(西安交通大学 金属材料强度国家重点实验室， 西安 710049)
摘 要: 研究了渗氢前后国产Zr-4合金板轧制平面内不同取向的基本力学性能及其断裂性质。结果表明：渗氢前后国产Zr-4合金板均为面内各向同性、厚向各向异性的材料，氢化物的出现对其各向异性行为无显著影响，仅稍微提高了材料的强度，如弹性模量、屈服强度及断裂强度等，但却大大降低了材料的延性；氢化物对材料延性的影响主要集中在材料的非均匀变形阶段；采用圆盘状的单位胞有限元模型可以较好地预测渗氢后Zr-4合金的力学性能。
关键字: Zr-4合金；氢化物；力学性能；有限元模型
on mechanical behavior of zircaloy-4
sheets and FEM simulation
（State Key Laboratory for Mechanical Behavior of Materials,
Xi′an Jiaotong University, Xi′an 710049, China）
Abstract:The mechanical behavior of zircaloy-4 sheets， before and after hydridizat ion, was studied with three orientations (L, LT，T) in their planes, as well as fracture characteristics. It is shown that nonhydrided and hydrided zircaloy-4 sheets have isotropic properties in their plane and anisotropic properties in throughthickness direction. There is no significant effect of hydride on plate's anisotropy for mechanical properties. However, the hydride precipitation can lightly strengthen the material, such as modulus of elasticity, yielding stress, fracture strength, and greatly reduce the ductility. The deleterious effect of hydride precipitation on ductility of zircaloy-4 sheets occurs mainly at the unstable deformation stage. The mechanical behaviors of hydrided zircaloy-4 sheets ca n be predicted well by the circle plate unit cell model.
Key words: zircaloy-4 sheet; hydride; mechanical behavior; FEM model
