TY - JOUR
T1 - Toughening mechanism in 5%Mn and 10%Mn martensitic steels treated by thermo-mechanical control process
AU - Maeda, Takuya
AU - Okuhata, Shohei
AU - Matsuda, Kyosuke
AU - Masumura, Takuro
AU - Tsuchiyama, Toshihiro
AU - Shirahata, Hiroyuki
AU - Kawamoto, Yuzo
AU - Fujioka, Masaaki
AU - Uemori, Ryuji
N1 - Publisher Copyright:
© 2021 Elsevier B.V.
PY - 2021/4/22
Y1 - 2021/4/22
N2 - A thermomechanical control process (TMCP) was performed for two types of medium-Mn martensitic steels to investigate the effect of microstructure control on fracture behavior. The TMCPed 5%Mn-0.1%C steel (mass%) exhibited a slight improvement in toughness, and the partially occurring intergranular fracture was suppressed completely owing to the elongated prior austenite grains. On the other hand, the TMCPed 10%Mn-0.1%C steel exhibited a remarkably enhanced low-temperature toughness with separation, in which a large number of sub-cracks were observed parallel to the impact direction on the main fracture surface. The separation induced by the elongated prior austenite grains reduced the triaxial stress at the crack tip, which in turn contributed to improved toughness. Furthermore, the ultra-refined microstructure obtained by the combination of the γ → ε → α’ martensitic transformation and TMCP without recrystallization improved the toughness of 10%Mn-0.1%C steel.
AB - A thermomechanical control process (TMCP) was performed for two types of medium-Mn martensitic steels to investigate the effect of microstructure control on fracture behavior. The TMCPed 5%Mn-0.1%C steel (mass%) exhibited a slight improvement in toughness, and the partially occurring intergranular fracture was suppressed completely owing to the elongated prior austenite grains. On the other hand, the TMCPed 10%Mn-0.1%C steel exhibited a remarkably enhanced low-temperature toughness with separation, in which a large number of sub-cracks were observed parallel to the impact direction on the main fracture surface. The separation induced by the elongated prior austenite grains reduced the triaxial stress at the crack tip, which in turn contributed to improved toughness. Furthermore, the ultra-refined microstructure obtained by the combination of the γ → ε → α’ martensitic transformation and TMCP without recrystallization improved the toughness of 10%Mn-0.1%C steel.
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U2 - 10.1016/j.msea.2021.141058
DO - 10.1016/j.msea.2021.141058
M3 - Article
AN - SCOPUS:85103087409
VL - 812
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
M1 - 141058
ER -