Hydrogen is a small atom. Hydrogen can cause major problems in various materials. It can migrate...

 

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Hydrogen is a small atom. Hydrogen can cause major problems in various materials. It can migrate inside the material and at the phase boundaries or microcracks hydrogen gas is formed at high pressure. The material then cracks. This is called hydrogen embrittlement. It is therefore important to be able to calculate approximately how far hydrogen can travel in the material at a certain temperature and after a certain time. There is a rule of thumb for this and it is expressed with the formula x =(D *t) Assume the temperature is 25\deg C. How far does hydrogen migrate in bcc-Fe and how far would it have migrated in fcc-Fe (if the phase had been stable at room temperature) in a month? Hydrogen is a small atom. Hydrogen can cause major problems in various materials. It can migrate inside the material and at the phase boundaries or microcracks hydrogen gas is formed at high pressure. The material then cracks. This is called hydrogen embrittlement. It is therefore important to be able to calculate approximately how far hydrogen can travel in the material at a certain temperature and after a certain time. There is a rule of thumb for this and it is expressed with the formula x =(D *t) Assume the temperature is 25\deg C. How far does hydrogen migrate in bcc-Fe and how far would it have migrated in fcc-Fe (if the phase had been stable at room temperature) in a month?