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- Title
Austenite Grain Size Prediction in the Coarse-Grained Heat-Affected Zone of the Developed Cu-Free High-Strength Low-Alloy Hull Structure Steel.
- Authors
Lei, Xuan-Wei; Zhou, Shuan-Bao; Huang, Ji-Hua
- Abstract
The developed Cu-free high-strength low-alloy (HSLA) hull structure steel has wide potential applications because of its strength, good low-temperature toughness, and satisfactory weldability. As a significant part of microstructure characterization, austenite grain size in the coarse-grained heat-affected zone (CGHAZ) of this steel has not been investigated in any previous study. The present work has developed an equation considering the driving pressure and Zener pinning pressure to predict the austenite grain size in the CGHAZ of this developed Cu-free HSLA hull structure steel based on experimental data. In this equation, Zener pinning pressure is taken as a constant because of the high thermal stability of precipitate type I and relatively low thermal stability of precipitate type II in this steel. The results show this equation is applicable under heat input of 7.1 to 71.4 kJ/cm with peak temperature 1623 K to 1673 K (1350 °C to 1400 °C). In both theory and practice, the method for austenite grain size prediction in CGHAZ can be used for other steels that contain precipitates with similar properties.
- Subjects
GRAIN size; HIGH strength steel; AUSTENITE; WELDABILITY; STEEL; THERMAL stability
- Publication
Metallurgical & Materials Transactions. Part A, 2020, Vol 51, Issue 4, p1665
- ISSN
1073-5623
- Publication type
Article
- DOI
10.1007/s11661-020-05636-0