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Recent content by M. BR

  1. M. BR

    Corrosion inside a tube

    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...
  2. M. BR

    Aluminum 7075 - T6

    no, after assembly, obnline testing
  3. M. BR

    Aluminum 7075 - T6

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

    Aluminum 7075 - T6

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

    Aluminum 7075 - T6

    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...
  6. M. BR

    Failure Analysis of small part

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

    Failure Analysis of small part

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

    Failure Analysis of small part

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

    Failure Analysis of small part

    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...
  10. M. BR

    Failure of tube/pipe

    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
  11. M. BR

    Failure of tube/pipe

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

    Failure of tube/pipe

    [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!
  13. M. BR

    Failure of tube/pipe

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

    Failure of tube/pipe

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

    Failure of tube/pipe

    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
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