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- W2565007796 abstract "Abstract SA508Gr4 is a newly developed high-strength steel for nuclear reactor pressure vessels. Its welding characteristics remain largely unexplored. In this work, the simulated heat affected zone continuous cooling transformation (SH-CCT) diagram of SA508Gr4 steel was constructed and the high-temperature cooling phase compositions and the properties of the heat affected zone (HAZ) were characterized using dilatometry and microscopic tests. The results show that the phase transformation in the HAZ was divided into bainite and martensite transformation stages. When 4.6 ≤ t 8/5 (the HAZ cooling time from 800 °C to 500 °C) ≤ 15 s, lath-shaped martensite was fully developed, resulting in extensive hardening and cold cracking in the HAZ, while the cooling time required to form the bainite completely exceeds 1 200 s. Thus, to improve weld quality, preheating to 196 °C or higher is recommended." @default.
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- W2565007796 date "2017-01-31" @default.
- W2565007796 modified "2023-10-10" @default.
- W2565007796 title "Study on the welding continuous cooling transformation and weldability of SA508Gr4 steel for nuclear pressure vessels" @default.
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- W2565007796 doi "https://doi.org/10.3139/146.111462" @default.
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