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  • Users: Greenleader
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  1. Greenleader

    Intermetallics. Metal molecules? Need clarification.

    I know conventional steel has no molecules, as the type of bond the atoms have is crystalline. However, since my recent melt result, I have been trying to understand exactly what type of structure/bond intermetallics have. As I read it, 2 metals form a covalent bond, i.e. molecular. Is that an...
  2. Greenleader

    Iron-niobium intermetallics

    I made an alloy that possibly formed Iron-niobium intermetallic filiments. I'm having trouble finding a micrographs of such a structure. Any hep? Google-fu is weak. Thanks.
  3. Greenleader

    Epsilon-iron allotrope.

    Simple question, when and where does epsilon-iron, (hexagonal, close packed), exist. That is on the surface of the earth? Thanks.
  4. Greenleader

    Rhenium in carbon steel. Non heat environ.

    Would you benefit from the addition of rhenium in medium carbon steel, other than the obvious high heat environs? Rhenium is a very interesting transition metal, with some very good qualities. Thanks.
  5. Greenleader

    Tungsten in medium carbon steel

    Would the addition of tungsten, .55%, to 4340 mod, (300m),contribute a few points of hardness after tempering to spec? I would like to add a little hardness without sacrificing strength or toughness or reducing the draw temp.
  6. Greenleader

    Looking for 6000 deg refractory

    Hello. I am looking for a refractory that can withstand up to 6000 F, to hold large,(12 pound charge), thermit reactions. I prefer something I can shape myself. Thanks.
  7. Greenleader

    Looking for a source of extreme temp refractory

    Hello. I am looking for a supplier of magnesium oxide, aka, magnesia tar. There are a couple of forms it comes in, but it is basically the same chemical, and about the only thing available, outside black projects, that will routinely take 5 to 6000 degrees F. Thanks.
  8. Greenleader

    Need a light for fuel tank inspection

    Greetings. I am looking for a portable light source to use for inspecting fuel tanks, empty fuel drums, solvent containers, etc. The requirements are; It cannot be electrical, even though they make electric lights for this purpose. Of course no flame, or heat. Must be portable, and be able...
  9. Greenleader

    Using vibrations to control stresses and structures in steel

    Hello. Could you steel minded folks kindly take a look at my thread concerning crystal manipulation in steel using vibration. Thanks http://www.eng-tips.com/viewthread.cfm?qid=126500&page=1
  10. Greenleader

    Using vibration to control stress during martempering

    We know you can use sub to low sonic waves to relive stresses in carbon, alloy steel cased by machining, welding etc. When martempering, (marquenching), carbon alloy steels, is it possible to use the same vibrational frequencies that reduce stress, to reduce the built in stresses caused by the...
  11. Greenleader

    Carbon atmospheres

    Simple question; I am wondering in which atmosphere steel, at critical temperature more easily absorbs carbon. Carbon monoxide, or carbon dioxide? Thanks.
  12. Greenleader

    Ultrasound and grain structure in steel

    Hello. I asked a question that some of you might be able to answer here; http://www.eng-tips.com/viewthread.cfm?qid=121723&page=1 Thanks
  13. Greenleader

    Grain and structure manipulation via ultrasound

    I'm looking for good sources for information regarding grain and structure manipulation in steel via ultrasound. Thanks.
  14. Greenleader

    Can 1.5 Tesla manipulate grain structure?

    I'm looking for a reasonable strength magnetic field for manipulating grain structures in Si steels. This paper claims significant results with a 30 Tesla field. I'm looking at similar results with 1.5T. Any thoughts or suggestions? http://www.msm.cam.ac.uk/phase-trans/2004/magnet.pdf
  15. Greenleader

    Black magic metallurgy

    I'm looking for any information, specs, etc., on exotic maraging alloys used in Olympic bobsled runners. Any suggestions? Thanks.
  16. Greenleader

    Manipulating crystal structure via mag fields.

    I'm looking for some easy reading on the subject of manipulating crystal structures in steel alloys, via magnetic fields. I'm having a difficult time sorting out the good from the not so good. Any suggestions? Thanks, Jerry
  17. Greenleader

    Would 4340 modified, (300m), be con

    Would 4340 modified, (300m), be considered a magnetic soft alloy? It contains 2.0% Si and .4% carbon Thanks.
  18. Greenleader

    Lath martensite in high carb steel?

    Here is a paper that claims the formation of lath martensite in high carbon, (1.4%)steel. http://www.paper.edu.cn/scholar/download.jsp?file=liuyongning-8 With the help of some metallurgist friends, (I am not), I gathered that the reason lath martensite was formed, is that much of the carbon did...
  19. Greenleader

    Silicon uptake

    How does steel absorb silicon for alloying during a melt? What form of silicon is added, and under what conditions? I hope this is an appropriate question for this forum. Thanks, Jerry
  20. Greenleader

    Different martensites?

    I am aware of a few different types of martensite, but I have run across some lately, that I am not familiar with. Could someone please direct me to a single source, with a list and description of all types of martensitic structures? Thank you in advance, Gerald

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