退火工艺对锆合金成形性能的影响（英文）

研究退火工艺(ATs)对Zr-Sn-Nb合金带材显微组织的影响。基于核燃料组件用条带特征，进行冲制实验，并定量表征锆合金带材的成形性能。结果表明，580℃退火(AT I)样品、620℃退火样品(AT II)和原材的小角度晶界占比分别为14.3%、23.2%和12.4%。AT I带材的成形极限裕度为0.43%，而原材和AT II带材的成形裕度分别仅为-0.35%和-2.8%。退火工艺影响带材再结晶织构的演化过程和改变晶粒尺寸。由于织构总量和极密度变化与带材各向异性程度密切相关，小角度晶界影响带材冲制过程中颈缩单元的应变路径与裂纹扩展，而晶粒尺寸影响带材硬化指数。

Effects of annealing treatments on forming performance of zirconium alloys

The effects of annealing treatments (ATs) on the microstructure of Zr?Sn?Nb alloy strips were studied. Based on the characteristics of strips for nuclear fuel assemblies, punching experiments were carried out and the formability of zirconium alloy strips was quantitatively evaluated. The results indicate that the proportions of small-angle grain boundaries of the zirconium alloy under conditions of annealing treatment at 580 °C (AT I) and annealing treatment at 620 °C (AT II) are 14.3% and 23.2%, respectively, while that of the as-received material is 12.4%. And the forming limit margin fields of the zirconium alloy under AT I can reach 0.43%, while the values of the as-received material and the AT II are ?0.35% and ?2.8%, respectively. The annealing process affects the evolution process of the strip recrystallization texture and the grain size. Moreover, the total texture and pole density are closely related to the degree of anisotropy of the strip. Besides, the small-angle grain boundary affects the strain path and crack expansion of the necking unit during the strip punching process, while the grain size affects the hardening exponent of the material.