TY - JOUR
T1 - Microstructural study of an age hardenable martensitic steel deformed by equal channel angular pressing
AU - Mobarake, M. Iranpour
AU - Nili-Ahmadabadi, M.
AU - Poorganji, B.
AU - Fatehi, A.
AU - Shirazi, H.
AU - Furuhara, Tadashi
AU - Parsa, Habibi
AU - Nedjad, S. Hossein
PY - 2008/9/15
Y1 - 2008/9/15
N2 - Effect of large-strain deformation by equal channel angular pressing on the microstructure of a martensitic age hardenable steel, namely 18 Ni (3 0 0) maraging steel, was studied by means of transmission electron microscopy. Equal channel angular pressing was carried out on the solution-annealed steel up to four passes at room temperature through the route Bc using a die with an inner angle of 90°. It was found that the initial martensitic structure of the solution-annealed steel evolves to a heterogeneously deformed structure consisting of ultrafine grains and lamellar dislocation cell blocks. Selected-area electron diffraction patterns revealed large orientation spread within the deformed structure. High density of dislocations and elastic lattice distortions were found in the deformed and aged microstructures.
AB - Effect of large-strain deformation by equal channel angular pressing on the microstructure of a martensitic age hardenable steel, namely 18 Ni (3 0 0) maraging steel, was studied by means of transmission electron microscopy. Equal channel angular pressing was carried out on the solution-annealed steel up to four passes at room temperature through the route Bc using a die with an inner angle of 90°. It was found that the initial martensitic structure of the solution-annealed steel evolves to a heterogeneously deformed structure consisting of ultrafine grains and lamellar dislocation cell blocks. Selected-area electron diffraction patterns revealed large orientation spread within the deformed structure. High density of dislocations and elastic lattice distortions were found in the deformed and aged microstructures.
KW - Equal channel angular pressing
KW - Maraging steel
KW - Martensite
KW - Ultrafine grain
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U2 - 10.1016/j.msea.2008.02.034
DO - 10.1016/j.msea.2008.02.034
M3 - Article
AN - SCOPUS:46049107523
VL - 491
SP - 172
EP - 176
JO - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
JF - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
SN - 0921-5093
IS - 1-2
ER -