Abstract
The effect of long-term aging for 1000…∼40,000 h at 650 °C on the tensile strength at ambient temperature was studied in a low-nitrogen and high-boron 10%Cr martensitic steel. In order to establish the reason for increasing the yield stress and ultimate tensile strength after 10,000 h of aging, the evolution of strengthening factors was analyzed. A decrease in the substructure and solid solution strengthening during long-term aging is compensated by an increase in the dispersion strengthening due to the precipitation of V-rich MX carbonitrides.
Highlights
New generation fossil power plants with higher thermal efficiency and reduced emission of carbon dioxide require the heat-resistant materials that operate at higher temperatures
A decrease in the substructure and solid solution strengthening during long-term aging is compensated by an increase in the dispersion strengthening due to the precipitation of V-rich MX carbonitrides
The creep resistance of these steels is associated with the stability of non-equilibrium structure, which is called the tempered martensite lath structure (TMLS)
Summary
New generation fossil power plants with higher thermal efficiency and reduced emission of carbon dioxide require the heat-resistant materials that operate at higher temperatures. The effect of long-term aging for 1000...~40,000 h at 650 °C on the tensile strength at ambient temperature was studied in a low-nitrogen and high-boron 10%Cr martensitic steel. In order to establish the reason for increasing the yield stress and ultimate tensile strength after 10,000 h of aging, the evolution of strengthening factors was analyzed.
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