低铌新锆合金的抗蠕变性能

Creep Resistance of a New Zirconium Alloy with 0.3 Nb

通过对低铌新锆合金板材的蠕变性能数据和变形亚结构的分析,探讨了低铌新锆合金的蠕变 过程及其抗蠕变性能。结果表明,①工业规模生产的1.4 mm厚的Zr-1Sn-0.3Nb-0.3Fe-0.1Cr合金 板,在400℃,3种应力(117 MPa,137 MPa,157 MPa)条件下,200 h的蠕变,第2阶段的时间-应变关 系分别为:117 MPa时,ε=0.24676+0.0189t(R=99.9%):137 MPa时,ε=1.95822+0.03417t(R=99.8%); 157 MPa时,ε=6.17578+0.15793t(R=98.0%)。②低铌新锆合金的蠕变速率远低于Zr-4合金。