【摘要】 以DD5二代单晶高温合金为研究对象，通过在单晶薄板中插入Pt丝型芯撑模拟研究型芯撑对于涡轮叶片基体组织和成分偏析的影响，同时测试插入Pt丝型芯撑后DD5合金薄板的典型性能，明确型芯撑对于合金性能的影响规律。结果表明：Pt丝型芯撑与DD5合金基体熔接效果好，无明显异质界面，Pt丝完全合金化，其组织与DD5合金基体组织一致，未形成新相。Pt丝型芯撑的插入对于DD5合金基体组织的影响不大，但导致合金元素偏析程度升高。此外，Pt丝型芯撑的插入对DD5合金薄板的室温拉伸、870℃拉伸及1093℃/158MPa持久性能未产生明显负面影响，合金的断裂模式为枝晶间开裂，裂纹沿碎裂的碳化物及碳化物与基体界面处萌生并扩展。更多还原

【Abstract】 Taking the second generation of DD5 single crystal turbine blades as the research object, the effect of core support on the microstructure and element segregation of turbine blades were simulated by inserting Pt wire core braces into single crystal turbine plates. In addition, the typical properties of DD5 thin-wall plate specimens with core support made of Pt were tested to clarify the influence of core support on alloy propertie s. The results show that core support made of Pt has great bonding with DD5alloy without obvious heterogeneous interface. The core support made of Pt is completely alloyed, the microstructure of core support is consistent with DD5 alloy, and no new phase is observed. Core support made of Pt had no influence on the microstructure of DD5 alloy, but the degree of element segregation of DD5 alloy increases. Moreover, core support made of Pt has no negative effect on the tensile property at room temperature, 8 70 °C as well as stress rupture property at 1093 °C/158 MPa of DD5 thin-wall plate specimens. The fracture mode of DD5 thin-wall plate specimens with core support is interdendritic rupture,and cracks initiate and propagate along the interface between carbide and matrix.更多还原