Journal of Siberian Federal University. Engineering & Technologies / Study on Long-Term Tempering on the Microstructure of Creep Strength Enhanced Ferritic P92 Steel

Full text (.pdf)
Issue
Journal of Siberian Federal University. Engineering & Technologies. 2022 15 (4)
Authors
Vinay Kumar Pal; L. P. Singh
Contact information
Vinay Kumar Pal: Sam Higginbottom University of Agriculture, Technology and Sciences Allahabad, India; gaurishankar.vinaypal@gmail.com; L. P. Singh: Sam Higginbottom University of Agriculture, Technology and Sciences Allahabad, India; vinaymd002@gmail.com
Keywords
empering time; creep strength enhanced ferritic steel; grain; recipitates; M23C6; particles; microstructure; M23C6
Abstract

Present paper deal with the studies of effect of long term heating on the microstructure and mechanical properties of creep strength enhanced Cr-Mo P92 steel. Such steels are used in supercritical power plant boilers where continuous operating temperature and pressure can be as high as 650 0C and 300 bar respectively. The P92 specimens were thermally exposed at temperature of 650 0C for duration of varying from 1000 to 3000 hours. Tensile fracture and impact toughness fracture surfaces were studied by using scanning electron microscope. The fracture surface of P92 impact toughness specimen exhibited both inter lath-decohesion and ductile dimple tearing. The various phases that formed in the tempered P92 steel were analyzed by X‑ray diffraction. In XRD analysis of tempered P92 it was observed that amount of precipitates increased as compared to untempered condition. After tempering time of 1440 h, some new precipitates such as NbC, NbCrN were also observed

Pages
459–471
DOI
10.17516/1999-494X-0407
Paper at repository of SibFU
https://elib.sfu-kras.ru/handle/2311/148447

Creative Commons License This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License (CC BY-NC 4.0).

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