Ti-22Al-25Nb合金双板条组织的高温疲劳性能  

High temperature fatigue properties of Ti-22Al-25Nb alloydouble slats

作　　者：孙玉鑫 马雄 梁晓波[2,3] 韩潮雨 史晓强[2,3] 赵洪泽 SUN Yuxin;MA Xiong;LIANG Xiaobo;HAN Chaoyu;SHI Xiaoqiang;ZHAO Hongze(Institute for Advanced Studies in Precision Materials,Yantai University,Yantai 264005,Shandong,China;Beijing CISRI-Gaona Materials and Technology Co.,Ltd.,Beijing 100081,China;Central Iron and Steel Research Institute,Beijing 100081,China)

机构地区：[1]烟台大学精准材料高等研究院,山东烟台264005 [2]北京钢研高纳科技股份有限公司,北京100081 [3]钢铁研究总院有限公司,北京100081

出　　处：《金属功能材料》2024年第5期39-45,共7页Metallic Functional Materials

基　　金：国家科技重大专项经费资助(2017-VI-0004-0074)。

摘　　要：研究了Ti-22Al-25Nb合金双板条组织在300、500和700℃下的轴向高周疲劳行为,并对疲劳试样的断口与组织形貌进行了表征。结果发现:3种温度下Ti-22Al-25Nb合金双板条组织的条件疲劳极限分别为510、338和356 MPa。300℃试样的裂纹既有表面形核也有内部形核,500和700℃试样的裂纹均起源于试样表面。300℃的疲劳条纹呈现脆性条带特征,500℃呈现间断与连续的过渡条纹,而700℃则表现为塑性条纹。细小针状O相板条区域容易产生裂纹,而粗大片状板条在裂纹扩展路径上起到阻碍作用,有利于提高材料的疲劳寿命。The axial high-cycle fatigue behavior of Ti-22Al-25Nb alloy multi-scale double slats at 300,500and 700℃was studied,and the fracture and structure morphology of fatigue samples were characterized.The results showed that the fatigue limits were 510,338and 356MPa,respectively.The cracks of 300℃samples have both surface and internal nucleation,and the cracks of 500and 700℃samples originated from the surface of the samples.The fatigue striations at 300℃show the characteristics of brittle bands,the intermittent and continuous transition striations at 500℃,and the plastic striations at 700℃.Small acicular O-phase slats are prone to crack,while large sheet slats hinder the crack propagation path,which is conducive to improving the fatigue life of the material.

关 键 词：TI-22AL-25NB合金 双板条组织 高周疲劳 断口形貌 

分 类 号：V215[航空宇航科学与技术—航空宇航推进理论与工程] V415[一般工业技术—材料科学与工程] TG146.23[金属学及工艺—金属材料]