期刊
MATERIALS TODAY COMMUNICATIONS
卷 30, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.mtcomm.2022.103124
关键词
Boron-modified 9Cr-2Wsteel; Intermediate heat treatment; Boron segregation; Failure rate
资金
- National Nuclear Research and Development Program - Ministry of Science and ICT, Republic of Korea [2021M2E2A2081066]
- National Research Foundation of Korea [2021M2E2A2081066] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
This study investigates the grain structure, particle segregation, and texture of boron-modified 9Cr-2W steel tubes obtained through different heat treatments. The results show that the normalized heat-treated tubes exhibit improved grain structure and texture development, leading to a significant reduction in failure rate.
The manufacturing process of a cladding tube comprises cold pilgering, intermediate heat treatment, and drawing. Intermediate heat treatment after pilgering can result in failure during drawing. In this study, boron-modified 9Cr-2Wsteel tubes obtained via various heat treatments are investigated for their grain structure, secondary particle segregation, and texture. Elongated grains are observed in as-pilgered and tempered tubes, whereas normalized as well as normalized and tempered tubes exhibit equiaxed grain structures owing to a phase transformation from gamma to alpha'. Even though boron segregations are observed in all the tubes subjected to heat treatment, carbon and chromium segregations decreased in the normalized heat-treated tubes. Inverse pole figure and orientation distribution function texture studies indicate that the normalized tubes show the preferred texture direction, and that both alpha- and gamma-fibers developed equally for numerous slip bands. Finally, the failure rate of the as-pilgered tubes (approximately 90%) reduced significantly to 32% after normalized heat treatment, whereas the failure rate of the tempered tubes is comparable to that of the as-pilgered tubes.
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