Mechanical properties and corrosion resistance of ultrafine grained austenitic stainless steel processed by hydrostatic extrusion
PBN-AR
Instytucja
Instytut Wysokich Ciśnień Polskiej Akademii Nauk
Informacje podstawowe
Główny język publikacji
angielski
Czasopismo
MATERIALS & DESIGN (35pkt w roku publikacji)
ISSN
0261-3069
EISSN
Wydawca
ELSEVIER SCI LTD
DOI
URL
Rok publikacji
2017
Numer zeszytu
Strony od-do
34-44
Numer tomu
136
Identyfikator DOI
Liczba arkuszy
1,9
Słowa kluczowe
angielski
Austenitic stainless steel
Hydrostatic extrusion
Severe plastic deformation
Dynamic recrystallization
Corrosion resistance
Streszczenia
Język
angielski
Treść
The material studied is a commercially available 316LVM stainless steel with an initial grain size of 30 μm. To refine the microstructure down to the nanoscale, hot (at 1000 °C) and room temperature hydrostatic extrusion were applied with a total true strain of 1.4. An annealed sample with coarse grains of 35 μm in diameter was used as a reference sample. The results indicate that after hot hydrostatic extrusion, the microstructure consisted mainly of cells with tangled dislocation walls, while after room temperature hydrostatic extrusion, twins of various width and shear bands could be distinguished. Hydrostatic extrusion is also an efficient way to tailor the corrosion resistance and mechanical properties of 316LVM stainless steel. Performed at room temperature, hydrostatic extrusion resulted in an ultra-high-strength material with limited but sufficient ductility. Performed at high temperature, hydrostatic extrusion resulted in a material with a very good combination of strength (approximately 900 MPa) and ductility (elongation to failure higher than 20%). Both hydrostatically extruded steels maintained good passivation behavior in 0.1 M H2SO4. In the presence of chloride ions, susceptibility to localized attack increased for the steel extruded at room temperature, but did not change for the hot-extruded steel.
Inne
System-identifier
PX-5a8ed319d5dee0db7bca5bb4
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