Influence of Deformation Temperature and Time on the Mechanical Properties of Pulsation Deformed Stainless Steel

摘要

Pulsation forging of metallic materials (also referred to as stresscycling) is a novel forming method based on the application of a variable pulsation frequency during the metal forming process. This paper presents some new results obtained after pulsation forming of steel grade Cr_(18)Ni_(10). The previous works given by the present authors suggested that the value of summary deformation of 25 percent (at the pulsation frequency of 30 Hz) was obtained with the very good compromise of yield strength (Rp 0,2), tensile strength (Rm), elongation (A5) and contraction (Z). Value of geometrical parameter THETA of 20 percent or the highest value of is found to improve the flow of material at pulsation forming process in a sense of the lower plastic deformation heterogeneity. The experimental results were given with respect to the effect of deformation temperature (from 1193 to 1123 K) and deformation time (from 2 to 10 sec.) at constant heating temperature (1373 K) and constant pulsation frequency (30 Hz) on mechanical characteristic (R_(p0,2); Rm_; A_5; Z) of stainless steel grade Cr_(18)Ni_(10). The relationships between strength - plastic values and geometrical parameters THETA were also investigated.