TY - JOUR
T1 - Comparison of microstructure and hardness between high-carbon and high-nitrogen martensites
AU - Tsuchiyama, Toshihiro
AU - Inoue, Kurato
AU - Hyodo, Katsutoshi
AU - Akama, Daichi
AU - Nakada, Nobuo
AU - Takaki, Setsuo
AU - Koyano, Tamotsu
N1 - Publisher Copyright:
© 2018 Iron and Steel Institute of Japan. All rights reserved.
Copyright:
Copyright 2019 Elsevier B.V., All rights reserved.
PY - 2019/1
Y1 - 2019/1
N2 - The microstructure and hardness of martensite in Fe-C and Fe-N alloys with up to 7.5 at% contents of carbon and nitrogen, respectively, were compared. Their difference in hardness was discussed based on four strengthening mechanisms. The martensitic structures of Fe-C and Fe-N alloys with equal contents of carbon and nitrogen, respectively, were nearly identical, except for the amount of retained austenite. Furthermore, Fe-C alloy was considerably harder than Fe-N alloy. This discrepancy gradually increased with carbon and nitrogen contents. The enhanced hardness of Fe-C alloy martensite was attributed to its higher dislocation density and the stronger pinning force of interstitial carbon atoms on dislocations.
AB - The microstructure and hardness of martensite in Fe-C and Fe-N alloys with up to 7.5 at% contents of carbon and nitrogen, respectively, were compared. Their difference in hardness was discussed based on four strengthening mechanisms. The martensitic structures of Fe-C and Fe-N alloys with equal contents of carbon and nitrogen, respectively, were nearly identical, except for the amount of retained austenite. Furthermore, Fe-C alloy was considerably harder than Fe-N alloy. This discrepancy gradually increased with carbon and nitrogen contents. The enhanced hardness of Fe-C alloy martensite was attributed to its higher dislocation density and the stronger pinning force of interstitial carbon atoms on dislocations.
UR - http://www.scopus.com/inward/record.url?scp=85060701227&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85060701227&partnerID=8YFLogxK
U2 - 10.2355/isijinternational.ISIJINT-2018-404
DO - 10.2355/isijinternational.ISIJINT-2018-404
M3 - Article
AN - SCOPUS:85060701227
SN - 0915-1559
VL - 59
SP - 161
EP - 168
JO - Transactions of the Iron and Steel Institute of Japan
JF - Transactions of the Iron and Steel Institute of Japan
ER -