Study of the Bulging Mechanism of Hydrogen Container in Thermal Power Plant

摘要

In the present paper, the bulging mechanism of hydrogen containers in thermal power plant is studied using TEM, SEM, hardness test and mechanical properties test methods. It is found that the ferrite grain boundary in the bulging area of hydrogen containers broadens, a lot of dislocations emit from the ferrite grain boundary, and in some case there are even micro-cracks in the ferrite grain boundary. The fracture surface of the specimen in the bulging area is intergranular fracture, while the fracture surface of the specimen in non-bulging area is dimple fracture. The percentage elongation of the specimen in the bulging area is lower than that in non-bulging area The residual hydrogen content in the bulging area is higher than that in non-bulging area. All these show that the bulging of hydrogen containers in thermal power plant is hydrogen attack.