微观视域下钢内氢的温度激发扩散模型及影响因素

Activation and diffusion model of hydrogen in steel under microcosmic condition and its influencing factors

建立了氢陷阱随机分布的二维有限元分析模型,以温度为能量指标,系统研究了在加热条件下,钢内氢陷阱中氢的激发扩散效应,并研究了氢陷阱结合能、加热速度、钢板厚度、初始氢浓度以及氢陷阱密度等因素对Q235钢内扩氢效果的影响。结果表明,以上影响因素对扩氢速率曲线的峰值温度以及温度跨度存在一定的影响,对于钢的扩氢热处理来说,一定的加热温度和时间是保证陷阱氢充分激发并扩散的必要条件,该研究结果对扩氢热处理工艺的制定有一定的意义,并且对氢解吸试验的微观机理和理论分析有指导作用。

A two-dimensional finite element analysis model of random distribution of hydrogen traps was established. The activation and diffusion of hydrogen in the hydrogen trap were studied by using the temperature as the energy index under heating condition,and the effects of the binding energy,heating rate,thickness of steel plate,initial hydrogen concentration and hydrogen trap density on the hydrogen diffusion in steel Q235 were studied. The results show that the above factors have a certain influence on the peak temperature and temperature span of the hydrogen diffusion rate curve. For dehydrogenation heat treatment of the steel,a certain heating temperature and time are the necessary conditions to ensure that the trapped hydrogen fully diffuse out of the steel. The results have a certain significance to develop heat treatment process and guide the analysis of hydrogen desorption in steels.