钛合金压印接头疲劳性能与微观分析

发布时间：2018-06-10 15:00

本文选题：钛合金 + 压印连接　；参考：《材料导报》2017年06期

【摘要】：压印连接是近年来新兴的连接方式,因其具有简单高效、低耗环保等优点,在连接应用方面越来越受到重视,而疲劳破坏是机械零件失效的主要形式。对钛合金压印接头的疲劳性能进行了实验研究,与母材的力学性能进行了对比分析,并对疲劳失效断口进行了断口分析和能谱分析。实验结果显示钛合金压印接头的平均拉伸-剪切强度约为同等尺寸材料拉伸-剪切强度的36.7%;钛合金压印接头的疲劳极限约为材料疲劳极限的46%,平均载荷约为接头最大静强度的42%。微观特征显示断口呈脆性疲劳断裂特征,由于微动磨损和氧化作用产生了成分为氧化钛的微动磨屑,且其硬度较高,因此在微动过程中起到磨粒的作用,从而加速了磨损和裂纹扩展,最终导致疲劳失效。
[Abstract]:Imprint connection is a new type of connection in recent years. Because of its advantages of simple and high efficiency, low consumption and environmental protection, more and more attention has been paid to the connection application, and fatigue failure is the main form of failure of mechanical parts. The fatigue properties of titanium alloy imprinted joints were studied experimentally, and the mechanical properties of the joints were compared with those of the base metal. The fracture surface of the fatigue failure fracture was analyzed and the energy spectrum was analyzed. The experimental results show that the average tensile shear strength of titanium alloy imprint joint is about 36.7 of the tensile shear strength of the same size material, the fatigue limit of titanium alloy embossing joint is about 46 of the material fatigue limit, and the average load is about 42 of the maximum static strength of the joint. The microcosmic characteristics show that the fracture surface is brittle fatigue fracture. Because of the fretting wear and oxidation, the fretting debris of titanium oxide is produced, and its hardness is relatively high, so it plays the role of abrasive particles in the fretting process. Thus, the wear and crack propagation are accelerated, and fatigue failure is finally caused.
【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(51565023) 云南省教育厅科学研究基金重大专项(ZD201504) 昆明理工大学分析测试基金(20130576)
【分类号】：TG306

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