轧制工艺对Zr-4合金带材织构取向及腐蚀性能的影响

Effect of Rolling Technology on Texture Orientation and Corrosion Performance of Zr-4 Zirconium Alloy Strips

采用800和960℃两种温度条件将Zr-4合金进行热轧开坯至2.2mm厚度,经中间退火后用带材轧机冷轧加工至1.2mm,再经过中间退火后冷轧成0.6mm厚的带材,研究轧制工艺对Zr-4合金带材织构取向因子的影响,并测试不同开坯温度制备的相同厚度的冷轧带材在400℃、10.3MPa过热蒸汽中72h的腐蚀性能。结果表明,相同冷轧加工率条件下,960℃热轧开坯所制备带材横向织构总是大于800℃热轧开坯所制备带材,而其法向织构总是小于800℃热轧开坯所制备的带材;相同热轧开坯温度条件下,冷轧加工率越大,横向织构越小,法向织构越大;经800℃热轧开坯制备的0.6mm厚的Zr-4合金带材的蒸汽腐蚀性能优于经960℃热轧开坯制备的Zr-4合金带材。讨论认为,可以在经济、稳定的工艺条件下相对精确地控制和计算Zr-4合金带的横向织构取向因子,但应关注工艺实施对成品带材腐蚀性能的影响。

Zr-4 alloy was hot rolled to 2.2 mm thickness at 800 and 960 ℃ respectively, then cold rolled to 1.2 mm by a strip roller after interannealing, and finally cold rolled to 0.6 mm strips by the strip roller again after interannealing. The effect of rolling technology on the texture orientation factor of Zr-4 alloy strips was discussed, and the corrosion performance was tested in super-heated steam at 400 ℃, 10.3 MPa for 72 h for the same-thickness rolled strips prepared at different cogging temperatures. Results show that in the same cold rolling deformation, transverse texture of the strip hot rolled at 960 ℃ is always more than that of the strip hot rolled at 800 ℃, while the normal texture of the strip rolled at 960 ℃ is always less than that of the strip hot rolled at 800 ℃. After hot rolling, the more cold rolling deformation causes less transverse texture but more normal texture. Corrosion performance in stream of 0.6 mm Zr-4 alloy strip rolled at 800 ℃ is better than that of the strip rolled at 960 ℃. Therefore, it is possible to control and calculate the texture orientation factor of the Zr-4 alloy strips while attention should be paid to the effect of rolling technology on corrosion performance.