Evaluation of Matrix and Geometric Strain Hardening of Axial Deformed Sintered Fe-0.75%C Preform

Abstract

Strain hardening occurs as a result of extensive plastic deformation of a material at below recrystallization temperature. The powder metallurgy route subjects the elemental powders to highly plastic deformation under compaction; however it is softened while it is sintered. In order to enhance its mechanical behaviour, it is usually subjected to secondary deformation operation. In the present investigation the cold upsetting exercise is carried out in three different lubricants condition with two different preform geometries on sintered Fe-0.75%C. Unlike the conventional material under plastic deformation the matrix gets strain harden, in P/M material along with matrix the geometry supplements the strain hardening behaviour. The nature of matrix and geometric hardening behaviour has been dealt. In addition an empirical relationship and its corresponding parameters experimental values have been predicted which is of high importance in design of preforms and die-set for actual production.