Abstract—Recycling of Zr-Nb-Sn-Fe scraps in casting
enhances the price competitiveness of nuclear-grade Zr alloys
and accordingly the energy from nuclear power plants.
Increasing the fraction of scrap in casting of new alloy ingots
increases the price competitiveness, but it aggravates the
deformability and mechanical reliability of cast alloys. In this
study, the effect of scrap ratio on the mechanical reliability of
Zr-Nb-Sn-Fe alloys was studied. The increase of scrap fraction
in casting increases the oxygen content in the ingot and nuclear
claddings fabricated from cast ingots. The increase of oxygen
content is caused by the surface oxide of scraps such as small
pieces of turning, chips, etc. Iron content was not found to
increase appreciably with the increasing fraction of scrap
because scraps were well kept in the iron-free container. The
microstructure of ss-cast Zr alloy with increasing fraction of
scraps displayed plate/or needle α phase and the
microstructural features were observed to be affected by
increase of scrap fraction. The strength increases with
increasing fraction of scrap, which can be attributed to the
increase of oxygen content. The ductility decreased slightly with
increase of scrap fraction. The strength increased at the expense
of ductility with increase of scrap fraction. In some ingots, iron
oxide flakes were intentionally added to explore the effects of
iron oxide which may be added from the scarp storage
container. The alloys with the addition of iron oxide flakes
exhibited the drastic decrease of the formability and exhibited
the brittle fracture behavior during rolling. The increase of
oxide fraction increased the oxidation resistance because of high
oxygen content the matrix may have prevented oxygen diffusion
Index Terms—Zr-Nb-Sn-Fe, scrap, recycling, nuclear energy, oxygen, ductility.
Jae Sook Song is with Nano Engineering Research Cener, Chungnam National University, Daejon 34134, South Korea (e-mail: firstname.lastname@example.org).
Sun Ig Hong is with Materials Science and Engineering Department, Chungnam National University, Daejon 34134, South Korea (e-mail: email@example.com).
Cite: Jae Sook Song and Sun Ig Hong, "Recycling Zr-Nb-Sn-Fe Scrap in Casting of Nuclear-Grade Alloy Ingots and Its Effects on Mechanical Performance and Integrity," International Journal of Environmental Science and Development vol. 11, no. 2, pp. 84-88, 2020.Copyright © 2020 by the authors. This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).