NDLI: Structural and Mechanical Characterization of Service Exposed 2.25Cr

Content Provider	SpringerLink
Author	Yadav, Hari Krishan Maddi, Lakshmiprasad Ballal, A. R. Peshwe, D. R. Rao, Venkateswara
Copyright Year	2016
Abstract	During long term high temperature service exposure of boiler tubes, the microstructural degradation of the boiler tube material occurs, which causes the reduction in creep resistance. In the present study, 1,93,756 h (22.12 years) service exposed boiler tube (superheater tube) was investigated for microstructure and mechanical properties (hardness, tensile, creep). During service, the tube was operating at temperature of 540 °C and 40 MPa stress level. XRD analysis of internal oxide scale of service exposed tube confirmed the formation of hematite and magnetite, resulting in the localized heating which accelerated the microstructural degradation. Comparative microstructural study with the unexposed material revealed the significant coarsening and spheroidization of carbides during service exposure. The hardness and yield strength of exposed tube material decreased by ~17 and 15 %, respectively due to agglomerations of carbides like M$_{23}$C$_{6}$, M$_{2}$C and M$_{6}$C at grain boundaries and decomposition of pearlite colonies in exposed tube material. Fractographic studies on the tensile sample of exposed material exhibited mixed mode of fracture. Significant decrease in creep life was observed as compared to unexposed material due to coarsening of precipitates and reduction in the dislocation density.
Starting Page	1091
Ending Page	1096
Page Count	6
File Format	PDF
ISSN	09722815
Journal	Transactions of the Indian Institute of Metals
Volume Number	70
Issue Number	4
e-ISSN	09751645
Language	English
Publisher	Springer India
Publisher Date	2016-05-27
Publisher Place	New Delhi
Access Restriction	Subscribed
Subject Keyword	Service exposed Microstructural degradation Oxide scale Reduction in creep resistance Metallic Materials Materials Science Tribology, Corrosion and Coatings
Content Type	Text
Resource Type	Article
Subject	Metals and Alloys

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