Abstract
Based on the composition of CZ1 alloy and CZ2 alloy, guide tubes were fabricated. The performance of CZ1 and CZ2 alloy guide tube was studied. Through microscopic observation, it can be seen that the CZ alloy guide tube has a completely recrystallized structure with fine grains and dispersed second phase particles. Autoclave Corrosion test shows that the corrosion resistance of CZ1 and CZ2 alloy in pure water at 360°C is better than recrystallized Zr-4 alloy and Zr-1Sn-1Nb alloy tubes, and the corrosion resistance of CZ1 alloy in steam at 400°C is similar to recrystallized Zr-4 alloy and better than CZ2 and recrystallized Zr-1Sn-1Nb alloy. The mechanical test shows that the yield strength and tensile strength of CZ alloy are equal to or slightly higher than recrystallized Zr-4 alloy and Zr-1Sn-1Nb alloy at room temperature and elevated temperature. The out-pile axial creep tests show that the creep deformation of various alloys are very small for low stress (60MPa) conditions, and the axial creep resistance of CZ alloy is better than that of recrystallized Zr-4 alloy and inferior to recrystallized Zr-1Sn-1Nb alloy for high stress (> 100MPa) conditions. According to the comprehensive evaluation of the out-pile test results, CZ alloy guide tube has excellent out-pile performance, and CZ alloys have the prospect of being used as guide tube material.
