TB3合金应力时效后低周疲劳行为的研究  

Low Cycle Fatigue Behavior of Stress-Aged TB3 Alloy

作　　者：张临财[1,2] 郭啸栋 孙巧艳[2] 肖林[2] 孙军[2] 宋振亚[2,3] 

机构地区：[1]江苏省介入医疗器械研究重点实验室,江苏淮安223003 [2]西安交通大学金属材料强度国家重点实验室,陕西西安710049 [3]绍兴文理学院,浙江绍兴312000

出　　处：《稀有金属材料与工程》2013年第10期2153-2156,共4页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(51101068);淮阴工学院校级重点基金项目

摘　　要：对固溶处理后的Ti-10Mo-8V-1Fe-3.5Al(TB3)合金施加弹性压应力,同时在500℃下进行时效处理。TEM观察结果表明:在应力时效的样品里大部分晶粒中α片相互平行排列,即只有一种α片变体,而在未施加压应力常规时效的样品中出现了数种α片的变体。选择了两种强度相当的热处理状态的TB3试样进行低周疲劳测试,一种是500℃自由时效9 h,另一种是在约200 MPa压应力下,500℃时效6 h。低周疲劳测试结果表明:在同一应变幅下,应力时效试样具有较高的低周疲劳寿命。After solution treatment,Ti-10Mo-8V-1Fe-3.5Al （TB3） alloy was aged at 500 ℃ under a compressive stress.TEM results show that several α variants are observed in conventionally aged samples.However,in the stress-aged TB3 samples,most α plates are parallel to each other in one β grain,which indicates a variant selection effect.Two kinds of TB3 samples were selected for low cycle fatigue tests,which had been heat treated to the same strength level.The one was conventionally aged at 500 ℃ for 9 h,and the other was aged at 500℃ for 6 h with about 200 MPa compressive stress.Low cycle fatigue （LCF） test results show that the stress-aged TB3 samples exhibit a longer LCF lifetime than the conventionally aged ones.

关 键 词：Β钛合金 应力时效 低周疲劳行为 变体选择效应 

分 类 号：TG166.5[金属学及工艺—热处理]