Author
R.N. Singh
Other affiliations: Homi Bhabha National Institute, Malmö University
Bio: R.N. Singh is an academic researcher from Bhabha Atomic Research Centre. The author has contributed to research in topics: Fracture toughness & Hydride. The author has an hindex of 11, co-authored 51 publications receiving 331 citations. Previous affiliations of R.N. Singh include Homi Bhabha National Institute & Malmö University.
Papers published on a yearly basis
Papers
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TL;DR: In this paper, the threshold stress, σth, for reorientation of hydrides in cold worked and stress-relieved (CWSR) Zr 2.5Nb pressure tube material was determined in the temperature range of 523-673 K.
44 citations
15 Jun 2004-Materials Science and Engineering A-structural Materials Properties Microstructure and Processing
TL;DR: In this article, the delayed hydride cracking (DHC) velocity was measured for Zr-2.5Nb alloy pressure tubes manufactured from cold-worked and stress-relieved (CWSR) route and quenched and aged (Q&A) route at 162, 203, and 250
Abstract: The delayed hydride cracking (DHC) velocity was measured for Zr–2.5Nb alloy pressure tubes manufactured from cold-worked and stress-relieved (CWSR) route and quenched and aged (Q&A) route at 162, 203, and 250 °C. It was observed that the DHC velocity in the pressure tubes produced from Q&A route is about half to one-third of that observed in the tubes produced from CWSR route. The lower DHC velocity in Q&A tubes compared to that in the CWSR tubes have been rationalized in terms of the difference in strength and effective hydrogen diffusivity compared to the tubes manufactured from CWSR route. A modification to Dutton–Puls model of DHC is suggested by proposing alternate expression for the elastic stress-field ahead of a sharp crack for an elasto-plastic material.
34 citations
TL;DR: In this paper, the fracture toughness of unirradiated, cold worked and stress relieved (CWSR) Zr-2.5Nb pressure tube alloys used in Indian Pressurized Heavy Water Reactor is reported.
31 citations
TL;DR: In this article, a curved Compact Tension specimens of 17"mm width containing 100 wppm of hydrogen were made using electro discharge machining, and they were subjected to gaseous hydrogen charging and stress reorientation treatment to form radial hydrides.
24 citations
TL;DR: In this paper, the authors measured Young's modulus and hardness for metal matrix of Zircaloy-4 cladding and δ-hydride embedded within its matrix using nanoindentation for the temperature range of 300 k −773 k.
20 citations
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TL;DR: In this article, the authors review the processes of hydrogen transport, hydride precipitation and dissolution and formation of mesoscale hydrides, and highlight where more research is needed, both from an experimental and from a modeling point of view.
161 citations
01 Jan 2012
TL;DR: In this article, the twin processes of uniform oxidation and hydrogen embrittlement are described comprehensively in terms of their underlying mechanisms, and the emphasis of this chapter is on uniform oxidisation.
Abstract: When zirconium alloys are used in water-cooled reactors, they are subjected to waterside corrosion. The emphasis of this chapter is on uniform oxidation and hydrogen embrittlement. The twin processes of oxidation and hydriding are described comprehensively in terms of their underlying mechanisms.
153 citations
TL;DR: In this paper, the microstructure-dependent and temperature-dependent degradation model considering both hydrogen and oxidation was elaborated based on a substantial number of tests made so far and well-known thermodynamic and kinetic parameters.
105 citations
TL;DR: In this paper, the effect of reoriented hydrides on the tensile properties of the Zr-2.5 wt% Nb pressure tube alloy was evaluated in the temperature range of 298-573 K.
98 citations
TL;DR: In this article, the terminal solid solubility (TSS) of hydrogen for Zr-alloy pressure tube materials was determined corresponding to end of hydride dissolution (TSSD) and start of hydrogen precipitation (TSSP) using the dilatometry technique.
74 citations