Study of Factors Affecting on Formability of Stainless Steel Alloys

Abstract

Factors affecting on formability of austenitic stainless steel AISI321 and twoduplex stainless steels GOST A917, and SAF2205, have been studied in the asreceivedcondition at different strain rates, testing temperatures, and directions.The mechanical properties obtained from tensile testing (strength, ductility, strainhardening index, and strain rate sensitivity), have been chosen as criteria to detectthe formability. The values of these criteria are compared with stretching behaviorobtained from Olsen test (peak height, maximum stretching force, and total workdone). Strain hardening index, elongation, and tensile: yield ratio, were foundgood criteria which represent formability. Results from tensile and stretching testsof these alloys in the as-received condition, showed that the austenitic stainlesssteel had the best formability due to its higher ductility and work hardenability.Formability was found to be dependent on strain rate, testing temperature, androlling direction due to the anisotropy. Stretching tests for the three alloys in theas-received condition, showed that 321 austenitic stainless steel had higher (hvalue), followed by 2205 duplex. Lubrication was found to improve formabilityby increasing the (h-value) for the three alloys.

Keywords

• austenitic and duplex stainless steels
• formability
• tensile and stretching tests