摘要
为了高效地获得能够满足航天航空材料检测领域较高要求的疲劳试样,参考相关标准提出了一种实用高效的TC4钛合金应变疲劳圆棒试样的机加工工艺,并通过表面粗糙度、表面加工痕迹、试样表面状态以及表面残余应力等物理参量对TC4钛合金疲劳试样的表面完整性进行了评价,最后通过液压伺服试验系统进行了应变疲劳试验来表征其疲劳性能。结果表明:使用该机加工工艺所加工的疲劳试样,能够满足航天航空材料检测领域对疲劳试样的较高要求;试样表面的残余压应力在一定程度上增加了TC4钛合金的疲劳性能,同时在大批量制样时可以高效地获得较为稳定、可靠的表面质量,可为实验室有效地控制疲劳试样的加工质量提供参考。
In order to efficiently obtain fatigue specimens that can meet the high requirements in the aerospace material testing field,a practical and efficient machining process for strain fatigue round bar specimen of TC4 titanium alloy was proposed with reference to relevant standards. The surface integrity of the fatigue specimen of TC4 titanium alloy was evaluated by physical parameters such as surface roughness,surface processing marks,surface state and surface residual stress. Finally,the strain fatigue test was carried out by hydraulic servo test system to characterize its fatigue performance.The results show that the fatigue specimens processed by using the machining technology can meet the higher requirements of fatigue specimens in the aerospace material testing field. The residual compressive stress on the specimen surface can increase the fatigue performance of TC4 titanium alloy to some extent. At the same time,it can efficiently obtain stable and reliable surface quality in large-scale specimen preparation. It can provide reference for laboratories to effectively control the processing quality of fatigue specimens.
作者
郑程
李凯
陆慧
ZHENG Cheng, LI Kai, LU Hui(Shanghai Key Laboratory of Engineering Materials Application and Evaluation, Shanghai Research Institute of Materials, Shanghai 200437, China)
出处
《理化检验（物理分册）》
CAS
2018年第8期582-586,共5页
Physical Testing and Chemical Analysis(Part A:Physical Testing)
基金
上海材料研究所技术创新资助项目(165G-14)
