Zr-Sn-Nb合金焊接接头的应变疲劳特性

Strain Fatigue Property of Zr-Sn-Nb Welding Fittings

摘要:

采用板材试样，研究了Zr-Sn-Nb合金焊接接头在室温和375 ℃温度下的应变疲劳行为并和光滑样品进行了比较。结果表明，焊接试样的疲劳寿命不足光滑试样的一半，无论是在室温还是375 ℃，纵向试样的疲劳性能明显优于横向试样；其循环塑性应变幅与疲劳寿命之间遵循Coffin-Manson关系；焊接接头在不同温度和应变条件系，表现出不同的循环变形特征。观察了焊接样品的形貌，分析了断口特征。

Abstract:

The strain fatigue property of the welding fittings of Zr-Sn-Nb alloy plates was investigated both at room temperature and 375 ℃, and also we compared that with the smoothed samples. The results showed that the fatigue life of welding samples was less than half of that of the smoothed samples. The fatigue property of longitudinal samples was obviously better than that of transverse samples both at room temperature and 375 ℃. The cycle plastic strain range and the fatigue life followed the Coffin-Manson relation. The cycle- deformation property of the welding fittings differed at different temperature and strains. The microstructure and the fatigue crack were also investigated.