Research on Preparation Method for Zr-4 Tubes with Different Hydride Orientation

Zr-4 tubes with 140±20 ppm(1 ppm=1 μg/g) and 260±20 ppm hydrogen were prepared by using electrolysis hydrogenating method, and these tubes were further undergone the effect of hydride stress reorientation through loading high pressure gas. Finally, Zr-4 tubes with different hydride orientation were received. The results showed that tubes with 140±20 ppm and 260±20 ppm hydrogen can be obtained via electrolysis with 105 mA/cm²×2 h and 110 mA/cm²×(4 h+50 min) respectively. When the temperature cycle is 400-200℃ and actual heating and cooling speeds are about 10℃/min and 0.75℃/min respectively, and tubes with the hydride orientation up to 0.7 can be obtained by just one thermal cycle through adjusting the pressure and the holding time.