Creep Resistance of New Zirconium Alloy With 0.3%Nb
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摘要: 通过对低铌新锆合金板材的蠕变性能曲线和变形亚结构的分析及对微观组织研究探讨了低铌新锆合金的蠕变过程及其抗蠕变性能优越的原因。铌对锆有较高的强化作用,但对锆的抗蠕变性能的影响则较为复杂。含3%～5%Nb的锆合金在400℃以下有较高的抗蠕变性能,含15%Nb的锆合金的抗蠕变性最低,而铌含量增至30%时的锆合金的抗蠕变性则又升高。低Nb新锆合金的Nb含量w(Nb)在0.3%～0.36%之间,这样少的Nb含量不可能有大量的βNb相产生,它对锆合金的强化作用应归于固溶强化一类。对工业化规模生产的低铌新锆板材的力学性能的近期研究表明,按既定工艺生产的低铌新锆合金板材的拉伸性能并未比Zr4合金板材的拉伸性能有多大提高,但其抗蠕变性能却比Zr4板材好得多。在400℃、157MPa应力作用下,低铌新锆合金的蠕变断裂时间是常规Zr4板材的5倍多;在137和117MPa应力作用下,新锆合金的稳态蠕变速率大大低于常规Zr4的。Abstract: The creep resistance was investigated by means of study on the creep curve and deformation microstructure for new zirconium alloy. It is known that Nb has good strengthening action on zirconium alloy, and also has complex effect on creep resistance of zirconium alloy. The zirconium alloy containing 3%～5%Nb has better creep resis- tance below 400 ℃, but lest while containing 15%Nb. When Nb adds to 30%, the creep resistance of zirconium alloys begins to rise. Recently, the mechanical properties of new zirconium alloy plates containing 0.3%Nb were studied. The results show that the tensile properties of new zirconium alloy plate in industry processing does not obviously increase, compared with Zr-4 plate. But its creep resistance is much better than that of Zr-4 plate. For example, under 400 ℃ and 157 MPa stress, the creep fracture time of new zirconium alloy is 5 times more than that of Zr-4 alloy, and under 137 and 117 MPa stress, the creep ratio of new zirconium alloy is less than that of Zr-4 alloy greatly.
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Keywords:
- new zirconium alloy ,
- creep properties ,
- microstructure
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