Effects of alloying elements and thermomechanical treatment on 9Cr Reduced Activation Ferritic-Martensitic (RAFM) steels

被引：86
作者：
Tan, L. [1 ]
Yang, Y. [1 ]
Busby, J. T. [1 ]
机构：
[1] Oak Ridge Natl Lab, Oak Ridge, TN USA
来源：
JOURNAL OF NUCLEAR MATERIALS | 2013年 / 442卷 / 1-3期
关键词：
D O I：
10.1016/j.jnucmat.2012.10.015
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
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 M23C6 precipitates, did not show strengthening effect. (C) 2012 Elsevier B. V. All rights reserved.
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页码：S13 / S17
页数：5
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