Effect of tempering time on the microstructure and stress rupture properties of P92 steel

P92 steels (9 Cr – 0.5 Mo – 1.8 W) are one of the candidate materials for Ultra Super Critical (USC) power plants. Since normalization of P92 results in the formation of martensitic microstructure, the steel is generally used in the normalized and tempered condition. In the present work, the materia...

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Bibliographic Details
Main Authors: Maddi, Lakshmiprasad, Shivhare, Rishi, Kumar, Vijay, Goel, Manish, Ramesh, Mridula, Ballal, Atul
Format: Conference Proceeding
Language:English
Subjects:
Lath martensite
Microstructure evolution
Piping steel
Precipitate growth
Tempering
Ultra Super Critical (USC) power plants
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Summary:P92 steels (9 Cr – 0.5 Mo – 1.8 W) are one of the candidate materials for Ultra Super Critical (USC) power plants. Since normalization of P92 results in the formation of martensitic microstructure, the steel is generally used in the normalized and tempered condition. In the present work, the material is subjected to normalization at 1060 °C and the effect of tempering time has been studied at constant tempering temperature of 780 °C. Decrease in dislocation density, increase in lath width, and precipitate size are the predominant microstructural changes. Short term (∼500 h) stress rupture tests are conducted at 600 °C temperature and structure – property correlation is attempted.
ISSN:2214-7853
2214-7853
DOI:10.1016/j.matpr.2020.06.125