Influence of B and N on the microstructural characteristics and high-temperature strength of 9Cr-2W steel during an aging treatment
- Title
- Influence of B and N on the microstructural characteristics and high-temperature strength of 9Cr-2W steel during an aging treatment
- Author
- 김영도
- Keywords
- 9Cr steel; Boron effect; Aging; Segregation; Nanoindentation; SIMS
- Issue Date
- 2017-07
- Publisher
- ELSEVIER SCIENCE SA
- Citation
- MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, v. 700, page. 701-706
- 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.
- URI
- https://www.sciencedirect.com/science/article/abs/pii/S0921509317307815?via%3Dihubhttps://repository.hanyang.ac.kr/handle/20.500.11754/114826
- ISSN
- 0921-5093; 1873-4936
- DOI
- 10.1016/j.msea.2017.05.122
- Appears in Collections:
- COLLEGE OF ENGINEERING[S](공과대학) > MATERIALS SCIENCE AND ENGINEERING(신소재공학부) > Articles
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