退火处理对钛合金压印接头疲劳性能影响

发布时间：2018-04-01 08:17

本文选题：钛合金　切入点：压印连接　出处：《焊接学报》2017年08期

【摘要】：文中实现了钛合金板材的压印连接,并将得到的压印接头分成两部分,一部分不予处理,一部分进行整体退火处理.将得到的两组试件进行静拉伸试验和拉-拉疲劳试验.结果表明,未处理的钛合金压印接头静拉伸最大载荷均值为4 363.64 N,失效位移均值为1.48 mm.退火处理后,钛合金压印试件的静拉伸最大载荷均值为3 879.74 N,失效位移均值为1.85 mm;未处理的钛合金压印接头疲劳性能明显优于后者,前者的疲劳极限高于后者约68%;两种接头的疲劳裂纹总是在压印点偏上的部位出现,SEM分析显示该部位应力较为集中且存在多个疲劳源,两种断口的疲劳源呈脆性疲劳断裂特征,退火处理的接头颈部断裂断口为塑性断裂.
[Abstract]:In this paper, the imprint connection of titanium alloy sheet is realized, and the imprint joint is divided into two parts, some of which are not treated. The static tensile test and tensile fatigue test of the two groups of specimens are carried out. The results show that, The mean value of the maximum static tensile load and the failure displacement of untreated titanium alloy imprint joint are 4 363.64 N and 1.48 mm respectively. The maximum static tensile load of titanium alloy imprint specimen is 3 879.74 N and the average failure displacement is 1.85 mm. The fatigue performance of untreated titanium alloy imprint joint is obviously superior to that of the latter. The fatigue limit of the former is higher than that of the latter about 68, and the fatigue cracks of the two kinds of joints always appear in the upper part of the embossing point. The SEM analysis shows that the stress is concentrated and there are many fatigue sources in this part, and the fatigue sources of the two fracture surfaces are brittle fatigue fracture characteristics. The neck fracture fracture of the joint treated by annealing is plastic fracture.
【作者单位】：昆明理工大学机电工程学院;
【基金】：国家自然科学基金资助项目(51565023) 云南省教育厅科学研究基金重大专项项目(ZD201504)
【分类号】：TG166.5;TG386.3

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