气相色谱研究金属中陷阱放氢速率常数和激活能

THE GAS CHROMATOGRAPH STUDY OF EVOLUTION HYDROGEN RATE CONSTANT AND ACTIVATION ENERGY OF TRAP IN METAL

业已知道当金属中溶有氢时,在受力条件下,氢就会向金属制件的薄弱区域扩散与富集,进而萌生微裂纹,并通过与裂纹的交互作用,最后导致氢脆事故的发生,因此,关于氢致开裂物理和化学过程的研究,一直受到人们的重视。

The kinetic parameters of grain boundary and precipitate interface in 18 Ni maraging steel were studied by gas chromatograph as hydrogen detctor. The evolution rate peaks of grain boundary and precipitate interface appeared at 378K and 405K with 3.00K min^(-1) heating rate and 0.55mm specimen thickness. The trapactivation energies needed to escape from these sites were obtained from the relationship between peak temperature and heating rate to be 14.2kJ mol^(-1) and 23.1kJ mo1^(-1), respectively. The rate constants of hydrogen evolution from these were 3.39exp (-14.2/RT) min^(-1) and 26.34exp (-23.1/RT)min^(-1), respectively.