显微组织对TC18钛合金应力控制低周疲劳性能的影响  

Effects of Microstructure on Low Cycle Fatigue Property of TC18 Titanium Alloy Under Stress-controlled Condition

作　　者：冯抗屯 沙爱学[2] 王庆如[2] 

机构地区：[1]中航飞机起落架有限责任公司工程技术中心工艺所,陕西汉中723200 [2]北京航空材料研究院,北京100095

出　　处：《材料工程》2009年第5期53-56,共4页Journal of Materials Engineering

摘　　要：研究了片状和网篮两种典型组织对TC18钛合金不同应力振幅下低周疲劳寿命的影响。结果表明:TC18钛合金低周疲劳寿命对显微组织的变化不敏感。在相同的应力振幅下,双态组织和片状组织的疲劳寿命基本相当。TC18钛合金的低周疲劳寿命N取决于加载的应力振幅,σmax与N之间呈对数关系,相关系数达0.99以上。The effect of lamellar and bi-modal microstructures on low cycle fatigue life under different stress swing of TC18 titanium alloy was studied. The results show that fatigue life is not sensitive to the change of microstructure of TC18 titanium alloy. Fatigue lives of bi-modal and lamellar microstructures are very similar under the same stress swing. The low cycle fatigue life N of TC18 titanium alloy is determined by stress swing. The relationship between σmax and N is logarithmic and the correlative coefficient is larger than 0. 99.

关 键 词：钛合金 显微组织 低周疲劳 应力控制 

分 类 号：TG113.25[金属学及工艺—物理冶金]