TY - GEN
T1 - Difference in martensitic transformation behavior between carbon- and nitrogen-added metastable austenitic stainless steels
AU - Masumura, Takuro
AU - Nakada, Nobuo
AU - Tsuchiyama, Toshihiro
AU - Takaki, Setsuo
AU - Koyano, Tamotsu
AU - Adachi, Kazuhiko
PY - 2015
Y1 - 2015
N2 - In order to evaluate the effects of carbon and nitrogen additions on the stability of austenite, athermal and deformation-induced α'-martensitic transformation behaviors were investigated in type 304 metastable austenitic stainless steels containing 0.1 mass% carbon or nitrogen. Since carbon-added steel has a lower stacking-fault energy (SFE) than nitrogen-added steel, deformation-twin and e-martensite were preferentially formed in carbon-added steel, whereas a dislocation cell structure developed in nitrogen-added steel. Crystallographic analysis using electron backscatter diffraction method revealed that the difference in the deformation microstructure has a significant influence on the growth behavior of deformation-induced α'-martensite. The interface of the deformation-twin and e-martensite completely suppress the growth of α'-martensite, whereas dislocation cell boundaries have little influence on that. As a result, the mechanical stability of carbon-added steel is slightly higher than that of nitrogen-added steel, although the thermal stabilization effect of carbon is much lower than that of nitrogen.
AB - In order to evaluate the effects of carbon and nitrogen additions on the stability of austenite, athermal and deformation-induced α'-martensitic transformation behaviors were investigated in type 304 metastable austenitic stainless steels containing 0.1 mass% carbon or nitrogen. Since carbon-added steel has a lower stacking-fault energy (SFE) than nitrogen-added steel, deformation-twin and e-martensite were preferentially formed in carbon-added steel, whereas a dislocation cell structure developed in nitrogen-added steel. Crystallographic analysis using electron backscatter diffraction method revealed that the difference in the deformation microstructure has a significant influence on the growth behavior of deformation-induced α'-martensite. The interface of the deformation-twin and e-martensite completely suppress the growth of α'-martensite, whereas dislocation cell boundaries have little influence on that. As a result, the mechanical stability of carbon-added steel is slightly higher than that of nitrogen-added steel, although the thermal stabilization effect of carbon is much lower than that of nitrogen.
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M3 - Conference contribution
AN - SCOPUS:84962640250
T3 - PTM 2015 - Proceedings of the International Conference on Solid-Solid Phase Transformations in Inorganic Materials 2015
SP - 591
EP - 592
BT - PTM 2015 - Proceedings of the International Conference on Solid-Solid Phase Transformations in Inorganic Materials 2015
A2 - Chen, Long-Qing
A2 - Militzer, Matthias
A2 - Botton, Gianluigi
A2 - Howe, James
A2 - Sinclair, Chadwick
A2 - Zurob, Hatem
PB - International Conference on Solid-Solid Phase Transformations in Inorganic Materials 2015
T2 - International Conference on Solid-Solid Phase Transformations in Inorganic Materials 2015, PTM 2015
Y2 - 28 June 2015 through 3 July 2015
ER -