ZTA15铸造钛合金高周疲劳性能研究  

High-cycle Fatigue Properties of ZTA15 Cast Titanium Alloy

作　　者：张健辉 纪志军 冯新 陈冬梅[4] 杨国娟[5] ZHANG Jian-hui;JI Zhi-jun;FENG Xin;CHEN Dong-mei;YANG Guo-juan(AECC Beijing Institute of Aeronautical Materials,Beijing 100095,China;Baimtec Material Co.,Ltd.,Beijing 100094,China;Beijing Engineering Research Center of Advanced Titanium Alloy Precision Forming Technology,Beijing 100084,China;AVIC Shenyang Aircraft Design&Research Institute,Shenyang 110035,China;AVIC Shenyang Aircraft Company Limited,Shenyang 110034,China)

机构地区：[1]中国航发北京航空材料研究院,北京100095 [2]北京航空材料研究院股份有限公司,北京100094 [3]北京市先进钛合金精密成型工程技术研究中心,北京100084 [4]沈阳飞机设计研究所,沈阳110035 [5]沈阳飞机工业(集团)有限公司,沈阳110034

出　　处：《精密成形工程》2022年第6期28-35,共8页Journal of Netshape Forming Engineering

基　　金：国家重点研发计划(2020YFB2008300)。

摘　　要：目的研究ZTA15铸造钛合金的高周疲劳性能及其疲劳断裂微观机理。方法测试ZTA15铸造钛合金的室温轴向拉伸高周疲劳性能,并对合金的金相组织和断口形貌进行观察与分析。结果随着应力比的提高,ZTA15铸造钛合金的疲劳强度相应提高,疲劳寿命也相应延长。应力比为−1、0.06、0.5时,相应ZTA15铸造钛合金的中值疲劳强度分别为341.5、512.5、643 MPa。疲劳断口形貌显示,疲劳裂纹多萌生于试棒的表面和次表面,裂纹萌生区呈类解理断裂特征。裂纹扩展区可以观察到明显的疲劳辉纹、扩展台阶和二次裂纹等典型特征。结论疲劳失效机理和疲劳性能差异与合金的显微组织有一定的关系。应力比对疲劳性能的影响主要作用于疲劳裂纹的萌生和扩展阶段。This paper aims to study the high-cycle fatigue properties and fatigue fracture mechanism of ZTA15 cast titanium alloy.The axial tensile high-cycle fatigue properties of ZTA15 cast titanium alloy under room temperature are tested,and the metallographic structures and fracture morphologies of the alloy are observed and analyzed.With the increase of stress ratio,the fatigue strength and fatigue life of ZTA15 cast titanium alloy increase.When the stress ratio is−1,0.06 and 0.5 respectively,the median fatigue strength of the corresponding ZTA15 cast titanium alloy is 341.5,512.5,643 MPa respectively.The fatigue fracture morphologies show that most of the fatigue cracks originate on the surface and sub surface of the specimen,and most of the cracks originate in the form of cleavage fracture.Obvious fatigue striations,propagation steps and secondary crack can be observed in the crack propagation.The fatigue failure mechanism and the difference of fatigue properties are related to the microstructure of the alloy.The effect of stress ratio on fatigue performance mainly acts on the initiation and propagation stages of fatigue cracks.

关 键 词：ZTA15铸造钛合金 高周疲劳性能 显微组织 疲劳失效机理 

分 类 号：TG146.23[一般工业技术—材料科学与工程]