Jump to content

Doug Lester

Members
  • Posts

    5,162
  • Joined

  • Last visited

  • Days Won

    11

Posts posted by Doug Lester

  1. What do you mean by noisy?  If it sound like a jet engine revving up for takeoff then I would say that it is basically the nature of the beast.  If it is popping and sputtering then I would look to plumbing problems, however I would expect that when the pressure is too low which allows combustion in the burner tube.

     

    Doug

  2. I agree with Gerald, Metallurgy Fundamentals is a great text.  Unfortunately, like most text books the price has gone way up.  I don't remember what I payed for my copy but I just looked it up on Amazon Prime and it's $150.  However, if you can grit your teeth and bite the bullet, It's worthwhile.  This. along with Steel Metallurgy for the Non-Metallurgist is worth shopping for on the used book market.

     

    Doug

  3. I usually recommend Steel Metallurgy for the N0n-Metallurgist but the latest edition runs about $200 with some suppliers selling the first edition for almost as much.  I don't have personal experience with either but I would recommend Steel Metallurgy or Knife Engineering: Steel, Heat Treating, and Geometry.  They are soft backs and they both cost under $50.  A good library, both books and videos, is one the best tools you can have.

     

    Grain size and grain boundaries go together.  The larger the grains the longer the boundaries between them and the larger t he separation between the grains can occur leading to increased brittleness in the steel.  Thermal cycling is what decreases the size of the grains.  Normalization is what reforms the grains to a uniform size and I do this after forging.

     

    The way thermal cycling works is that the first heat is over the critical point (judge this by decollesance, not a magnet).  The second heat is just below the point where decollesance occurs.  The third cycle is just a little less hot than the second.  Each cycle allows smaller crystals to form at the boundries  of the previous crystals.  I do like to use a magnet to assure that the steel has converted from austenite ( face centered cube iron crystal) to ferrite (body centered cube iron crystal).

     

    With magnetism, steel looses it when it is heated above the Currie point which is usually below the critical point which is why the loss of magnetism can be misleading in detecting when the steel converts to austenite.  To me electron spin refers to the spinning of the electrons around thee nucleous  of an atom.

     

    The eutectoid point is where carbon is at maximum solution in the iron atoms in the austenite.  Your 1075 is an example of a steel that will do this.  Hypoeutectoid  steel is where the the austenite has less than its maximum carrying capp

     

    asity  of carbon atoms.  Hypereutectoid steel is super saturated with carbon atoms with the excess carbon atoms forming carbides with iron atoms or other alloying metallic elements.

     

    (Pardon the misspellings)

     

    Doug

    • Like 1
  4. Nice looking sword.  Actually, I was under the impression that Mr. Fogg had passed.  Nice to hear he's still with us.  I was reading a post on You Tube and the presenter from Japan said that there were only about 10 master swordsmiths left in Japan.  If that was correct it seems like it will be up to Western swordsmiths to keep the art of the Japanese sword alive.

     

    Doug

  5. I've go the reverse problem.  I really like 9260 but the only source for it here in the US stopped carrying it.  I found in the UK that the equivalent alloy is EN45 and I never found a supplier who would ship to the US.  I'll need to get my forge set back up, I was cleaned  out by a bugler, and I think I'll try 8760.

     

    Doug

    • Sad 2
  6. I read a statement from Tod Cutler that if he made knives and swords to the level of fit and finish found in period pieces he'd not be able to sell them because they'd look too amateurish.

     

    As a side, I remember Ed Caffrey posting a picture of a knife that he used translucent buffalo horn scales to show off the damascus pattern in the full tang.

     

    Doug

×
×
  • Create New...