Effect of intermediate heat treatments on failure rates of boron-modified 9Cr-2 W steel tubes during drawing
- Title
- Effect of intermediate heat treatments on failure rates of boron-modified 9Cr-2 W steel tubes during drawing
- Author
- 김종렬
- Keywords
- Boron-modified 9Cr-2Wsteel; Intermediate heat treatment; Boron segregation; Failure rate
- Issue Date
- 2022-03
- Publisher
- ELSEVIER
- Citation
- MATERIALS TODAY COMMUNICATIONS, v. 30, article no. 103124, Page. 1-4
- 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.
- URI
- https://www.sciencedirect.com/science/article/pii/S2352492822000022?via%3Dihubhttps://repository.hanyang.ac.kr/handle/20.500.11754/182931
- ISSN
- 2352-4928;2352-4928
- DOI
- 10.1016/j.mtcomm.2022.103124
- Appears in Collections:
- COLLEGE OF ENGINEERING SCIENCES[E](공학대학) > MATERIALS SCIENCE AND CHEMICAL ENGINEERING(재료화학공학과) > Articles
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