TY - JOUR
T1 - Microstructure evolution in dual-phase stainless steel during severe deformation
AU - Belyakov, A.
AU - Kimura, Y.
AU - Tsuzaki, K.
N1 - Funding Information:
The authors are grateful to Drs. N. Sakuma, T. Hibaru, S. Kuroda and M. Kobayashi of the Steel Research Center, National Institute for Materials Science, for their assistance in the materials processing and to Ms. J. Hono, National Institute for Materials Science, for improving the language of the paper. One of the authors (A.B.) would like to express his thanks to the National Institute for Materials Science for providing a scientific fellowship.
PY - 2006/5
Y1 - 2006/5
N2 - Deformation microstructures of an Fe-27% Cr-9% Ni dual-phase stainless steel, which was bar rolled/swaged to a total strain of 6.9 at ambient temperature, were studied. After a rapid increase in the hardness during early deformation, the rate of strain hardening slowed and produced a steady-state-like deformation behaviour at strains above 4. The severe deformation resulted in the evolution of similar microstructures in both austenite and ferrite consisting of elongated (sub)grains with a final transverse size of about 0.1 μm and about 70% of high-angle (sub)boundaries. However, the different phases were characterised by different structural change kinetics. The ferrite transverse (sub)grain size decreased continuously, approaching its minimum at large strains above 5.0, while the distinct grain subdivision in the austenite reduced the transverse (sub)grain size to its final value quickly at an early processing stage. The main mechanism of microstructure evolution during the large strain processing was considered to be micro-shearing with dynamic recovery.
AB - Deformation microstructures of an Fe-27% Cr-9% Ni dual-phase stainless steel, which was bar rolled/swaged to a total strain of 6.9 at ambient temperature, were studied. After a rapid increase in the hardness during early deformation, the rate of strain hardening slowed and produced a steady-state-like deformation behaviour at strains above 4. The severe deformation resulted in the evolution of similar microstructures in both austenite and ferrite consisting of elongated (sub)grains with a final transverse size of about 0.1 μm and about 70% of high-angle (sub)boundaries. However, the different phases were characterised by different structural change kinetics. The ferrite transverse (sub)grain size decreased continuously, approaching its minimum at large strains above 5.0, while the distinct grain subdivision in the austenite reduced the transverse (sub)grain size to its final value quickly at an early processing stage. The main mechanism of microstructure evolution during the large strain processing was considered to be micro-shearing with dynamic recovery.
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U2 - 10.1016/j.actamat.2006.01.035
DO - 10.1016/j.actamat.2006.01.035
M3 - Article
AN - SCOPUS:33646164898
SN - 1359-6454
VL - 54
SP - 2521
EP - 2532
JO - Acta Materialia
JF - Acta Materialia
IS - 9
ER -