In this study, the effect of microstructure on dwell-fatigue response for Ti-6Al-4V alloy was studied. Tensile tests and fatigue tests with varying dwell periods and maximum stresses were performed on samples having varying fractions of primary alpha (α_p). Yield and ultimate tensile strength increased with a reduction in the α_p, whereas elongation is highest for the samples with smallest effective grain size. Lowest and highest fatigue/dwell-fatigue lives were obtained for the samples with 74 and 53 % α_p, respectively, with the latter showing lowest dwell debit. Detailed microstructural characterization revealed that alloying element partitioning and colony-sizes were responsible for varying properties.

在这项研究中，研究了微观结构对 Ti-6Al-4V 合金的驻留疲劳响应的影响。_{对具有不同比例的初级 alpha (α p} )的样品进行了具有不同停留时间和最大应力的拉伸测试和疲劳测试。屈服强度和极限抗拉强度随着 α _{p 的}降低而增加，而有效晶粒尺寸最小的样品的伸长率最高。_{α p}为 74 % 和 53 % 的样本分别获得了最低和最高的疲劳/驻留疲劳寿命，后者表现出最低的驻留疲劳。详细的微观结构表征表明，合金元素分配和菌落大小是造成不同性能的原因。