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Effect of alloy content on microstructure and microchemistry of phases during short term thermal exposure of 9Cr–W–Ta–0.1C reduced activation ferritic/martensitic (RAFM) steels
Ravikirana R Mythili S Raju S Saroja G Paneerselvam T Jayakumar E Rajendra Kumar
Volume 37 Issue 6 October 2014 pp 1453-1460
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https://www.ias.ac.in/article/fulltext/boms/037/06/1453-1460 -
Keywords
Reduced activation ferritic/martensitic steels ;tempering kinetics ;microstructure ;microchemistry. -
Abstract
This paper presents the results of an experimental study on the microstructural evolution in 9Cr reduced activation ferritic/martensitic steels during short term thermal exposures. Since the microstructure is strongly influenced by the alloying additions, mainly W, Ta and C contents, the effect of varying W and Ta contents on the martensite structure that forms during normalizing treatment and the subsequent changes during tempering of the martensite in the temperature regime of 923–1033 K have been studied. Microstructural changes like subgrain formation and nature of precipitates have been evaluated and correlated to hardness variations. The systematic change in size distribution and microchemistry of M23C6 carbide is studied with variation in W content at different temperatures.
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Author Affiliations
Ravikirana1 2 R Mythili1 S Raju1 S Saroja1 G Paneerselvam3 T Jayakumar1 E Rajendra Kumar4
- Metallurgy and Materials Group, Indira Gandhi Centre for Atomic Research, Kalpakkam 603 102, India
- Indira Gandhi Centre for Atomic Research, Homi Bhabha National Institute, Kalpakkam 603 102, India
- Chemistry Group, Indira Gandhi Centre for Atomic Research, Kalpakkam 603 102, India
- TBM Division, Institute for Plasma Research, Gandhinagar 382 428, India
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Dates
- Published
- October 2014
- Manuscript received
- 3 June 2013
- Manuscript revised
- 3 September 2013
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