Creep Behaviour of 316 Austenitic Stainless Steel at Elevated Temperatures

Abstract

Austenitic stainless steels are used for domestic, industrial, transport, and architectural products based primarily on their corrosion resistance but also for their formability, their strength, and their properties at extreme temperatures. We conducted a creep test of two different specimen of same material at 550°C/275 MPa and 650°C/225 MPa. During creep test a specimen 2 tested at 650°C/225 MPa rupture faster when comparing with specimen 1 tested at 550°C/275 MPa. Even though specimen 1possess high stress value when comparing with specimen 2 rupture life is high due to temperature lower than specimen 2. This shows temperature is dependent factor for creep testing of materials. Microstructure of two specimens are after testing show similar microstructure after creep. Residual cells were still observable in limited areas in both specimens. Variations in the high stress specimen are highly dependent on grain orientations. The residual dislocation cell structure observed in the 316 SS creep specimens may be understood by the dependence of dislocation substructure on grain orientation. creep specimens may be understood by the dependence of dislocation substructure on grain orientation dislocation cell structure observed in the 316 SS.