Structural and phase changes under electropulse treatment of fatigue-loaded titanium alloy VT1-0
Structural and phase changes under electropulse treatment of fatigue-loaded titanium alloy VT1-0
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DOI：
10.1016/j.jmrt.2018.09.008
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发表时间：
2019-01-01
影响因子：
6.4
通讯作者：
Kosinov, Dmitry
中科院分区：
文献类型：
--
作者：
Konovalov, Sergey;Komissarova, Irina;Kosinov, Dmitry
研究了电脉冲处理(EPT)对VT1-0钛合金疲劳寿命、组织和相组成的影响。研究表明，EPT可使疲劳寿命提高1.3倍。用透射电子显微镜分析了EPT和耐久试验后样品的结构和物相组成的变化。在涉及悬臂弯曲的疲劳试验过程中，工业纯钛表面形成了一种晶粒和亚晶组织。研究表明，该材料的表面层具有多相结构。纳米晶颗粒是由α-钛形成的。发现了钛的氧化物相，它位于α-钛的晶界上。在最上层的纳米结构层中只观察到了氧化物相颗粒。在样品的其余部分中，没有这一相的颗粒。EPT引起氧化相颗粒尺寸的变化和表层微晶尺寸的倍增。由于这种处理，材料表层的内应力集中较少，因此减少了可能的裂纹起始点。(C)2018年巴西冶金、材料和采矿协会。书名/作者Elsevier Editora Ltd.这是一篇CC BY-NC-ND许可证下的开放获取文章。
The effect of electropulse treatment (EPT) of titanium alloy VT1-0 on the change of its fatigue life, structure and phase composition has been investigated. The study has shown that EPT improves the fatigue life by 1.3 times. Methods of TEM were used to analyze changes of the structure and phase composition of samples subjected to EPT and endurance testing. In the process of fatigue tests involving cantilever bending, a grain and sub-grain structure is formed in the surface of commercially pure titanium. The study has disclosed that the surface layer of the material has a multi-phase structure. Nano-crystal grains are formed by alpha-titanium. Oxide phase of titanium has been revealed, which is located along the crystallite boundaries of alpha-titanium. Particles of oxide phase have been identified exclusively in the top nano-structured layer. In the rest of the sample there are no particles of this phase. EPT causes dimensional changes of oxide phase particles and many-fold dimensional changes of crystallites in the surface layer. Owing to this treatment there are less internal stress concentrators in the surface layer of the material, which results, therefore, in cut down on probable spots of crack origination. (C) 2018 Brazilian Metallurgical, Materials and Mining Association. Published by Elsevier Editora Ltda. This is an open access article under the CC BY-NC-ND license.