| Abstract |
| This paper investigates the influence of aging time on creep properties via a small punch creep test and evaluates the microstructural change of P122 steel at 600℃. The area fraction of precipitates was quantitatively analyzed to identify the relationship between the creep rupture life and precipitates. The coarsening behavior of precipitates along the grain boundaries was also investigated for various aging times. It is found that this coarsening behavior led to a loss of solution hardening and resulted in a hardness drop and a reduction of creep life. |
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| Key Words |
| P122, ultra super critical power plant, creep, small punch, martensite, precipitates, aging, coarsening, Laves phase, prior austenite grain boundary, sub-grain |
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