Mechanical properties of Super 304H steel after long-term ageing at 650 and 700°C

The paper shows the degradation process of the modern austenitic Super 304H (X10CrNiCuNb18-9-3) steel which was subjected to long-term aging for up to 50,000 h at 650 and 700°C. The investigations include microstructure examination (SEM), identification and analysis of the precipitation process, and...

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Bibliographic Details
Published in:Bulletin of the Polish Academy of Sciences. Technical sciences 2023-04, Vol.71 (2)
Main Authors: Zieliński, Adam, Sroka, Marek, Purzyńska, Hanna, Novy, Frantisek
Format: Article
Language:English
Subjects:
ageing
Aging
Aging (metallurgy)
Austenitic stainless steels
Ductility
Mechanical properties
Plastic properties
Pollutants
Precipitates
Sigma phase
Steel
super 304h steel
Tensile strength
Yield strength
Yield stress
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Summary:The paper shows the degradation process of the modern austenitic Super 304H (X10CrNiCuNb18-9-3) steel which was subjected to long-term aging for up to 50,000 h at 650 and 700°C. The investigations include microstructure examination (SEM), identification and analysis of the precipitation process, and mechanical properties tests. The Super 304H steel has a structure characteristic of austenitic steels with visible annealing twins and single primary NbX precipitates. Long-term aging in the steel leads to numerous precipitation processes of M23C6, MX carbides, σ phase, Z phase, and -Cu phase. Precipitation processes lead to a decrease in plastic properties and impact energy as well as alloy over aging. Yield strength and tensile strength values after 50,000 h of aging were similar to those as delivered. The yield and tensile strength value strongly depend on the applied aging temperature.
ISSN:0239-7528
2300-1917
DOI:10.24425/bpasts.2023.144612