TY - JOUR
T1 - Effects of Cr addition on Charpy impact energy in austenitic 0.45C-24Mn-(0,3,6)Cr steels
AU - Lee, Seok Gyu
AU - Kim, Bohee
AU - Jo, Min Cheol
AU - Kim, Kyeong Min
AU - Lee, Junghoon
AU - Bae, Jinho
AU - Lee, Byeong Joo
AU - Sohn, Seok Su
AU - Lee, Sunghak
N1 - Funding Information:
This work was supported financially by the Korea University Grant for the eighth author, the Ministry of Knowledge Economy (No. 10044574-2013-45), and the Brain Korea 21 Plus Project for Center for Creative Industrial materials. This work was supported by Korea Institute for Advancement of Technology (KIAT) grant funded by the Korea Government (MOTIE) (No. P0002020, The Competency Development Program for Industry Specialist).
Funding Information:
This work was supported financially by the Korea University Grant for the eighth author, the Ministry of Knowledge Economy (No. 10044574-2013-45 ), and the Brain Korea 21 Plus Project for Center for Creative Industrial materials . This work was supported by Korea Institute for Advancement of Technology (KIAT) grant funded by the Korea Government ( MOTIE ) (No. P0002020 , The Competency Development Program for Industry Specialist ).
Publisher Copyright:
© 2020
PY - 2020/8/1
Y1 - 2020/8/1
N2 - Effects of Cr addition (0, 3, and 6 wt%) on Charpy impact properties of Fe-C-Mn-Cr-based steels were studied by conducting dynamic compression tests at room and cryogenic temperatures. At room temperature, deformation mechanisms of Charpy impacted specimens were observed as twinning induced plasticity (TWIP) without any transformation induced plasticity (TRIP) in all the steels. At cryogenic temperature, many twins were populated in the Cr-added steels, but, interestingly, fine ε-martensite was found in the 0Cr steel, satisfying the Shoji-Nishiyama (S[sbnd]N) orientation relationship, {111}γ//{0002}ε and < 101 >γ//< 112¯0 >ε. Even though the cryogenic-temperature staking fault energies (SFEs) of the three steel were situated in the TWIP regime, the martensitic transformation was induced by Mn- and Cr-segregated bands. In the 0Cr steel, SFEs of low-(Mn,Cr) bands lay between the TWIP and TRIP regimes which were sensitively affected by a small change of SFE. The dynamic compressive test results well showed the relation between segregation bands and the SFEs. Effects of Cr were known as not only increasing the SFE but also promoting the carbide precipitation. In order to identify the possibility of carbide formation, a precipitation kinetics simulation was conducted, and the predicted fractions of precipitated M23C6 were negligible, 0.4–1.1 × 10−5, even at the low cooling rate of 10 °C/s.
AB - Effects of Cr addition (0, 3, and 6 wt%) on Charpy impact properties of Fe-C-Mn-Cr-based steels were studied by conducting dynamic compression tests at room and cryogenic temperatures. At room temperature, deformation mechanisms of Charpy impacted specimens were observed as twinning induced plasticity (TWIP) without any transformation induced plasticity (TRIP) in all the steels. At cryogenic temperature, many twins were populated in the Cr-added steels, but, interestingly, fine ε-martensite was found in the 0Cr steel, satisfying the Shoji-Nishiyama (S[sbnd]N) orientation relationship, {111}γ//{0002}ε and < 101 >γ//< 112¯0 >ε. Even though the cryogenic-temperature staking fault energies (SFEs) of the three steel were situated in the TWIP regime, the martensitic transformation was induced by Mn- and Cr-segregated bands. In the 0Cr steel, SFEs of low-(Mn,Cr) bands lay between the TWIP and TRIP regimes which were sensitively affected by a small change of SFE. The dynamic compressive test results well showed the relation between segregation bands and the SFEs. Effects of Cr were known as not only increasing the SFE but also promoting the carbide precipitation. In order to identify the possibility of carbide formation, a precipitation kinetics simulation was conducted, and the predicted fractions of precipitated M23C6 were negligible, 0.4–1.1 × 10−5, even at the low cooling rate of 10 °C/s.
KW - Austenitic high-Mn steels
KW - Charpy impact energy
KW - Split Hopkinson pressure bar
KW - Stacking fault energy (SFE)
KW - Transformation induced plasticity (TRIP)
KW - Twinning induced plasticity (TWIP)
UR - http://www.scopus.com/inward/record.url?scp=85081647337&partnerID=8YFLogxK
U2 - 10.1016/j.jmst.2019.12.032
DO - 10.1016/j.jmst.2019.12.032
M3 - Article
AN - SCOPUS:85081647337
VL - 50
SP - 21
EP - 30
JO - Journal of Materials Science and Technology
JF - Journal of Materials Science and Technology
SN - 1005-0302
ER -