Positron annihilation studies on D9 steel – Effect of Ti concentration

Arunkumar, J.; Abhaya, S.; Rajaraman, R.; Amarendra, G.; Nair, K.G.M.; Sundar, C. S.; Raj, Baldev

doi:10.1002/pssc.200982097

Cited by 4 publications

(2 citation statements)

References 7 publications

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“…The initial decrease in positron lifetime and Sparameter upto 700 K can be understood as due to point defect annealing. Similar defect recovery is also seen in austenitic steels subjected to room temperature deformation [9] and proton irradiation [10]. Between 700 and 1000 K, there is a shoulder/broad maximum in the variation of positron annihilation parameters.…”

Section: Methodssupporting

confidence: 53%

Positron annihilation studies on 9Cr reduced activation ferritic/martensitic steels

Ragunanthan

Babu

Chirayath

et al. 2009

Phys. Status Solidi (c)

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Positron annihilation, microstructural and hardness studies were carried out in a 9Cr reduced activation ferrtic ‐ martensitic steel (9%Cr‐1%W‐0.1%C) subjected to isochronal annealing in the temperature range of 300 to 1273 K. The measured lifetime in the ‘as‐received’ (normalized and tempered) condition was 147 ps, which exhibited considerable reduction around 670 K, indicating the annealing out of small vacancy‐defects in the matrix or matrix‐precipitate interfaces. The observed positron lifetime exhibited a broad maximum between 670 K and 1070 K, indicating the existence of second annealing stage. Between 1070 K and 1270 K, a sharp maxium is exhibited in lifetime as third annealing stage. Doppler S‐parameter has also exhibited similar annealing stages. Ab‐intio positron lifetime calculations for various defect‐impurity cluster configurations in ferritic‐matrix based Fe system are reported to understand the experimental results. (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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Section: Methodssupporting

confidence: 53%

Positron annihilation studies on 9Cr reduced activation ferritic/martensitic steels

Ragunanthan

Babu

Chirayath

et al. 2009

Phys. Status Solidi (c)

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“…5. We estimated effective defect migration energy to be 1.13 eV [29]. This is slightly lower as compared to 1.215 eV reported from positron studies in ANSI321 steel with 0.5wt% Ti [17].…”

Section: Swelling Studies Having Established the Usefulness Of Positrmentioning

confidence: 84%

Defect evolution in steels: Insights from positron studies

Rajaraman

Amarendra

Sundar

2009

Phys. Status Solidi (c)

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Positron annihilation studies on austentic and ferritic/martensitic and oxide‐dispersion steels are highlighted so as to emphasize the sensitivity of the technique to defect annealing as well as precipitates. The results obtained on austenitic D9 steels are discussed with a view to emphasize the role of small TiC precipitates in the matrix, which play a critical role in void‐swelling behaviour. Further, the role of Ti/C ratio as well as minor alloying elements on swelling behaviour is discussed. The current focus of research is on the use of nanoclusters in ODS alloys towards the suppression of void formation under irradiation. Recent results on the investigation on nano Yttria particles in Fe – model oxide dispersion ferritic steel, are presented with supporting ab‐initio lifetime calculations. (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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