Chris Paul Posted November 23, 2015 Share Posted November 23, 2015 Any help on how I can avoid this failure in my next attempt at forging chisels will be greatly appreciated. The material I'm using is new 5160 1" round bar. Using a gas forge with temp control, hammer and press for forging. After forging I did 2 normalizing / thermal cycles, first one at 1600, then one at 1550, soaked for 10 min each. I let them cool to the touch before the next cycle. Quench was done in 120 deg canola oil. Both chisels show longitudinal cracks. What did I do wrong? Quote Link to comment Share on other sites More sharing options...
Charles R. Stevens Posted November 23, 2015 Share Posted November 23, 2015 Pichtures would help. Quote Link to comment Share on other sites More sharing options...
Chris Paul Posted November 23, 2015 Author Share Posted November 23, 2015 Here you go - thanks. CP Quote Link to comment Share on other sites More sharing options...
ThomasPowers Posted November 23, 2015 Share Posted November 23, 2015 When using the press did the metal leave the press still glowing? Quote Link to comment Share on other sites More sharing options...
Chris Paul Posted November 23, 2015 Author Share Posted November 23, 2015 It's possible there were a few small localized spots where the steel got cooler than I would have preferred while in the press. The dies were not preheated. I'd say low orange / high red heat on the last squeeze. Really only used the press to straighten. Quote Link to comment Share on other sites More sharing options...
ThomasPowers Posted November 23, 2015 Share Posted November 23, 2015 Not the last squeeze *any* squeeze! Since both had cracks but they don't look the same I would guess process over material. (Though I am sure you have since checked to be sure the steel was what it was sold as and not an air cooling steel) Quote Link to comment Share on other sites More sharing options...
Frosty Posted November 23, 2015 Share Posted November 23, 2015 You're working it too cold. Frosty The Lucky. Quote Link to comment Share on other sites More sharing options...
Chris Paul Posted November 23, 2015 Author Share Posted November 23, 2015 Thanks Fellas, I'll try again hotter next time. Will also preheat my dies. Chris Quote Link to comment Share on other sites More sharing options...
Frosty Posted November 23, 2015 Share Posted November 23, 2015 I have good luck working spring in the high orange to low yellow and go back to the fire when it cools into the mid high orange. Frosty The Lucky. Quote Link to comment Share on other sites More sharing options...
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