液态铁氮化可逆性研究

摘要

一直以来共聚焦激光扫描显微镜都被用来观测氮气环境中1级纯铁的原位冷却过程.液态铁可在1400℃以下的高温下通过氮化形成稳定化合物.该过程可通过两种方式实现.一种是通过将铁熔体置于氮气环境冷却凝固,另一种是通过将无氮铁置于1400℃的恒温及氮气环境中重熔.后一过程中液态铁氮化合物在氦气环境下可重新分解得到液态铁.%Confocal scanning laser microscopy has been used to observe in-situ cooling of Grade 1 iron whilst un-der a nitrogen atmosphere. Liquid iron has been stabilized to temperatures below 1400℃ through nitriding at high temperatures. This has been achieved in two ways. Firstly by exposing the melt to nitrogen and observing the onset of solidification whilst cooling. Secondly ,under isothermal conditions by remelting of initially nitrogen free iron at 1400℃ through the introduction of a nitrogen atmosphere. The latter process has been shown to be reversible with liquid iron being unstable once reverting back to a helium atmosphere.