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  1. Helicopterjunky

    Lets talk about the Stimulus Plan....

    All you numerical people out there may get a kick out of this article. Not the first time a simplified formula has led to problems. http://www.wired.com/techbiz/it/magazine/17-03/wp_quant?current
  2. Helicopterjunky

    Better adhesion WITHOUT prepping surface?????

    Investigate "adhesive promoter" and follow manufacturers instructions.
  3. Helicopterjunky

    Time at Temperature, Normalizing

    Weldtek...Easy way to tell is to take part and drill hole to center of section. Insert thermocouple into center of section and a thermocouple to outside surface of part. Load the part with equivalent furnace, furnace load, same loading, # parts, # pounds, # trays or fixtures as manufacturer...
  4. Helicopterjunky

    Hardness testing on part casted with IC 8620

    Unfortunately this is sometimes what you can expect when going to China to save pennies. Best bet might be just to send them back to your Chinese supplier for refund or replacement or better yet let them restore the surface. Why we as engineers work to aid our low cost structure competition...
  5. Helicopterjunky

    Hardness testing on part casted with IC 8620

    SeasonLee, I do not think the decarbed surface is related to casting. Go to a very reputable heat treater. Explain to them what you have and ask them if they would carbon restore the parts for you. They will most likely want to cut up several parts and measure depth and extent of decarb...
  6. Helicopterjunky

    Hardness testing on part casted with IC 8620

    SeasonLee, Parts were most likely decarbed from your China supplier. The local heat treater should not be at fault because they are staring out with decarbed product. If you had known it was decarbed before you had sent it to the local heat treater, they could have carbon restored the surface...
  7. Helicopterjunky

    Carbon reinforced PEEK galvanic Corrosion

    Thanks for the feedback everyone. I suspected there could be issues with Carbon reinforced PEEK and steels, as I had seen problem in past when coupled with Aluminum. It is a great material just have to be careful in the application.
  8. Helicopterjunky

    Carbon reinforced PEEK galvanic Corrosion

    Has anyone experienced galvanic corrosion by attaching Carbon reinforced PEEK with metals, specifically steels? Any info appreciated.
  9. Helicopterjunky

    Pitting corrosion in anodised aluminium

    Yes, I am agreeing with second post with the exception that even when you sand out visible pits you will not have gotten rid of all the corrosion. You will need to etch the aluminum and invariably many of the pits will open up again. That is because the corrosion tunnels down into the material...
  10. Helicopterjunky

    Pitting corrosion in anodised aluminium

    Aluminum will pit by corrosion near salt water or salt air. Just that simple. Even when anodized properly, the salt environment will still, after enough time, attack the aluminum. The correct way to determine if this mast is still usable will be very expensive. If pits are not too deep you...
  11. Helicopterjunky

    Please review my water quench plan

    Knowlittle, You may crack your part upon quenching into water. You have too many sharp corners. A sixteen pound part into a bucket sounds real iffy. Without agitation it will not quench uniformly, soft spots and more chance to crack. Most compelling reason not to try this is it will...
  12. Helicopterjunky

    Incoloy 909 help.

    Inco 909 has a very low,(less than half) of conventional superalloys Coefficient of Thermal Expansion (CTE). The material is often used in high temperature jet engine applications. Because it has no Chromium, it has poor general surface oxidation resistance as well as suffers from a condition...
  13. Helicopterjunky

    Need Ti-6Al-4V seamless tubing

    What about Continental Steel and Tube in Ft. Lauderdale, FL? Good Luck
  14. Helicopterjunky

    Alloy Depletion

    See the following link http://www.industrialheating.com/Articles/Column/868a4b4478cb7010VgnVCM100000f932a8c0____
  15. Helicopterjunky

    Alloy Depletion

    Coatingsguy, I would think you could create samples of alloy depletion by running them in an oxidizing atmosphere at varying temperatures and times. Your sample is most likely using an etchant to microscopically detect an alloy depletion zone. Even certain vacuum furnace conditions could...
  16. Helicopterjunky

    Outsourcing stage 3 - Design Tasks

    By the time you do all the detailed drawings, specifications and requirements and then have to recheck everything against them once you receive product back you will have done 95% of it yourself. The risks to your company are very high, just so they don't have to be bothered watching the last...
  17. Helicopterjunky

    MP35N Strain Hardened Ground AMS 5844

    All I know about MP159 is that it has higher alloying to allow strain hardening of larger product sizes, greater than several inches. Both of the Multiphase alloys require strain hardening, usually at the mill, to achieve their maximum strength level.
  18. Helicopterjunky

    Ultrasoinc Impact Treatment questions

    If you mean Ultrasonic Peening see www.sonats.com. If you mean Utrasonic Impact Machining see bullen-ultrasonics.com
  19. Helicopterjunky

    meaningless greetings

    This string made me laugh.....................Thanks!!! That is one of my pet peeves also. Shallow self absorbed people do this all the time. My response is normally "Im' here". That ends most of it. Even worse are those boneheads that do this in meetings. "Hey Helicopter what is your...
  20. Helicopterjunky

    Carburizing Surface hardness

    I agree also. May have some retained austenite but hard to tell at the 500X magnification. Can you get some higher magnification micrographs? Have your microhardness test inconsistencies from heat treater and test lab been resolved?

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