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Recent content by jessieleo99

  1. jessieleo99

    Effect of microstructure on crevice corrosion for SDSS

    In theory, plate and forging shouldn’t behave differently if both meet specs.
  2. jessieleo99

    Help finding a heat resistant, non-conductive, and pressure tolerant material

    Aremco 526N or 552?
  3. jessieleo99

    Help finding a heat resistant, non-conductive, and pressure tolerant material

    Have you tried those little ceramic resistor tubes you can find in old electronics? They can handle crazy heat and might be just the right size for your 6mm brass cylinder. Just wrap your nichrome wire around one and seal it in with some high-temp RTV (the red stuff). Not perfect, but it's held...
  4. jessieleo99

    Stainless Steel for ASME BPVC VIII

    Stanford Advanced Materials provides stainless steel tube products. Specific data can be viewed on the website: samaterials.com
  5. jessieleo99

    Material 12L14 Steel

    It is likely not critical. A 5% difference in RA is generally a small variation in materials with similar physical and chemical properties particularly if your application does not heavily rely on ductility or involve high deformation.
  6. jessieleo99

    Micro cracks appear in ALSi10Mg alloy castings

    Hello everyone, I am currently working on a production project for aluminum alloy castings and have encountered some challenges. We are using the ALSi10Mg alloy, however, during the cooling stage, microcracks have appeared. Here is the relevant data: Alloy composition: Si 10%, Mg 0.3%, Cu...
  7. jessieleo99

    A182 F9 and F91 metallurgical differences

    P91 has high creep strength and thermal stability and can be used for a long time in high-temperature and high-pressure environments above 600°C.
  8. jessieleo99

    Stainless steel pipe continuous solution annealing by induction heating

    For the wall thickness of 0.38”, induction heating at 1060°C for 1 minute should be sufficient assuming uniform heat penetration.
  9. jessieleo99

    300M - 4340M AMS 6419 Hardness All over

    The larger parts, even though only 2" thick, have more thermal mass than the 1" rounds. This can lead to slightly slower cooling rates after austenitizing, which may affect the final microstructure and result in a slightly harder surface. You might try adjusting the cooling process or...
  10. jessieleo99

    What brass or bronze for water couplings?

    Is the fitting in contact with regular drinking water or salt water? If it’s drinking water, brass is usually the better choice since it has good antibacterial properties and is more cost-effective. I’d recommend C36000 (Free-Cutting Brass) for that. But if it’s for saltwater or acidic...
  11. jessieleo99

    Seeking Advice on Optimal Chemical Composition for Tooth Adaptor Casting in HEMM Buckets.

    I agree that ASTM A128 Hadfield manganese is an excellent choice due to its suitability for impact and abrasive conditions. However, it is also advisable to consider using austenitic manganese-nickel steel and chromium-molybdenum alloy steel (AISI 4140/4340) for such applications...
  12. jessieleo99

    Material to outlive the Giza Pyramids

    I think it should be possible. Stainless steel is resistant to corrosion and oxidation. The durability of stainless steel means that it does not require frequent coating or repair. Perhaps all you need to do is clean and inspect it regularly...
  13. jessieleo99

    Stainless steel performance test fail

    It is very likely. Excessive current can overheat the weld, causing a wider and more fluid weld pool. This can lead to poor fusion, undercutting, or excessive penetration, all of which weaken the joint and may cause failure in a bend test. The interpass temperature for 309L electrodes is...
  14. jessieleo99

    Axle failure, thoughts

    The high surface hardness, possibly caused by surface hardening techniques like quenching or induction heating, may result in a relatively softer core. A large hardness gradient can lead to brittle fracture under high-stress conditions. This is especially true when the component is subjected to...
  15. jessieleo99

    Failure of Wind Fence due to corrosion

    I think you should consider switching to more corrosion resistant fasteners, such as duplex stainless steel or fasteners designed for coastal environments. Or you could add a corrosion-resistant coating to the material. For example, use a powder coating on galvanized steel, or a marine grade...
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