THE EFFECT OF COPPER AND DEFORMATION ON SOME MECHANICAL PROPERTIES OF IRON BASED SINTERED MATERIALS
The behaviour of materials to static solicitations and especially to dynamic solicitations is very influenced by the presence of pores in the structure. Their effect on the concentration of stresses is greater the more the pores are situated closer to the surface. It greatly depends on the type of solicitation that material is subjected to. The processing by plastic deformation can have a double effect. On one hand, it can lead to the hardening of the material; on the other hand, it leads to a favourable tension state in rapport with these types of solicitations. Experimental results show that the effect of superficial deformation of sintered materials on the mechanical properties is different according to the type of solicitation and the structure of the material. It has been observed that it has an important positive effect on the hardness, Young modulus and the behaviour to fatigue of sintered materials.
Keywords: plastic deformation, powder metallurgy, material properties
