中文摘要：

以固溶加时效处理后的GH4098合金板材为研究对象,测定其在不同温度（800~1000℃）、不同应力（90~680MPa）条件下的短时持久性能（持久断裂时间10 min~3 h）,并对其显微组织和断裂特征进行表征。结果表明：GH4098合金在800~1000℃范围内持久断裂模式均为沿晶塑性断裂。随着温度的升高,GH4098合金短时持久性能逐渐降低,但在1000℃持久性能退化程度明显加剧。组织表征结果表明：GH4098合金晶粒尺寸并未随着温度的升高而变化,而高温下合金中γ’相体积分数的降低以及γ’相和晶界碳化物的粗化是合金短时持久性能显著退化的主要原因。同时,对冷却速度对合金显微组织的影响以及短时蠕变与传统蠕变的异同也进行了讨论。

英文摘要：

Short time stress rupture properties（10 min-3 h） of GH4098 alloy have been investigated at different temperatures（800-1000 °C） and stresses（90~680 MPa） after solution and aging treatment, combined with the characterization of microstructures and fracture features. The results show that fracture features of GH4098 alloy are ductile and intergranular in all temperature range. Short time stress rupture properties of the alloy degrade gradually with increasing the testing temperature, but they are significantly worse at 1000 °C. Microstructural characterization indicates that there is little change in grain size with increasing the temperature. The deterioration of short time stress rupture properties at higher temperature is ascribed to the reduction of γ＇ volume fraction as well as the coarsening of γ＇ precipitates and grain boundary carbides. In addition, the influence of cooling rate on microstructures as well as the differences between short time creep and traditional creep was also discussed.