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本文研究了等静液挤压的Zr-2.5％Nb合金的机械性能、热稳定性、腐蚀性能、蠕变性能以及等静液挤压工艺参数—壁厚减缩率与直径减缩率的比值Q与氢化物取向的关系。采用了金相、x光和电镜等技术。实验结果指出:等静液挤压的Zr-2.5％Nb合金300℃的机械性能σ_b=60～63公斤/毫米~2,σ_(0.2)=50～52.5公斤/毫米~2,δ=16～19％,达到了国外同类合金热处理型的机械性能,并比冷加工的拉伸强度约高19％。合金的蠕变性能亦比较优异。其原因认为是由等静液冷挤后材料的相组成和均匀分布的亚晶胞结构所决定的。等静液挤压管和轧管、拉拔一样,可以通过控制工艺参数Q值,来获得氢化物大部分呈周向分布的织构。初步研究结果表明:用等静液挤压法加工Zr-2.5％Nb合金能改善其性能,用等静液挤压法生产锆合金是很有前途的。
In this paper, the mechanical properties, thermal stability, corrosion resistance, creep properties and isostatic extrusion process parameters of the isostatic extrusion of Zr-2.5% Nb alloy - ratio of wall thickness reduction rate and diameter reduction rate Q Hydride Orientation Relationships. Using the metallographic, x-ray and electron microscopy and other technologies. The experimental results show that the mechanical properties of isobaric liquid extruded Zr-2.5% Nb alloy at 300 ℃ σ_b = 60-63 kg / mm 2, σ 0.2 = 50-52.5 kg / mm 2, 19%, reached the foreign similar alloy heat treatment type mechanical properties, and tensile strength than cold processing about 19% higher. Alloy creep performance is also relatively good. The reason for this is that it is determined by the phase composition of cold isotropic cold squeeze material and the uniform distribution of subcell structure. Isostatic extrusion tube and rolling tube, drawing, you can control the process parameters Q value, to obtain most of the hydride distribution of the circumferential distribution of the texture. The preliminary research results show that the processing of Zr-2.5% Nb alloy by isostatic extrusion can improve its performance. It is very promising to produce zirconium alloy by isostatic extrusion.