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Static CCT Curve Measurement and Microstructure Analysis of 18CrNiMo7-6 Steel
- Source :
- Teshugang, Vol 45, Iss 3, Pp 91-95 (2024)
- Publication Year :
- 2024
- Publisher :
- Editorial Office of Special Steel, 2024.
-
Abstract
- The continuous cooling expansion curve of 18CrNiMo7-6 wind power steel was tested by using a Gleeble-3800 thermal simulator at a cooling rate of 0. 1-30 ℃/s. The static continuous cooling transformation curve (CCT curve) of 18CrNiMo7-6 wind power steel was plotted by using metallographic hardness method. The microstructure transformation law of 18CrNiMo7-6 wind power steel under different cooling rate conditions was analyzed. The experimental results show that the Ac1 phase transition temperature of 18CrNiMo7-6 wind power steel is 765 ℃, and the Ac3 phase transition tempera ture is 843 ℃. When the cooling rate is less than 0. 5 ℃/s, the microstructure of the experimental steel is ferrite and pearlite, and high-temperature phase transformation occurs; At a cooling rate of 0. 5-1 ℃/s, ferrite disappears and plate-like martensite is initially formed; Starting from 2 ℃/s, the microstructure is mainly bainite and martensite, with both medium temperature and low temperature phase transformations occurring simultaneously; After 10 ℃/s, the bainite content de creases and the martensite content increases with the increase of cooling rate; When the cooling rate is greater than 20 ℃/s, the microstructure is entirely martensitic with only low-temperature phase transformation occurring; During the process of increasing the cooling rate from 0. 1 ℃/s to 30 ℃/s, the hardness of the wind power steel shows an upward trend.
Details
- Language :
- Chinese
- ISSN :
- 10038620
- Volume :
- 45
- Issue :
- 3
- Database :
- Directory of Open Access Journals
- Journal :
- Teshugang
- Publication Type :
- Academic Journal
- Accession number :
- edsdoj.7d38999ab2b49bd957ab1b4a6777f7d
- Document Type :
- article
- Full Text :
- https://doi.org/10.20057/j.1003-8620.2023-00212