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通过研究在相同加工率的条件下,不同热轧温度对锆合金第二相粒子的影响,来选择最优的加工工艺。实验采用NZ2锆合金,参照NZ2合金工业规模铸锭板材的加工工艺参数,选取热轧温度分别为800、700、650、610℃制得厚1.4mm的板材样品,进行400℃,10.3MPa过热蒸气腐蚀,在不同时间取样测其氢含量。通过金相,扫描电镜及透射电镜观察合金中第二相的分布、种类。结果表明,选择合适的热轧温度可以得到均匀、细小,弥散分布的第二相,进而制备出具有更高耐腐蚀性能且吸氢量较少的锆合金。
Through the study of the same processing rate conditions, different hot rolling temperature on the second phase particles of zirconium alloy to choose the best processing technology. The NZ2 zirconium alloy was used in the experiment. According to the processing parameters of the industrial scale ingot plate of NZ2 alloy, the plate samples with the thickness of 1.4mm and the hot rolling temperatures of 800, 700, 650 and 610 ℃ were selected respectively and the superheated steam at 400 ℃ and 10.3MPa Corrosion, sampling at different times to measure its hydrogen content. The distribution and type of the second phase in the alloy were observed by metallography, scanning electron microscopy and transmission electron microscopy. The results show that the second stage of uniform, fine and dispersed distribution can be obtained by selecting suitable hot rolling temperature, and then zirconium alloy with higher corrosion resistance and less hydrogen absorption capacity can be obtained.