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首页> 外文OA文献 >Generation of Microstructural Gradients for Improved Mechanical Properties via Thermo-Hydrogen Treatment of the Metastable Beta Titanium Alloys Beta CTM and Ti 10V-2Fe-3Al
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Generation of Microstructural Gradients for Improved Mechanical Properties via Thermo-Hydrogen Treatment of the Metastable Beta Titanium Alloys Beta CTM and Ti 10V-2Fe-3Al

机译：通过热氢处理改善机械性能的微观结构梯度的产生亚稳β钛合金βCTM和Ti 10V-2Fe-3Al的热氢处理

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Structural components must be lightweight and produced resource-saving while still fulfil the increasing durability and reliability requirements. One approach to fulfil these requests is a temporary hydrogen charging of Ti-alloys, which generates lattice distortion and hydrides. The volume difference between hydride precipitates and the alloy matrix results in localized plastic deformation. This triggers recrystallization and enables a finer microstructure as attainable by a conventional heat treatment. The study aims at an elaboration of a thermo-hydrogen treatment that establishes a change in grain size and/or an alteration in distribution and morphology of strengthening secondary α precipitates as a function of the distance to surface (microstructural gradient). The gradient is based on a gradient of the hydride volume fraction. Generally, THT design requires kinetic (temperature dependency of the hydrogen diffusion coefficient DH) in addition to thermodynamic (H/β-Ti-alloy interaction) data, which has been obtained for Ti 3Al-8V-6Cr-4Mo-4Zr and Ti 10V-2Fe-3Al. Subsequent to a solution treatment the variation of hydrogenation time and temperature is operated to establish comparably slight microstructural gradients on these materials. For further investigations it is concluded that materials with less alloying elements ((α+β)-Ti-alloys (e.g.,Ti 6Al-4V)) than these β-Ti-alloys can satisfy the requirements to generate steeper microstructural gradients even better.
机译：结构部件必须重量轻，生产资源节约，而仍然符合耐用性和可靠性要求的增加。满足这些请求的一种方法是Ti合金的临时氢气充电，其产生晶格变形和氢化物。氢化物沉淀物之间的体积差异和合金基质导致局部塑性变形。该触发器重结晶并使得可以通过传统热​​处理可实现的更精细的微观结构。该研究旨在阐述热氢处理，其建立晶粒尺寸的变化和/或改变强化次级α沉淀物的分布和形貌，作为到表面距离（微观结构梯度）的函数。梯度基于氢化物体积分数的梯度。通常，除了热力学（H /β-Ti合金相互作用）数据之外，THT设计还需要动力学（氢气扩散系数DH的温度依赖性），其已经获得Ti 3Al-8V-6CR-4MO-4ZR和TI 10V -2fe-3al。在解决方案处理之后，操作氢化时间和温度的变化以在这些材料上建立相对轻微的微观结构梯度。为了进一步调查，得出结论的是，具有较少合金化元素的材料（（α+β）-ti-合金（例如，Ti 6Al-4V））可以满足甚至更好地产生陡峭的微观结构梯度的要求。

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