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Recent content by bilge

  1. bilge

    "Inert" Material for Covers for Antique Books

    Please be careful. Many plastics contain low molecular weight polymers to improve the plastics viscoelastic behavior during processing. Over time, these can leave the plastic and coat some cooler surface. The best examples are the low-molecular weight vinyls in many automotive applications...
  2. bilge

    What is Nicromol (or Nichromol)?

    Wow! That's a new one. I'll be interested in the answer, too. My guess is that it is a nickel-chromium-molybdenum alloy. But would it be a superalloy or just a moly bearing stainless steel.
  3. bilge

    ductile-brittle fracture transition temp

    When you report the B/B temperature, make certain that you also report the criterion you used. There a number of different ones.
  4. bilge

    Residual Stress

    The magnitude of the residual stress can be reduced by heating because the maximum residual stree that can be locked in a body is the yield strength of the material. As you heat the body, the yield strength decrease and so will the residual stress. There have been reports that vibrations at...
  5. bilge

    Mystery metal

    You were, in a small way, lucky. Never, but never, use a diamond wheel to cut a ferrous product. The iron and the diamonds will react to form an iron-carbide. The wheel will be ruined. How do I know? I blush ... Use cubic boron nitride instead. (Why did the guys in the tool crib allow you...
  6. bilge

    Titanium corrosion

    Schweitzer says that titanium is "good" (corrosion less than 20 mils per yesr) in 90% hydrogen peroxide up to a temperature of 200 F.
  7. bilge

    Allowable Chlorine levels at high temp for stainless

    Philip A. Schweitzer's book, "Corrosion Resistance Tables," has some data on the corrosion of a few stainless steels at a few Cl concentrations as a function of temperature. A better reference might be the ASM's Metal Handbook, volume 13, titles "Corrosion." It has a...
  8. bilge

    SS 304L for NITRIC ACID(68%STRENGTH)

    Schweitzer says less than 0.002 inches per year at room temperature.
  9. bilge

    History of Rockwell hardness tests

    It was invented in 1919 by a metallurgist named Stanley F. Rockwell. There is a library of technology at MIT (the Bitmer(?)) which might have the info you want. Then, again, you might want to check with the manufacturer, the Wilson Instrument Diivision of the American Chain and Cable Company...
  10. bilge

    Mechanical Properties of Aluminium Alloys

    Hard copy data is available in ASM International's Metals Handbook, Volume 2: Properties and Selection: Nonferrous Alloys. Many aluminum alloys are heat-treatable, so you generally need to know what condition (the pros call it "temper" designation) the alloy is in to know what its...
  11. bilge

    What temp can alloys be heated to without affecting mech props?

    Have you considered cooling the assembly down, e.g. in liquid nitrogen or in dry-ice and alcohol, to see if the parts could be loosened?
  12. bilge

    Alternative to red brass?

    Be careful in your selection of a metal to be next to wood. Wood is NOT a passive element. It gives off organic acids over time and the result can be devastating. A "museum of bullets" made its display cabinets out of wood only to find that all the lead cartriges soon formed a...
  13. bilge

    Glass fragments

    I would suggest a little experiment. Get one of the water filters used by back-packers (the "Katadhyn" sp? is best) which are used to filter out giardia and lung-worm cysts and see what if anything it picks up. Because of "static fatigue" in a water envirnoment, the glass...
  14. bilge

    We have been having aluminum bronze

    The recommended weld metal would be ERCuAl-A2. Use a preheat of 150C. ButI prefer brazing, too.
  15. bilge

    corrosion potential of pure metals in saltwater

    Trethewey and Chanberlain in "Corrosion for Students of Science and Engineering," page 112, give the fre corrosion potential of Ni200 in sea water as -0.1 to -0.2 Vsce and that of Ag -0.1 to -0.15 Vsce.
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