Nuclear Engineering and Technology

Korean Nuclear Society (한국원자력학회)
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X-Ray Diffraction line profile analysis of defects and precipitates in high displacement damage neutron-irradiated austenitic stainless steels

  • Shreevalli M. (Homi Bhabha National Institute, Training School Complex, Anushakti Nagar) ;
  • Ran Vijay Kumar (Homi Bhabha National Institute, Training School Complex, Anushakti Nagar) ;
  • Divakar R. (Homi Bhabha National Institute, Training School Complex, Anushakti Nagar) ;
  • Ashish K. (Post Irradiation Examination Division, Metallurgy and Materials Group, Indira Gandhi Centre for Atomic Research) ;
  • Padmaprabu C. (Homi Bhabha National Institute, Training School Complex, Anushakti Nagar) ;
  • Karthik V. (Homi Bhabha National Institute, Training School Complex, Anushakti Nagar) ;
  • Archna Sagdeo (Homi Bhabha National Institute, Training School Complex, Anushakti Nagar)
  • Received : 2023.06.09
  • Accepted : 2023.09.11
  • Published : 2024.01.25
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Abstract

Irradiation-induced defects and the precipitates in the wrapper material of the Indian Fast Breeder Test Reactor (FBTR), SS 316 are analyzed using the synchrotron source-based Angle Dispersive X-Ray Diffraction (ADXRD) technique with X-rays of energy 17.185 keV (wavelength ~0.72146 Å). The differences and similarities in the high displacement damage samples as a function of dpa (displacement per atom) and dpa rate in the range of 2.9 × 10-7- 9 × 10-7 dpa/s are studied. Ferrite and M23C6 are commonly observed in the present set of high displacement damage 40-74 dpa SS 316 samples irradiated at temperatures in the range of 400-483 ℃. Also, the dislocation density has increased as a function of the irradiation dose. The X-ray diffraction peak profile parameters quantified such as peak shift and asymmetry show that the irradiation-induced defects are sensitive to the dpa rate-irradiation temperature combinations. The increase in yield strength as a function of displacement damage is also correlated to the dislocation density.

Keywords

Acknowledgement

The authors acknowledge Dr. B. Venkatraman, Director IGCAR, for the constant support and encouragement during the course of this work. Mr. Shaji Kurien, Head, PIED and Mr. C.N. Venkiteswaran, Former Head, SMFCS are gratefully acknowledged for their support in all the stages of the project. Authors gratefully acknowledge Dr. Tapas Ganguly, Head, Synchrotron Utilization Division and Dr. A.K Sinha, Former Head, Synchrotron Utilization Division for permitting to carry out investigations at the synchrotron facility. Advice and assistance in safe handling of specimen from the Radiological Safety Officers, Dr. Haridas, RRCAT and Mrs. Akila, Radio Metallurgy Laboratory, IGCAR during the course of examinations are gratefully acknowledged. Experimental support provided by RRCAT colleagues Mr. Manveer Singh and Mr. Abhay Bhisikar at Beam Line-12 is thankfully acknowledged. Support from Mr. Priyag during the experimental campaign is thankfully acknowledged. Also, SM acknowledges DAE, India for the HBNI fellowship.

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