The present study contends with unveiling the damage mechanisms during compressive dwell-fatigue of β-annealed Ti-6242S alloy. The shearing/displacement of lamellar phases, stacking fault nodes formation, and formation of coarse grains (under the lower stress level) are identified as key factors influencing crack initiation and propagation which mainly contribute in fatigue performance deterioration. Such phenomenal evolutions are interconnected with the microstructure evolution, i.e. globularization and grain refinement of lamellar phases, which can be justified considering the dwell time at maximum applied load by providing a proper condition for (i) activation of multiple slip systems, and (ii) dislocation cross-slip, and substructure development.

本研究试图揭示β退火Ti-6242S合金在压缩停留疲劳过程中的损伤机理。层状相的剪切/位移，堆垛层错节点的形成和粗晶粒的形成（在较低的应力水平下）被认为是影响裂纹萌生和扩展的关键因素，主要是导致疲劳性能下降的原因。这种现象的演变与微观结构的演变相互关联，即层状相的球化和晶粒细化，考虑到最大施加载荷下的停留时间，可以通过为（i）激活多个滑移系统提供适当的条件，以及（ii）证明其合理性。错位错滑，子结构发展。