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通过分析优化,确定了 Zr-Sn-Nb 系两种先进锆合金。研究了新锆合金的加工工艺、显微组织及腐蚀性能间的关系。通过在高压釜360 ℃、含 LiOH 的高温水以及在 500 ℃过热蒸气中的实验,评价了热处理和化学成分对腐蚀性能的影响。结果表明,两种新锆合金(N18,N36)在含 LiOH 的高温水中的腐蚀性能大大优于 Zr-4 合金,尤其是在 500 ℃过热蒸气中表现出极好的耐疖状腐蚀性能。电子显微镜分析证明含细小和均匀分布β-Nb 和 Zr(Fe,Nb)粒子的试样具有最好的堆外性能。此外,新锆合金的力学性能也优于 Zr-4合金,所有试样的吸氢量与氧化膜厚度成线性关系。
Through the analysis and optimization, two advanced Zr-Sn-Nb alloys were determined. The relationship between processing technology, microstructure and corrosion properties of the new zirconium alloy was studied. The effects of heat treatment and chemical composition on corrosion performance were evaluated by experiments in an autoclave at 360 ° C, high temperature water containing LiOH, and superheated steam at 500 ° C. The results show that the corrosion performance of two new zirconium alloys (N18, N36) in LiOH-containing high temperature water is much better than that of Zr-4 alloy, especially in 500 ℃ superheated steam. Electron microscopy analysis demonstrated that samples containing fine and uniformly distributed β-Nb and Zr (Fe, Nb) particles had the best off-nite properties. In addition, the mechanical properties of the new zirconium alloy is also superior to the Zr-4 alloy, the amount of hydrogen absorption of all samples linearly related to the thickness of the oxide film.