(重庆大学 材料科学与工程学院, 重庆 400030)
摘 要: 采用径向应变控制法，在MTS880/810试验机上用d13mm×1.5mm的单相α-Ti合金管材，在(350±1)℃下进行了5个不同应变量的高温低周疲劳(HTLCF)实验； 记录了各自的循环应力—应变滞后环， 得出了试样的循环响应特征和各试样的高温低周疲劳寿命。对实验数据按Coffin-Manson公式拟合出疲劳曲线方程，从而绘出了该试材的Δεt—2Nf倍寿命关系曲线。考虑到低周疲劳数据的离散性， 对其中的Δεt=1.0%和Δεt=1.5%两个应变量的各6个试验数据按双参数Weibull分布进行了统计分析。
关键字: 钛合金；管材； 高温低周疲劳
temperature low cycle fatigue
（College of Material Science and Engineering,
Chongqing University, Chongqing 400030）
Abstract:The high temperature low cycle fatigue (HTLCF) of d13mm×1.5mm single phase α-Ti alloy pipe materials was tested with five different strain parameters at (350±1)℃ on the test equipment of MTS 880/810, by the method of radial strain control. The individual cycle—strain hysteresis loops were recorded, and the cycling response and high temperature low cycle fatigue life were obtained.The experimental data were treated as fatigue curve formula according to Coffin-Manson formula, then the fatigue life curve Δεt—2Nf of tested materials was drawn. In consideration of the scatter of low cycle fatigue data, statistical analysis was applied to the six experimental data of two strain parameters Δεt=1.0% and Δεt=1.5% based on dual parameters Weibull distribution.
Key words: titanium alloy; pipe specimens; high temperature low cycle f
