![]() Johnson-Mehl-Avrami indicated that the nucleation rate of the Mo-rich Laves phase decreases after aging for 6000 h. The area fraction of the Mo-rich Laves phase dropped slightly from 6000 h to 10,000 h. The size of the Mo-rich Laves phase increased continuously until the aging time of 10,000 h and reached 410 nm. ![]() The number of Mo-rich Laves phase decreased rapidly from 6000 h to 8000 h and then remained the same level up to 10,000 h. It experimentally assessed the evolution of number, size, and area fraction of Mo-rich Laves phase increased simultaneously with aging time from 2000 h to 6000 h. The analysis of EDS and results of APT revealed that the nucleation of Mo-rich Laves phase near the M 23C 6 carbides should be attributed to the segregation of P and Si atoms at the M 23C 6 carbides/martensite interfaces. Then, Laves phase particles were found at other sites such as packet boundaries, block boundaries, and lath boundaries. Experimental results showed that Mo-rich Laves phase particles were observed at grain boundaries adjacent to M 23C 6 after aging for 2000 h. In this paper, precipitation and evolution of Mo-rich Laves phase were investigated during thermal aging at 620 ☌ in 9.5Cr-1.5MoCoVNbNB steel.
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