充氢条件对金属中氢的程序升温脱附的影响
Influence of charging conditions on simulated temperature-programmed desorption for hydrogen in metals
摘要：
氢脆失效是金属的主要问题，因此需要更好地理解金属内的损伤微观机制和氢扩散。局部浓度取决于包括捕获效应在内的迁移现象，通常通过程序升温解吸方法（通常称为热解吸分析）来表征。当氢从试样中释放出来，在程序化加热过程中，观察到一些解吸峰，通常与通过分析程序的脱陷能量有关。这种方法的局限性在这里重新审视和气态氢充电在高温下进行了模拟。由于氢气在高温下的溶解度较高，这种流行的方法能够获得高浓度。然而，氢进入陷阱的偏析行为取决于充电时间和温度。这个过程和随后的冷却改变氢分布的数值模拟，它被发现，TDA光谱强烈影响的充电温度和充电时间，无论是弱和强的陷阱。然而，在室温下冷却后和解吸前的老化时间的影响是唯一明显的弱陷阱。
英文摘要：
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.
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