Pt丝型芯撑对DD5单晶高温合金组织和性能的影响  

Effect of Core Support Made of Pt on the Microstructure and Property of DD5 Single Crystal Superalloy

作　　者：南晓斌 袁晓飞 吴剑涛 郭小童 曹晓卿[1] Nan Xiaobin;Yuan Xiaofei;Wu Jiantao;Guo Xiaotong;Cao Xiaoqing(College of Materials Science and Engineering,Taiyuan University of Technology,Taiyuan 030024,China;Gaona Aero Material Co.,Ltd,Beijing 100081,China;Chongqing CEPREI Industrial Technology Research Institute Co.,Ltd,Chongqing 401332,China;China Electronic Product Reliability and Environmental Testing Research Institute,Guangzhou 511370,China)

机构地区：[1]太原理工大学材料科学与工程学院,山西太原030024 [2]北京钢研高纳科技股份有限公司,北京100081 [3]重庆赛宝工业技术研究院有限公司,重庆401332 [4]中国电子产品可靠性与环境试验研究所,广东广州511370

出　　处：《稀有金属材料与工程》2023年第3期1007-1014,共8页Rare Metal Materials and Engineering

基　　金：中国钢研科技集团有限公司核心技术产品攻关工程项目(重20GN0001GG)。

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。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 DD5 alloy 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,870℃as well as stress rupture property at 1093℃/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.

关 键 词：PT 型芯撑 DD5合金 显微组织 力学性能 

分 类 号：TG146.15[一般工业技术—材料科学与工程]