TY - JOUR
T1 - Effects of alloying elements and thermomechanical treatment on 9Cr Reduced Activation Ferritic-Martensitic (RAFM) steels
AU - Tan, L.
AU - Yang, Y.
AU - Busby, J. T.
PY - 2013
Y1 - 2013
N2 - RAFM steels are one of the candidate structural materials for fusion reactors, in which tantalum (Ta) and tungsten (W) are alloyed to replace niobium (Nb) and molybdenum (Mo) in conventional FM steels, respectively. This paper, using three RAFM heats, presents the effects of Ta and the primary austenite stabilizer carbon (C) on microstructure and strength. Thermomechanical treatment (TMT) was also applied to the heats, leading to significant increases in strength, attributable to the TMT-refined sub-grains and precipitates. The Ta-alloying favored the formation of (V, Ta)(N, C) and (Ta, V)C and exhibited greater strength. Fractographs also revealed the beneficial effects of TMT and Ta-alloying. However, extra C content, favoring a larger amount of M 23C6 precipitates, did not show strengthening effect.
AB - RAFM steels are one of the candidate structural materials for fusion reactors, in which tantalum (Ta) and tungsten (W) are alloyed to replace niobium (Nb) and molybdenum (Mo) in conventional FM steels, respectively. This paper, using three RAFM heats, presents the effects of Ta and the primary austenite stabilizer carbon (C) on microstructure and strength. Thermomechanical treatment (TMT) was also applied to the heats, leading to significant increases in strength, attributable to the TMT-refined sub-grains and precipitates. The Ta-alloying favored the formation of (V, Ta)(N, C) and (Ta, V)C and exhibited greater strength. Fractographs also revealed the beneficial effects of TMT and Ta-alloying. However, extra C content, favoring a larger amount of M 23C6 precipitates, did not show strengthening effect.
UR - http://www.scopus.com/inward/record.url?scp=84884904648&partnerID=8YFLogxK
U2 - 10.1016/j.jnucmat.2012.10.015
DO - 10.1016/j.jnucmat.2012.10.015
M3 - Article
AN - SCOPUS:84884904648
SN - 0022-3115
VL - 442
SP - S13-S17
JO - Journal of Nuclear Materials
JF - Journal of Nuclear Materials
IS - 1-3 SUPPL.1
ER -