Hydrogen as a temporary alloying element for the formation of specific microstructural gradients in the (alpha+beta) titanium alloy Ti-6Al-4V

氢作为临时合金元素,用于在(αβ)钛合金 Ti-6Al-4V 中形成特定的微观结构梯度

基本信息

项目摘要

Engineering components are subject to increasing demands with respect to durability and reliability. Simultaneously, their design, production and application should fulfil sustainable, ecological and economic demands. In order to meet these requirements, the development of thermochemical or thermomechanical processes is necessary. Because of the comparatively high gas solubility of titanium alloys, a temporary hydrogen charging as part of a so-called thermo-hydrogen treatment (THT) is possible. Since hydrogen causes elastic or (via hydride formation) plastic lattice deformation and is known to be a strong β-stabilizing element, the establishment of a modified microstructure is possible improving the mechanical properties as compared to conventionally generated microstructures of titanium alloys. Moreover, THT is applicable to complex geometries which cannot be surface-treated via conventional mechanical surface treatment processes. This study aims at a microstructural adjustment via a purposeful local change of the β grain size and the distribution and morphology of strengthening precipitates as a function of the distance to surface (microstructural gradient) causing in particular an improvement of the material’s fatigue properties.In order to be able to design the THT process, data on the phase stabilities, the hydrogen diffusion coefficient and the hydrogen solubility in dependence of the initial microstructure needs to be known. Based on this data, the THT process steps will be designed by means of simulation calculations and checked and adjusted by means of systematic experimental investigations. Subsequently, the improvement of the mechanical properties under monotonic and cyclic loading will be evaluated experimentally. In the final stage of the research project, the transferability of the best of the developed THT processes to complex geometries will be documented using a sample part, which represents a real component.Previous studies on the application of THT to establish a hitherto gradient-free microstructure show that a purposeful adjustment of the THT parameters should allow for an establishment of microstructure gradients, which cause an improvement of the fatigue resistance. In this juncture, two concepts seem to be promising, namely the establishment of a temporary hydrogen concentration gradient and the formation of a hydride precipitation zone. These two concepts shall be investigated in the research project planned.
工程部件对耐久性和可靠性的要求越来越高。同时,其设计、生产和应用应满足可持续的、生态的和经济的需求。为了满足这些要求,发展热化学或热机械工艺是必要的。由于钛合金具有较高的气体溶解度,作为所谓的热氢处理(THT)的一部分,临时充氢是可能的。由于氢引起弹性或(通过氢化物形成)塑性晶格变形,并且被认为是一种强烈的β稳定元素,与传统的钛合金组织相比,建立一种改进的微观组织是可能改善其力学性能的。此外,THT还适用于无法通过常规机械表面处理工艺进行表面处理的复杂几何形状。本研究旨在通过有目的地局部改变β的颗粒尺寸和强化相的分布和形态作为到表面的距离(显微组织梯度)的函数来调整组织,从而特别是改善材料的疲劳性能。为了能够设计THT工艺,需要知道关于相稳定性、氢扩散系数和氢的溶解度与初始组织的关系的数据。在此基础上,通过模拟计算对THT工艺步骤进行了设计,并通过系统的实验研究对其进行了校核和调整。随后,将对单调和循环加载下的力学性能的改善进行实验评估。在研究项目的最后阶段,将使用代表真实成分的样本部分来记录最好的THT工艺对复杂几何形状的可转移性。先前关于THT应用于建立迄今无梯度的微观结构的研究表明,有目的地调整THT参数应该允许建立微观结构梯度,从而提高疲劳抗力。在这一关头,有两个概念似乎是有希望的,即建立临时氢浓度梯度和形成氢化物沉淀区。这两个概念应在计划的研究项目中进行调查。

项目成果

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Professor Dr.-Ing. Hans Jürgen Christ其他文献

Professor Dr.-Ing. Hans Jürgen Christ的其他文献

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{{ truncateString('Professor Dr.-Ing. Hans Jürgen Christ', 18)}}的其他基金

Application of microLaue diffraction using a 3D energy-dispersive detector to study the evolution of fatigue damage in polycrystalline structural materialsy
使用 3D 能量色散探测器应用 microLaue 衍射研究多晶结构材料疲劳损伤的演变
  • 批准号:
    332602495
  • 财政年份:
    2016
  • 资助金额:
    --
  • 项目类别:
    Research Grants
Investigation of the Ni-effect in Co-Re-Cr high temperature alloys
Co-Re-Cr高温合金中Ni效应的研究
  • 批准号:
    273571371
  • 财政年份:
    2015
  • 资助金额:
    --
  • 项目类别:
    Research Grants
Fatigue life reduction of steels in pressurized hydrogen as a consequence of changes in short crack propagation mechanisms
由于短裂纹扩展机制的变化,钢在加压氢气中的疲劳寿命缩短
  • 批准号:
    251753485
  • 财政年份:
    2014
  • 资助金额:
    --
  • 项目类别:
    Research Grants
Entwicklung eines Lebensdauervorhersagekonzepts im VHCF-Bereich auf der Basis kovariater mikrostruktureller Merkmalsgrößen
基于协变量微观结构特征尺寸的 VHCF 领域寿命预测概念的开发
  • 批准号:
    239363299
  • 财政年份:
    2013
  • 资助金额:
    --
  • 项目类别:
    Priority Programmes
Fundamental characterization of novel Mo-Si-B-Ti-alloys at ultra-high temperatures
超高温下新型Mo-Si-B-Ti合金的基本表征
  • 批准号:
    236295902
  • 财政年份:
    2013
  • 资助金额:
    --
  • 项目类别:
    Research Grants
Charakterisierung und Simulation der VHCF-Schädigungsentwicklung auf Basis des Resonanzverhaltens am Beispiel eines metastabilen Austenitstahls
以亚稳态奥氏体钢为例,基于共振行为对 VHCF 损伤发展进行表征和模拟
  • 批准号:
    172654300
  • 财政年份:
    2010
  • 资助金额:
    --
  • 项目类别:
    Priority Programmes
Koordinierungsaufgaben im Schwerpunktprogramm SPP 1466 Life - Unendliche Lebensdauer für zyklisch beanspruchte Hochleistungswerkstoffe
优先计划 SPP 1466 Life 中的协调任务 - 循环应力高性能材料的无限使用寿命
  • 批准号:
    171632927
  • 财政年份:
    2010
  • 资助金额:
    --
  • 项目类别:
    Priority Programmes
Veränderung der Eigenschaften thermisch wachsender Chromoxiddeckschichten auf Hochtemperaturlegierungen durch den Einfluss von Wasserdampf/Wasserstoff
由于水蒸气/氢气的影响,高温合金上热生长氧化铬顶层的性能发生变化
  • 批准号:
    164210718
  • 财政年份:
    2010
  • 资助金额:
    --
  • 项目类别:
    Research Grants
Experimentelle und modellmäßige Bewertung der dreidimensionalen Auswirkung mikrostruktureller Barrieren während der Rissinitiierungphase VHCF-beanspruchter Werkstoffe
VHCF 应力材料裂纹萌生阶段微观结构障碍三维影响的实验和建模评估
  • 批准号:
    172277823
  • 财政年份:
    2010
  • 资助金额:
    --
  • 项目类别:
    Priority Programmes
Einfluss des Versetzungsgleitverhaltens und der Vorgeschichteabhängigkeit auf das Ermüdungsverhalten im VHCF-Bereich
位错滑移行为和历史依赖性对 VHCF 区域疲劳行为的影响
  • 批准号:
    139079637
  • 财政年份:
    2009
  • 资助金额:
    --
  • 项目类别:
    Research Grants

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EAGER:注入适体的石墨烯晶体管纹身作为临时汗液生物传感平台
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Impact of the expiration of temporary pandemic SNAP benefits on the healthfulness of supermarket food purchases
临时大流行 SNAP 福利到期对超市食品采购健康性的影响
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RUI:表征化合价、临时和非化合价阴离子:计算方法和光分离光谱
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Being forever stuck in the asylum queue or progressing with temporary protection: is South America approaching the end of asylum?
永远被困在庇护队列中还是在临时保护下取得进展:南美的庇护即将结束吗?
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Novel and Environmental-friendly Method for Temporary Underground Hydrogen Storage on the Earth, Moon, and Mars by Utilizing Nanobubbles
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Temporary Pacing Safety Monitor - Digital Platform
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Evaluating the long-term impact of Release on Temporary License (ROTL)
评估临时许可证发布 (ROTL) 的长期影响
  • 批准号:
    ES/X011879/1
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    2023
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Safer Havens: Ethnographic action research to unpack social adversity and resilience in newly arrived temporarily housed asylum seeking children and families in Quebec and Ontario
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  • 批准号:
    488473
  • 财政年份:
    2023
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    --
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    Operating Grants
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