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- Title
Effect of Welding Heat Input on the Microstructure and Toughness in Simulated CGHAZ of 800 MPa-Grade Steel for Hydropower Penstocks.
- Authors
Qingfeng Ding; Tiansheng Wang; Zhongran Shi; Qian Wang; Qingfeng Wang; Fucheng Zhang
- Abstract
To determine the appropriate welding heat input for simulated coarse grained heat affected zone (CGHAZ) of 800 MPa-grade steel used in hydropower penstocks, the microstructural evolution, hardness, and 50% fraction appearance transition temperature (50% FATT) were investigated. The results indicated that when the cooling rate (heat input) is reduced (increased), the impact toughness at -20°C and hardness of the simulated CGHAZ decreased. When the heat input increased from 18 to 81 kJ/cm, the 50% FATT increased from -80°C to -11°C. At 18 kJ/cm, the microstructures consisted of lath bainite and granular bainite, but lath bainite decreased with increasing heat input. The increase in the 50% FATT was attributed mainly to an increase in the austenite grain size and effective grain size, and a decrease in lath bainite and the fraction of HAGBs (misorientation: ≥15°).
- Subjects
METAL microstructure; FRACTURE toughness; WELDING; STEEL; PENSTOCKS; WATER power
- Publication
Metals (2075-4701), 2017, Vol 7, Issue 4, p115
- ISSN
2075-4701
- Publication type
Article
- DOI
10.3390/met7040115