孙洋洋,常辉,方志刚,王莹,董月成,郭艳华,周廉.TC4 ELI钛合金显微组织对低周疲劳性能的影响[J].稀有金属材料与工程,2020,49(5):1623~1628.[Sun Yangyang,Chang Hui,Fang Zhigang,Wang Ying,Dong Yuecheng,Guo Yanhua,Zhou Lian.Effect of Microstructure on Low Cycle Fatigue Properties of TC4 ELI Titanium Alloy[J].Rare Metal Materials and Engineering,2020,49(5):1623~1628.]
TC4 ELI钛合金显微组织对低周疲劳性能的影响
投稿时间:2019-01-29  修订日期:2019-04-06
中文关键词:  钛合金  显微组织  低周疲劳  断口形貌
基金项目:海洋装备用金属材料及其应用国家重点实验室开放基金(项目号SKLMEA-K201807);中国博士后科学基金(项目号2017M623392);江苏省研究生科研与实践创新计划项目(KYCX17_0984);江苏高校优势学科建设工程资助项目(PAPD)
中文摘要:
      本文通过分析TC4 ELI合金在不同应力幅下的应变-循环次数曲线,研究了双态和片层两种典型组织的低周疲劳性能。组织观察发现:双态组织中等轴α相体积分数约26.6%,等轴α相平均晶粒尺寸~7.8 μm。片层组织试样中,α相的片层厚度为0.5 ~ 2.0 μm。低周疲劳性能结果表明:在最大应力水平下,不同组织的TC4 ELI合金均表现出显著的循环软化现象,双态组织具有更加优异的疲劳性能,这主要是因为双态组织中有效的滑移程远小于片层组织,此外高位错密度等轴α相的存在也阻碍了疲劳裂纹的萌生和扩展。扫描断口形貌分析发现:双态组织试样的疲劳断口平整光滑,而片层组织断口则出现了与原始粗大的β晶粒有关的几何形刻面。
Effect of Microstructure on Low Cycle Fatigue Properties of TC4 ELI Titanium Alloy
英文关键词:titanium alloy  microstructure  low cycle fatigue  fracture morphology
英文摘要:
      Low cycle fatigue behavior of TC4 ELI titanium alloy with bimodal and lamellar microstructure had been investigated by analyzation of strain-cycles curve with different stress amplitudes. Results indicated that the volume fraction of equiaxed α phase is about ~ 26.6% for the bimodal microstructure, the average grain size is approximate 7.8 μm. At the same time, the thickness of α phase layer is about 0.5 ~ 2.0 μm for lamellar microstructure. Cyclic softening phenomenon was observed for all the samples of TC4 ELI alloys with different microstructure at the maximum stress. Sample with bimodal microstructure exhibited higher low cycle fatigue life, which could be attributed to the shorter effective slip path than the one with lamellar microstructure. More than that, the presence of equiaxed α-phase with high dislocation density also could hinder the initiation and propagation of fatigue cracks for the bimodal microstructure. Fracture morphology shown flat and smooth for the sample with bimodal microstructure, however, some geometric facets associated with the original coarse-grained β were found for the sample with lamellar microstructure.
作者单位E-mail
孙洋洋 南京工业大学 syy359658288@163.com 
常辉 南京工业大学 ch2006@njtech.edu.cn 
方志刚 海军研究院 zhigangfang@263.net 
王莹 海洋装备用金属材料及其应用国家重点实验室 wangying2205b@163.com 
董月成 南京工业大学
海军研究院 
dongyuecheng@njtech.edu.cn 
郭艳华 南京工业大学 guoyanhua@njtech.edu.cn 
周廉 南京工业大学 zhoul@c-nin.com 
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