1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.

  2. Week 39 of the BladeForums.com Year of Giveaways is live! Enter to win a Cold Steel Tuff Lite & Cold Steel Prize Pack

    Click here to enter the drawing for your chance to win a Cold Steel Knives Tuff Lite & Cold Steel Merch Prize Pack , Bladeforums.com swag or memberships!
    Be sure to read the rules before entering, and help us decide next week's giveaway by hitting the poll in that thread!

    Entries will close at 11:59PM Saturday, Sept 28 ; winners will be drawn on Sunday @ 5pm on our Youtube Channel: TheRealBladeForums. Bonus prizes will be given during the livestream!


    Questions? Comments? Post in the discussion thread here

Call for Charpy toughness samples

Discussion in 'Shop Talk - BladeSmith Questions and Answers' started by Larrin, Jan 26, 2018.

  1. Larrin

    Larrin Gold Member Gold Member

    Jan 17, 2004
    I will test it we just need people willing to heat treat and machine specimens. We have a few individuals willing to help so far but we certainly haven't reached a saturation point yet.
     
    hugofeynman likes this.
  2. rodriguez7

    rodriguez7 KnifeMaker / Craftsman / Service Provider Knifemaker / Craftsman / Service Provider

    Feb 1, 2009
    Can someone tag Nathan Carothers here. I’m sure he would be willing to contribute.
     
  3. Stromberg Knives

    Stromberg Knives KnifeMaker / Craftsman / Service Provider Knifemaker / Craftsman / Service Provider

    741
    Jan 3, 2015
    How tight are the tolerances for the specimen?
     
  4. DevinT

    DevinT KnifeMaker / Craftsman / Service Provider Knifemaker / Craftsman / Service Provider

    Jan 29, 2010
    All the ones I’ve done have been +/-.001 on the thickness and width, length have run a little long, maybe .05 or so.

    Hoss
     
  5. Jrmysell

    Jrmysell

    390
    May 18, 2014
    I don't have any, but ELMAX would be cool to see compared as well.
     
  6. Larrin

    Larrin Gold Member Gold Member

    Jan 17, 2004
    I will email him.
     
    rodriguez7 likes this.
  7. Larrin

    Larrin Gold Member Gold Member

    Jan 17, 2004
    The ASTM standard says plus or minus 0.075 mm (~0.003 in).
     
  8. Willie71

    Willie71 Warren J. Krywko. Part Time Knifemaker Knifemaker / Craftsman / Service Provider

    Feb 23, 2013
    If you are keeping a list, Larrin, I checked my stock, and in addition to the z-wear and cru-wear already mentioned, I’ll do 8670 in two hardnesses. I’m seeing if I can get a sample of 20cv to compare to my third generation m390. If I can, I’ll do that as well, and third, I’ll do two extra z-wear samples trying two vs. three tempers, compared to the four I normally do. I don’t think four is absolutely needed, but I’d like to see the differences between two, three, and four tempers.
     
    rodriguez7 and hugofeynman like this.
  9. Larrin

    Larrin Gold Member Gold Member

    Jan 17, 2004
    Sounds great! If it were me choosing I would keep the two temper comparison but replace the three temper with a 24h cryo to compare a 30-60 minute cryo with the sometimes recommended longer cryo.
     
  10. Larrin

    Larrin Gold Member Gold Member

    Jan 17, 2004
    rodriguez7 likes this.
  11. Willie71

    Willie71 Warren J. Krywko. Part Time Knifemaker Knifemaker / Craftsman / Service Provider

    Feb 23, 2013

    Sure. I can do that.
     
  12. JTknives

    JTknives Blade Heat Treating www.jarodtodd.com Knifemaker / Craftsman / Service Provider

    Jun 11, 2006
    Has any one offered up cruforgeV yet. I have a small stick I got from Salem that I could forge down into a few coupons.
     
  13. Larrin

    Larrin Gold Member Gold Member

    Jan 17, 2004
  14. DevinT

    DevinT KnifeMaker / Craftsman / Service Provider Knifemaker / Craftsman / Service Provider

    Jan 29, 2010
    15N20 on it’s way to Larrin today.

    Hoss
     
  15. JTknives

    JTknives Blade Heat Treating www.jarodtodd.com Knifemaker / Craftsman / Service Provider

    Jun 11, 2006
    What did you settle on for heat treat parameters?
     
  16. DevinT

    DevinT KnifeMaker / Craftsman / Service Provider Knifemaker / Craftsman / Service Provider

    Jan 29, 2010
    1470*, 375* x 2 = 60.5 hrc

    Hoss
     
    Justin Schmidt and Willie71 like this.
  17. Larrin

    Larrin Gold Member Gold Member

    Jan 17, 2004
    Oh boy!
     
  18. rodriguez7

    rodriguez7 KnifeMaker / Craftsman / Service Provider Knifemaker / Craftsman / Service Provider

    Feb 1, 2009
    I really like the fact that you guys are sharing all the heat treat data with us! Gives us something to work off of. Hopefully I’ll have most of my heat treat equipment by the summer. Excited to try some of this! Thanks everyone!!!
     
    Ken H> likes this.
  19. skillgannon

    skillgannon

    991
    Apr 27, 2009
    Hopefully it all goes in a nice sticky so it's easy to find once I get my oven
     
  20. hugofeynman

    hugofeynman Gold Member Gold Member

    563
    Jan 18, 2011
    I think I’ve convinced some friends to make and heat treat pieces in K600 (0,45% carbon, 4% nickel), A8mod and Ultrafort (Maraging steel). Will probably take some time until they finish it.
     
    Larrin likes this.

Share This Page