Small Punch Creep Studies for Optimization of Nitrogen Content in 316LN SS for Enhanced Creep Resistance

Small Punch Creep Studies for Optimization of Nitrogen Content in 316LN SS for Enhanced Creep Resistance

Small punch creep (SPC) studies have been carried out to evaluate the creep properties of 316LN stainless steel (SS) at 923 K (650 °C) at various stress levels. The results have been compared with uniaxial creep rupture data obtained from conventional creep tests. The minimum deflection rate was fou...

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Veröffentlicht in:Metallurgical and materials transactions. A, Physical metallurgy and materials science Physical metallurgy and materials science, 2014-02, Vol.45 (2), p.731-737
Hauptverfasser: Mathew, M. D., Ganesh Kumar, J., Ganesan, V., Laha, K.
Format: Artikel
Sprache:eng
Schlagworte:
Applied sciences
Austenitic stainless steels
Characterization and Evaluation of Materials
Chemistry and Materials Science
Creep
Creep (materials)
Creep tests
Deflection
Exact sciences and technology
Materials Science
Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology
Metallic Materials
Metals. Metallurgy
Nanotechnology
Nitrogen
Optimization
Optimization techniques
Physical metallurgy
Punches
Rupture
Rupture tests
Structural Materials
Surfaces and Interfaces
Thin Films
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Zusammenfassung:Small punch creep (SPC) studies have been carried out to evaluate the creep properties of 316LN stainless steel (SS) at 923 K (650 °C) at various stress levels. The results have been compared with uniaxial creep rupture data obtained from conventional creep tests. The minimum deflection rate was found to obey Norton power law. SPC rupture life was correlated with uniaxial creep rupture life. The influence of nitrogen content on the creep rupture properties of 316LN SS was investigated in the range of 0.07 to 0.14 wt pct. SPC rupture life increased and the minimum deflection rate decreased with the increase in nitrogen content. The trends were found to be in agreement with the results obtained from uniaxial creep rupture tests. These studies have established that SPC is a fast and reliable technique to screen creep properties of different experimental heats of materials for optimizing the chemical composition for developing creep-resistant materials.
ISSN:1073-5623
1543-1940
DOI:10.1007/s11661-013-2027-x