缺口取向及温度对第三代单晶高温合金DD33热疲劳行为的影响  

Effect of Notch Orientation and Temperature on Thermal Fatigue Behavior of a Third-Generation Single Crystal Superalloy DD33

作　　者：郑明瑞 李亚微 刘静[1,2] 王莉[1] 郑伟[1] 董加胜[1] 张健[1] 楼琅洪[1] ZHENG Mingrui;LI Yawei;LIU Jing;WANG Li;ZHENG Wei;DONG Jiasheng;ZHANG Jian;LOU Langhong(Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China;School of Materials Science and Engineering,University of Science and Technology of China,Shenyang 110016,China)

机构地区：[1]中国科学院金属研究所,沈阳110016 [2]中国科学技术大学材料科学与工程学院,沈阳110016

出　　处：《材料研究学报》2024年第2期111-120,共10页Chinese Journal of Materials Research

基　　金：航空发动机及燃气轮机基础科学中心项目(P2021-AB-IV-001-002);国家科技重大专项(2017-VI-0019-0091)。

摘　　要：使用OM、SEM和EDS等手段,研究了第三代镍基单晶高温合金DD33不同V型缺口取向([100]、[210]和[110])片状试样从室温到不同上限温度(1000℃、1100℃和1200℃)的热疲劳过程中裂纹的萌生和扩展行为。结果表明,在三种上限温度,DD33合金的热疲劳性能均出现明显的各向异性。在三个上限温度[100]取向试样均表现出最好的热疲劳性能;上限温度为1000℃和1200℃[110]取向试样的热疲劳性能最差,上限温度为1100℃[210]取向试样的热疲劳性能最差。不同取向试样的热疲劳裂纹的萌生和扩展行为,均呈现出一定的晶体学取向规律。热应力、氧化以及滑移系的开动,导致不同取向试样裂纹的扩展速率不同。The crack initiation and propagation behavior of a third-generation single crystal superalloy DD33 with V-notches of different orientations([100],[210]and[110])during thermal fatigue tests:samples were hold at different high-temperatures(1000℃,1100℃ and 1200℃ respectively)for 60 s and then quick quenching into water as one cycle,was investigated by OM,SEM and EDS.The results show that the thermal fatigue properties of DD33 show obvious anisotropy tested at different high-temperatures.The initiation and propagation behavior of thermal fatigue cracks in samples with different notch orientations show the dependence of crystallographic orientation.At 1000℃/1100℃/1200℃,the[100]orientated specimens exhibit the best thermal fatigue performance.The thermal fatigue performance of the[210]oriented sample is the worst at 1100℃,while the thermal fatigue performance of the[110]oriented sample is the worst at 1000℃ and 1200℃.The thermal stress,oxidation,and the operation of slip systems result in the difference in crack growth rate of samples with different notch orientations.

关 键 词：金属材料 单晶高温合金 缺口取向 热疲劳 各向异性 氧化 

分 类 号：TG132.32[一般工业技术—材料科学与工程]