TY - JOUR
T1 - Effect of boron on recrystallization behavior in ultra-low carbon martensitic steels
AU - Futamura, Yuichi
AU - Kawamura, Tomohiro
AU - Tsuchiyama, Toshihiro
AU - Takaki, Setsuo
N1 - Funding Information:
Research was supported by the National Institutes of Health (CA 47597, CA 53812) and Orion Research Center, and was performed during the tenure of a research Fellowship from the American Heart Association, California Affiliate, to Y.J.S. We thank Dr. E. Nissinen and T. Lotta, Orion-Farmos Pharmaceuticals, for providing physicochemical data on niteca-pone and OR-1246.
Funding Information:
Research was supported in part by National Institutes of Health Grants NS23307 and AG09690 and monies from the Glenn Foundation for Medical Research.
PY - 2003/3
Y1 - 2003/3
N2 - The microstructural change of lath martensite during tempering was investigated in ultra-low carbon 9%Cr-l%Ni-(0-80) ppmB martensitic steels, and then the effect of boron (B) content on the recrystallization behavior was discussed in terms of the relation between driving force and restraining force for grain boundary bulging. The addition of small amount of B is very effective for the increase in dislocation density of martensite. but excess addition more than 10 ppm is not so effective. Besides, the B addition works to reduce the spacing of carbide particles precipitated on grain boundaries with the increase in volume of the particles. The condition for the occurrence of the recrystallization is decided by the energy balance between the driving force (dislocation density) and the restraining force (grain boundary pinning). The recrystallization of martensite is promoted in the low B steel (0-40 ppm B) because the driving force is enlarged owing to the increase in the dislocation density. On the contrary, in the high B steel (40-80 ppmB), the restraining force becomes higher than the driving force because of the reduction of carbide spacing on grain boundaries, and this leads to a retardation of recrystallization.
AB - The microstructural change of lath martensite during tempering was investigated in ultra-low carbon 9%Cr-l%Ni-(0-80) ppmB martensitic steels, and then the effect of boron (B) content on the recrystallization behavior was discussed in terms of the relation between driving force and restraining force for grain boundary bulging. The addition of small amount of B is very effective for the increase in dislocation density of martensite. but excess addition more than 10 ppm is not so effective. Besides, the B addition works to reduce the spacing of carbide particles precipitated on grain boundaries with the increase in volume of the particles. The condition for the occurrence of the recrystallization is decided by the energy balance between the driving force (dislocation density) and the restraining force (grain boundary pinning). The recrystallization of martensite is promoted in the low B steel (0-40 ppm B) because the driving force is enlarged owing to the increase in the dislocation density. On the contrary, in the high B steel (40-80 ppmB), the restraining force becomes higher than the driving force because of the reduction of carbide spacing on grain boundaries, and this leads to a retardation of recrystallization.
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U2 - 10.2355/tetsutohagane1955.89.3_335
DO - 10.2355/tetsutohagane1955.89.3_335
M3 - Article
AN - SCOPUS:0042848695
SN - 0021-1575
VL - 89
SP - 335
EP - 341
JO - Tetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan
JF - Tetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan
IS - 3
ER -