TY - JOUR
T1 - Effect of low temperature aging on hall-petch coefficient in ferritic steels containing a small amount of carbon and nitrogen
AU - Araki, Satoshi
AU - Fujii, Kohei
AU - Akama, Daichi
AU - Tsuchiyama, Toshihiro
AU - Takaki, Setsuo
AU - Ohmura, Takahito
AU - Takahashi, Jun
N1 - Funding Information:
This work was supported by JSPS KAKENHI Grant
PY - 2018/10
Y1 - 2018/10
N2 - In this study, the effect of aging treatment at 373 K on Hall–Petch coefficient (ky) was investigated by considering the change in friction stress associated with carbide/nitride precipitation in ferritic steels containing 60 mass ppm carbon or nitrogen (C60 and N60). Tensile tests revealed that the ky monotonously increased with increasing aging time in both steels. Additionally, C60 exhibited a ky value exceeding that of N60 with respect to the same aging time. The results of the 3DAP analysis and theoretical calculation for the grain boundary segregation of carbon and nitrogen indicated that the ky corresponded to the amount of carbon and nitrogen existing at the grain boundary. No difference in the effect on increments in ky between the two elements was observed. The increase in ky in C60 under the same aging condition was due to the higher amount of segregated carbon when compared with that of nitrogen.
AB - In this study, the effect of aging treatment at 373 K on Hall–Petch coefficient (ky) was investigated by considering the change in friction stress associated with carbide/nitride precipitation in ferritic steels containing 60 mass ppm carbon or nitrogen (C60 and N60). Tensile tests revealed that the ky monotonously increased with increasing aging time in both steels. Additionally, C60 exhibited a ky value exceeding that of N60 with respect to the same aging time. The results of the 3DAP analysis and theoretical calculation for the grain boundary segregation of carbon and nitrogen indicated that the ky corresponded to the amount of carbon and nitrogen existing at the grain boundary. No difference in the effect on increments in ky between the two elements was observed. The increase in ky in C60 under the same aging condition was due to the higher amount of segregated carbon when compared with that of nitrogen.
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U2 - 10.2355/isijinternational.ISIJINT-2018-130
DO - 10.2355/isijinternational.ISIJINT-2018-130
M3 - Article
AN - SCOPUS:85055141502
VL - 58
SP - 1920
EP - 1926
JO - Transactions of the Iron and Steel Institute of Japan
JF - Transactions of the Iron and Steel Institute of Japan
SN - 0915-1559
IS - 10
ER -