-20)% Cu: tensile strength - 620MPa, hardness - 1400MPa, elongation - 2.5%. The additional using of hot deformation of this material enables to increase properties to the values: tensile strength 840-970MPa, hardness - 2400-3300MPa according to the green density of the powder billet. On the basis of a plasticity theory there is developed a model of deformation of a porous compressible body, taking into account a percolation and segregation type of distributing iron and copper phase in the composite. Comparing the results of theoretical calculation of densification processes with experimental data showed satisfactory concurrence - in limits 10-15%.