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Dear Forum, What would be your thoughts on following corrosion (file attached). What could be the cause? The tube has a 10mm inner diameter, material is 4140 heat treated in salt bath. The tube was never used, was in storage, and after a month when it was going to be assembled in the machine...

no, after assembly, obnline testing

Its not fatigue, the part was just machined and assembled.

I was also suprised analysing it..... but on SEM images/analysis there was no signs of deformation, voids... nothing...

Hello guys, I'm doing a failure analisys on an aluminum 7075 T6. I think the failure mode is brittle. Attached the SEM image. The supplier send the "recipe" for the T6. What do you think about this recipe? Solution Heat treatment: 470°C(880F) - 2h - water cooling Precipitation: 120°C(250F)2h...

to understand the function....https://files.engineering.com/getfile.aspx?folder=4aeef55e-c8dd-4da6-b7b7-dc555508e448&file=image_3.pdf

See if the images help. Its a trigger barhttps://files.engineering.com/getfile.aspx?folder=10f8cb94-4a69-4334-9b91-66088bd0982c&file=image_2.pdf

I dont think is fatigue striations…but maybe… if it is striations (fatigue), do you think it started on that dark area?

Hey guys, Need some help to understand the fracture surface attached (SEM images) The part fractured during assembly, with little stress. Inthe middle of the fracture there is this kind of inclusion, the way aroud of it looks spherical, and it possible to identify dimples. Never seen...

Hi guys, just made some some pictures of the microstructure. Remembering its a 410 Stainless steel. Does the cracks looks like intergranular cracks? For me not.... What do you Think?https://files.engineering.com/getfile.aspx?folder=70eac7fd-81a5-457a-a51b-2b43b4672afb&file=micro_H.pdf

Wouldn't lamellar tearing only happen in weld areas? There is no weld in this section, the tube is screwed to the frame.

[highlight #FCE94F]Torsional overload at 0 hours of service?[/highlight] I thought it maybe could happend during the assembly, excess of torque during the assembly... ? [highlight #FCE94F]This happened as the barrel was being screwed into the receiver/frame?[/highlight] Yes, you are right!

Do you agree with the start point. The red arrow. What is the meaning of "PVOP" - This mean propagation

Another picturehttps://files.engineering.com/getfile.aspx?folder=37f31dc9-af14-47fb-aa8e-f460d5fa7553&file=CH_2_(1).jpg

It is also a 410 steel the same hardness (40 - 44HRC). Atteched the side cut of the fracture.https://files.engineering.com/getfile.aspx?folder=63d56b25-7f99-4d85-9cc6-0cf924f80da2&file=IMG_7394-1.jpg

Hello Guys, Need help understanding where this failure started. This is a 410 stainless steel. The tube failed with 0h of service. I think is torsional overload, starded on the radius at 11/12 o clock (not sure), and also not sure the if its propagate to the left "anticlokwise". Do you...