Hydrogen trapping by TiC particles in iron

Abstract

The interaction of hydrogen with the interface of TiC inclusion in iron was studied by thermal analysis technique using gas chromatrograph as hydrogen detector. The amount of hydrogen evolved from trap site was measured and its relations with activation energy and trap binding energy were studied. The evolution rate peak appeared at 996 K when heated with 3 K/min heating rate. It is due to the hydrogen release from the interface of TiC inclusions. The trap activation energy needed to escape from the interface of TiC inclusion is obtained from the relation between peak temperature and heating rate as 86.9 kj/mol and the trap binding energy obtained from the relation between peak area and the hydrogen charging temperature is 28.1 kJ/mol. The energy level of the hydrogen around the trap site is estimated from the above values.