Effect of intermediate heat treatments on failure rates of boron-modified 9Cr-2 W steel tubes during drawing
- Authors
- Heo, Hyeong Min; Yeo, Sunghwan; Kim, Jun Hwan; Kim, Sung Ho; Kim, Jong Ryoul
- Issue Date
- Mar-2022
- Publisher
- Elsevier BV
- Keywords
- Boron-modified 9Cr-2Wsteel; Intermediate heat treatment; Boron segregation; Failure rate
- Citation
- Materials Today Communications, v.30, pp 1 - 4
- Pages
- 4
- Indexed
- SCIE
SCOPUS
- Journal Title
- Materials Today Communications
- Volume
- 30
- Start Page
- 1
- End Page
- 4
- URI
- https://scholarworks.bwise.kr/erica/handle/2021.sw.erica/107940
- DOI
- 10.1016/j.mtcomm.2022.103124
- ISSN
- 2352-4928
- Abstract
- 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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