钛合金压印接头热处理前后静态失效机理分析

发布时间：2018-03-26 04:38

本文选题：钛合金　切入点：压印连接　出处：《材料导报》2015年16期

【摘要】：对钛合金进行压印连接,将得到的压印接头分成3部分,一部分不予处理,一部分进行整体淬火处理,一部分进行整体退火处理,再将热处理前后的接头进行静态力学实验,并运用扫描电子显微镜对接头拉伸断口进行微观分析。结果表明,未处理的钛合金压印接头静拉伸失效载荷为4567.22N,变形位移为1.19mm;淬火处理的钛合金压印接头载荷和位移值均大幅度降低;退火处理的钛合金压印接头失效载荷降低了10.9%,变形位移比未处理的接头增加了7.6%。3种接头失效模式均为颈部断裂失效,从微观角度分析可知钛合金压印接头断口呈现韧窝形貌和少量解理特征,主要为韧性断裂;钛合金压印接头淬火后断口出现准解理特性和滑移特征,为脆性断裂;钛合金压印接头退火后断口呈现准解理和均匀的韧窝特征,主要为韧脆混合断口。
[Abstract]:The imprint joint of titanium alloy is divided into three parts, one part is not treated, one part is treated by whole quenching, one part is treated by whole annealing, and then the joints before and after heat treatment are subjected to static mechanical experiments. The tensile fracture of the joint was analyzed by scanning electron microscope (SEM). The static tensile failure load of untreated titanium alloy imprint joint is 4567.22N, the deformation displacement is 1.19mm, and the load and displacement value of quenched titanium alloy imprint joint are greatly reduced. The failure load of annealed titanium alloy imprint joint was reduced by 10.9, and the deformation displacement increased 7.6.3 kinds of failure modes of joint, all of which were neck fracture failure. From the microcosmic point of view, the fracture surface of titanium alloy imprint joint presents dimple morphology and a few cleavage characteristics, which is mainly ductile fracture, and the fracture surface of titanium alloy imprint joint appears quasi-cleavage characteristic and slip characteristic after quenching, which is brittle fracture. After annealing, the fracture surface of titanium alloy imprinted joint shows quasi cleavage and uniform dimple characteristics, which are mainly ductile-brittle mixed 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(50965009) 昆明理工大学分析测试基金(20130576)
【分类号】：TG166.5

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