STRUCTURAL INTEGRITY CHANGES IN THE Zr-Nb ALLOY DURING HYDRIDE PHASE TRANSFORMATION UNDER THE THERMAL SHOCK
نویسندگان
چکیده
Structural changes and properties of zirconium alloy subjected to the thermal shock in the solar furnace were investigated. Specimens were prepared from unirradiated cold-worked RBMK Zr-2.5Nb fuel channel pressure tube material after adding hydrogen to the sections of the tubes up to 150 ppm. Tests were done at temperatures up to 1460 C and heating rates 50-83 C per second. After thermal treatment changes were estimated by optical and electron microscopy as well as tensile and microhardness testing. Treatment in the solar furnace revealed, that the influence of hydrogen under thermal shock conditions results in structural degradation and loss of ductility of an alloy.
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