Creep/fatigue accelerated failures of K403 superalloy turbine blades are inspected, and the damage behaviors are revealed and failure modes are determined in laboratory. It is concluded that: (1) significant discrepancies of fractographies and cross-sectional microstructures are interpreted by qualitative and quantitative investigations; (2) the observed morphologies are mainly attributed to the dendrite separation and γ' phase rafting behaviors, together with the development of ‘void migration mechanism’, i.e., grain interior → grain boundary → sub grain boundary; (3) the failure of turbine blade changes from the mixed to the intergranular mode, which is essentially controlled by the contribution proportion of creep damage and fatigue damage.

对K403高温合金涡轮叶片蠕变/疲劳加速失效进行了检测，揭示了损伤行为，并在实验室确定了失效模式。得出的结论是：（1）通过定性和定量研究来解释断面和横截面微观结构的显着差异；(2) 观察到的形貌主要归因于枝晶分离和γ'相漂流行为，以及“空隙迁移机制”的发展，即晶内→晶界→亚晶界；(3) 涡轮叶片的失效由混合模式转变为晶间模式，本质上受蠕变损伤和疲劳损伤的贡献比例控制。