Study of factors affecting on formability of stainless steel alloys

الملخص EN

Factors affecting on formability of austenitic stainless steel AISI321 and two duplex stainless steels GOST A917, and SAF2205, have been studied in the as received condition at different strain rates, testing temperatures, and directions.

The mechanical properties obtained from tensile testing (strength, ductility, strain hardening index, and strain rate sensitivity) , have been chosen as criteria to detect the formability.

The values of these criteria are compared with stretching behavior obtained from Olsen test (peak height, maximum stretching force, and total work done).

Strain hardening index, elongation, and tensile : yield ratio, were found good criteria which represent formability.

Results from tensile and stretching tests of these alloys in the as-received condition, showed that the austenitic stainless steel had the best formability due to its higher ductility and work harden ability.

Formability was found to be dependent on strain rate, testing temperature, and rolling direction due to the anisotropy.

Stretching tests for the three alloys in the as-received condition, showed that 321 austenitic stainless steel had higher (h-value) , followed by 2205 duplex.

Lubrication was found to improve formability by increasing the (h-value) for the three alloys.