Influence of B and N on the microstructural characteristics and high-temperature strength of 9Cr-2W steel during an aging treatment
- Authors
- Jeong, Eun Hee; Kim, Jun Hwan; Kim, Sung Ho; Kim, Young Do
- Issue Date
- Jul-2017
- Publisher
- ELSEVIER SCIENCE SA
- Keywords
- 9Cr steel; Boron effect; Aging; Segregation; Nanoindentation; SIMS
- Citation
- MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, v.700, pp.701 - 706
- Indexed
- SCIE
SCOPUS
- Journal Title
- MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
- Volume
- 700
- Start Page
- 701
- End Page
- 706
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/19596
- DOI
- 10.1016/j.msea.2017.05.122
- ISSN
- 0921-5093
- Abstract
- The evolution of the microstructure and strength of sodium-cooled fast reactor (SFR) fuel cladding steel with different B and N contents based on 9Cr-2W steel after aged at 650 degrees C is experimentally investigated in this study. The strength and hardness of a cladding tube fabricated containing relatively more B (0.013 wt% B, 0.02 wt% N) remained mostly stable with an increase in the aging time. This demonstrated the cause of the suppression of the growth of M23C6; the depletion of carbon in the matrix was prevented when B diffused to the C position in M23C6, thereby stabilizing the microstructures. A cladding tube fabricated containing more N (0.004 wt% B, 0.0767 wt% N) formed fine MX precipitates which were twice as fine as the cladding tube containing more B in the as-received state. Thus, the initial strength and hardness in the sample with more N are greater than when more B is used. Although the initial strength and hardness with more N are higher those with more B, the strength and hardness after 7000 h of aging were low due to the rapid growth of the M23C6 in the main precipitates.
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