Influence of Heat Treatment on the Workability of Modified 9Cr-2W Steel with Higher B Content
- Title
- Influence of Heat Treatment on the Workability of Modified 9Cr-2W Steel with Higher B Content
- Author
- 김종렬
- Keywords
- modified 9Cr-2W steel; B content; phase transformation; texture; heat treatment
- Issue Date
- 2019-08
- Publisher
- MDPI
- Citation
- METALS, v. 9, NO. 8, article no. 904, Page. 1-15
- Abstract
- In this study, the effect of heat treatment on the fracture behavior of alloy B steel with boron (B) contents as high as 130 ppm was investigated. The Alloy B are derived from Gr.92 steel with outstanding creep characteristics. The amounts of minor alloying elements such as B, N, Nb, Ta, and C were optimized to achieve better mechanical properties at high temperatures. Hence, workability of the alloy B and Gr.92 were compared. An increase in the B content affected the phase transformation temperature and texture of the steel. The development of the {111} components in gamma-fibers depended on the austenite fraction of the steel after the phase transformation. An increase in the B content of the steel increased its alpha-to-gamma phase transformation temperature, thus preventing the occurrence of sufficient transformation under the normalizing condition. Cracks occurred at the point of the elastic-to-plastic deformation transition in the normal direction during the rolling process, thereby resulting in failure. Therefore, it is necessary to avoid intermediate heat treatment conditions, in which gamma-fibers do not fully develop, i.e., to avoid an imperfect normalization.
- URI
- https://www.mdpi.com/2075-4701/9/8/904https://repository.hanyang.ac.kr/handle/20.500.11754/182963
- ISSN
- 2075-4701;2075-4701
- DOI
- 10.3390/met9080904
- Appears in Collections:
- COLLEGE OF ENGINEERING SCIENCES[E](공학대학) > MATERIALS SCIENCE AND CHEMICAL ENGINEERING(재료화학공학과) > Articles
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