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首页> 外文会议>World Conference on Titanium v.3; 20030713-20030718; Hamburg; DE >Hydrogen Effects on the Mechanical Properties of Beta Titanium Alloys
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Hydrogen Effects on the Mechanical Properties of Beta Titanium Alloys

机译：氢对β钛合金力学性能的影响

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摘要

In order to understand the effect of hydrogen on the mechanical properties and the corresponding microstructure, the two beta titanium alloys Alloy C and Timetal~R21S were studied. The specimens were heat treated in an annealing apparatus which is connected to a gas supply system. Various concentrations of hydrogen were achieved by means of hydrogen charging from helium/hydrogen gas mixtures either during solution annealing or ageing. The effect of hydrogen on the mechanical behaviour were investigated, by means of tensile tests, low-cyclic fatigue tests under total strain control and Charpy impact tests at various temperatures. The experiments were carried out for different contents of hydrogen (up to 6 at.% of hydrogen). In order to understand the basic mechanisms scanning electron microscopy, transmission electron microscopy and X-ray diffraction were applied and the results were correlated with the respective mechanical behaviour. The two alloys investigated clearly showed fundamental differences in the effect of hydrogen on the mechanical behaviour. Hydrogen changes the microstructure in Timetal~R21S resulting in a high increase in ductility in combination with a loss of strength, while in Alloy C hydrogen affects the mechanical properties without directly influencing the microstructure. Obviously, an extrinsic effect prevails in Timetal~R21S, while in the case of Alloy C a strong intrinsic influence exists.
机译：为了了解氢对机械性能和相应显微组织的影响，研究了两种β钛合金C和Timetal〜R21S。在连接到气体供应系统的退火设备中对样品进行热处理。在溶液退火或时效过程中，通过从氦气/氢气混合物中充入氢气获得了各种浓度的氢气。通过拉伸试验，总应变控制下的低周疲劳试验以及在不同温度下的夏比冲击试验，研究了氢对机械性能的影响。针对不同的氢含量（高达6 at。％的氢）进行了实验。为了了解扫描电子显微镜，透射电子显微镜和X射线衍射的基本机理，并将结果与​​各自的机械性能相关联。研究的两种合金清楚地表明了氢对机械性能影响的根本差异。氢会改变Timetal〜R21S的微观结构，从而导致延展性大大提高，同时强度也会降低；而合金C中的氢会影响机械性能，而不会直接影响微观结构。显然，在Timetal〜R21S中存在外在效应，而在合金C的情况下，则存在强大的内在影响。

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