Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 639, Issue -, Pages 431-438Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2015.05.062
Keywords
P92 steel; Normalizing; Tempering; Stress rupture; Microstructural evolution
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Funding
- Board of Research in Nuclear Sciences (BRNS)
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P92 steel is used in normalized and tempered condition for optimal creep properties. Effect of varying tempering temperatures in the range of 740-780 degrees C on the stress rupture properties has been investigated in this study. High dislocation density and fine laths resulted in high rate of microstructural evolution in 740 degrees C tempering case, hence the steep slope of rupture curve was observed as compared to higher tempering temperatures. Quantification of lath width and precipitate size under Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) revealed increase in lath width and precipitate coarsening with tempering temperature and exposure time. Increase in lath width was more pronounced in 740 degrees C tempering case. The results were supported by the damage parameter (lambda) and hardness measurements. Variation in fractographic features was associated more with rupture time, for a particular tempering temperature. Coarser precipitates were responsible for cavity initiation, inducing some brittle fracture at higher rupture times. (C) 2015 Elsevier B.V. All rights reserved.
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