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Subject: Hydrogen Embrittlement

Date: 10/01/03 at 12:35 PM
Posted by: Gary Peace
E-mail: gpeace@neo.rr.com
Message Posted:

We are having problems with parts failing an endurance test that has been linked to hydrogen damage located at the site of large inclusions in 4350 material. The mill that produced the material has claimed that we induced the hydrogen into the part during the heat treating process. We heat the parts to 1550F in an endothermic atmosphere for two and one half hours, oil quench, then double temper at 375F for two hours. We have never seen this problem before. I was under the impression that only atomic hydrogen can do this type of damage and a much higher temperature is needed to produce atomic hydrogen. Thanks in advance for any help.

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