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首页> 外文会议>Eighth International Fatigue Congress Vol.5, Jun 3-7, 2002, Stockholm, Sweden >THE INFLUENCE OF WATER ENVIRONMENT ON FATIGUE CRACK GROWTH BEHAVIOUR IN TITANIUM ALUMINIDES AND HYDROGEN EVOLUTION BEHAVIOUR
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THE INFLUENCE OF WATER ENVIRONMENT ON FATIGUE CRACK GROWTH BEHAVIOUR IN TITANIUM ALUMINIDES AND HYDROGEN EVOLUTION BEHAVIOUR

机译：水环境对铝钛合金疲劳裂纹扩展行为及氢逸出行为的影响

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The influence of environment on fatigue crack growth behaviour was investigated both in nearly lamellar and in duplex titanium aluminides, and the hydrogen evolution kinetics was analyzed by thermal desorption spectroscopy. The tensile strength of the duplex material decreases in the order of the extent of the water molecule content in the environment: the strength in vacuum is the highest, and decreases in the order of laboratory air and finally in water. When cathodic charging is applied, the fatigue crack growth rate becomes higher than in dry air, particularly in the higher stress intensity factor range. The hydrogen evolution rate is increased by cathodic charging, with lower temperature peaks and higher ones. The peaks at lower temperatures are correlated with the decomposition of hydrides and de-trapping of hydrogen from microstructural imperfections such as microvoids. As-received materials also show an evolution peak at a higher temperature, and the evolution rate is almost independent of cathodic charging. In addition, the evolution rate at a high temperature (above 800℃) is increased by cathodic charging. The hydrogen is considered to have an important role on fatigue crack growth acceleration.
机译：研究了环境对几乎层状和双相铝化钛中疲劳裂纹扩展行为的影响，并通过热解吸光谱分析了析氢动力学。双相材料的抗拉强度按环境中水分子含量的顺序降低：真空中的强度最高，而实验室空气中则降低，最后在水中。当施加阴极充电时，疲劳裂纹的生长速率变得比干燥空气中的高，特别是在较高的应力强度因子范围内。通过阴极充电可提高氢气的释放速率，并具有较低的温度峰和较高的温度峰。较低温度下的峰与氢化物的分解和氢从微结构缺陷（如微孔）中的脱氢有关。接收到的材料在较高的温度下也显示出析出峰，析出速率几乎与阴极带电无关。另外，通过高温带电可以提高高温（800℃以上）的析出速度。氢被认为对加速疲劳裂纹的成长具有重要作用。

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