Just wanted to say thanks to everyone who responded. Our goal was to prove to the mill that our process did not induce the hydrogen into the part. We hardened some parts in nitrogen, never exposing them to endo, and they failed at the site of the inclusions, in the same fasion as the parts we...
Sorry for the lack of information. The inclusions are aluminum oxide, and we found them when the part broke during the endurance test.The material spec is 4350 aircraft quality. The material is hot rolled, turned ground and polished. The part diameter is two and one half inches. The gas is...
We are having problems with 4350 quenched and tempered parts failing an endurance test. The failures are linked to hydrogen damage at the site of large inclusions, app. one eight of an inch below the surface. The mill that produced the material has claimed that we induced the hydrogen into the...
