Question

Why increased strength is susceptible to hydrogen embrittlement?

Answer 1

Answer:

Fast cooling in combination with steels with higher strength can give a hardening effect. If hydrogen is present there is a great risk for hydrogen cracking. Thick plates and a low heat input gives a high cooling rate and this increases the risk of hydrogen embrittlement. Hydrogen embrittlement is a process resulting in a decrease of the toughness or ductility of a metal due to the presence of atomic hydrogen. The first, known as internal hydrogen embrittlement, occurs when the hydrogen enters molten metal which becomes supersaturated with hydrogen immediately after solidification.

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