论文标题
充电条件对金属中氢的模拟温度填充的影响
Influence of charging conditions on simulated temperature-programmed desorption for hydrogen in metals
论文作者
论文摘要
归因于氢的失败是金属的主要关注点，因此需要更好地了解金属中的微观机制和氢扩散。局部浓度取决于传输现象，包括捕获效应，通常以温度填充方法为特征，通常称为热解吸分析（TDA）。当在编程加热过程中从样品中释放氢时，观察到一些通过分析程序通常与脱落能量有关的解吸峰。此处重新审视了这种方法的局限性，并模拟了在高温下的气态氢气。由于高温下氢的溶解度较高，因此该流行的程序可以达到高浓度。但是，氢在陷阱中的隔离行为取决于充电时间和温度。此过程和随后的冷却改变氢分布是数值建模的。发现TDA光谱受充电温度和充电时间的强烈影响，无论是弱陷阱还是强大的陷阱。但是，冷却后室温和解吸之前的衰老时间的影响仅对陷阱较弱。
Failures attributed to hydrogen embrittlement are a major concern for metals so a better understanding of damage micro-mechanisms and hydrogen diffusion within the metal is needed. Local concentrations depend on transport phenomena including trapping effects, which are usually characterised by a temperature-programmed desorption method often referred to as Thermal Desorption Analysis (TDA). When the hydrogen is released from the specimen during the programmed heating, some desorption peaks are observed that are commonly related to detrapping energies by means of an analytical procedure. The limitations of this approach are revisited here and gaseous hydrogen charging at high temperatures is simulated. This popular procedure enables attaining high concentrations due to the higher solubility of hydrogen at high temperatures. However, the segregation behaviour of hydrogen into traps depends on charging time and temperature. This process and the subsequent cooling alter hydrogen distribution are numerically modelled; it is found that TDA spectra are strongly affected by the charging temperature and the charging time, both for weak and strong traps. However, the influence of ageing time at room temperature after cooling and before desorption is only appreciable for weak traps.
