Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1570982 | Materials Characterization | 2014 | 9 Pages |
Abstract
The nanostructure and mechanical properties of ferritic-austenitic duplex stainless steel subjected to hydrostatic extrusion were examined. The refinement of the structure in the initial state and in the two deformation states (ε = 1.4 and ε = 3.8) was observed in an optical microscope (OM) and a transmission electron microscope (TEM). The results indicate that the structure evolved from microcrystalline with a grain size of about 4 μm to nanocrystalline with a grain size of about 150 nm in ferrite and 70 nm in austenite. The material was characterized mechanically by tensile tests performed in the two deformation states. The ultimate strength appeared to increase significantly compared to that in the initial deformation stages, which can be attributed to the grain refinement and plastic deformation. The heterogeneity observed in microregions results from the dual-phase structure of the steel. The results indicate that hydrostatic extrusion is a highly potential technology suitable for improving the properties of duplex steels.
Related Topics
Physical Sciences and Engineering
Materials Science
Materials Science (General)
Authors
P. Maj, B. Adamczyk-CieÅlak, J. Mizera, W. Pachla, K.J. KurzydÅowski,