https://www.tandfonline.com/doi/pdf/10.1088/1468-6996/9/1/013002

Precipitate design for creep strengthening of 9% Cr tempered martensitic steel for ultra-supercritical power plants

A critical review on dissimilar welds joint between martensitic and austenitic steel for power plant application

Long-term creep rupture strengths and the microstructural stability of ASME P92 and P122 pipes have been studied using creep testing at the temperatures from 550 to 700 °C and detailed scanning transmission electron microscopy Creep rupture strength of P92 is found to be more stable than that of P122 at temperatures over 600 °C, which is mainly due to the difference in their Cr content P122 type model steel with reduced Cr content, 9%Cr, has been prepared to explore the effect of Cr on the stability of MX and formation of Z-phase during creep deformation MX in 9%Cr steel is found to be stable even after prolonged exposure at 650 °C, while Cr and Fe concentration to MX without marked coarsening has been observed in 105%Cr steel after aging for 10,000 h at 650 °C This seems to lead to the transition of MX carbonitride into the Z-phase after aging for 23,000 h, which requires ordering in a M 2 N lattice to achieve a tetragonal Z-phase to be stable Creep deformation behavior in the transient creep region of the steels is almost same up to about 7000 h, while in the acceleration creep region the creep rate of 105%Cr steel becomes much faster than that of 9%Cr steel, resulting in shorter rupture life It is obvious that the creep rupture strength degradation starts prior to the formation of Z-phase in 105%Cr steel It is thus concluded that Z-phase is not a necessary factor for degradation of creep rupture strength but the instability of the fine precipitates such as Cr 2 (C, N) caused by the compositions change like Cr supply to MX carbonitride is more essential

Effect of precipitates on long-term creep deformation properties of P92 and P122 type advanced ferritic steels for USC power plants

Advanced Heat Resistant Steels for Power Generation

Effect of tempering temperature on the toughness of 9Cr–3W–3Co martensitic heat resistant steel

The research and development project of National Institute for Materials Science (NIMS) for advanced ferritic heat resistant steels for 650°C ultra super critical (USC) plants, revealed that the addition of >0·01 mass% boron to a 0·08C–9Cr–3W–3Co–V–Nb–,0·003N steel remarkably improves the long term creep strength. Boron enriched in M23C6 carbides near prior austenite grain boundaries suppresses the coarsening of carbides during creep deformation, leading to excellent microstructural stability and creep strength. If creep strength was further improved by the addition of nitrogen, it was found to enhance precipitation of fine MX. Addition of excess nitrogen to the high boron containing steel was found to reduce creep rupture lives and ductility. This results from a decrease in the amount of effective boron, which is dissolved in M23C6 and suppresses its coarsening, resulting from the formation of coarse BN at normalising temperature. The highest creep strength is obtained with steel of the following...

Alloy design and creep strength of advanced 9%Cr USC boiler steels containing high concentration of boron

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Alloy design and creep strength of advanced 9%Cr USC boiler steels containing high concentration of boron