Hydrogen Embrittlement

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Do you know Hydrogen Embrittlement ?

by metalkunde on Jan.24, 2012, under Metallurgy Phenomena

Hydrogen embrittlement is the process by which various metals, most importantly high-strength steel, become brittle and fracture following exposure to hydrogen. Hydrogen embrittlement is often the result of unintentional introduction of hydrogen into susceptible metals during forming or finishing operations.

Hydrogen embrittlement is also used to describe the formation of zircaloy hydride. Use of the term in this context is common in the nuclear industry.

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Hydrogen Embrittlement

by metalkunde on Feb.05, 2011, under Metallurgy Phenomena

Hydrogen Embrittlement – Definition and Meaning

When tensile stresses are applied to a hydrogen embrittled component it may fail prematurely. Hydrogen embrittlement failures are frequently unexpected and sometimes catastrophic. An externally applied load is not required as the tensile stresses may be due to residual stresses in the material.

Hydrogen Embrittlement in carbon steel, zinc plated part. Source:http://www.atclabs.com/

The threshold stresses to cause cracking are commonly below the yield stress of the material. High strength steel, such as quenched and tempered steels or precipitation hardened steels are particularly susceptible to hydrogen embrittlement. Hydrogen can be introduced into the material in service or during materials processing.

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