Exceptionally high strength and good ductility in an ultrafine-grained 316L steel processed by severe plastic deformation and subsequent annealing

Authors: El-Tahawy, M., Pereira, P.H.R., Huang, Y., Park, H., Choe, H., Langdon, T.G. and Gubicza, J.

Journal: Materials Letters

Volume: 214

Pages: 240-242

eISSN: 1873-4979

ISSN: 0167-577X

DOI: 10.1016/j.matlet.2017.12.040

Abstract:

An investigation was conducted to evaluate the effect of annealing at different temperatures on the tensile properties of ultrafine-grained 316L stainless steel processed by high-pressure torsion (HPT). A “moderate-temperature” annealing at 740 K resulted in reduced strength and elongation due to the annihilation of mobile dislocations. A “high-temperature” annealing at 1000 K yielded a remarkably good combination of yield strength (∼1330 MPa) and elongation to failure (∼43%) which can be attributed to the almost full reversion of α′-martensite formed during HPT into γ-austenite while the grain size remained very fine with a value of about 200 nm.

Source: Scopus