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My initial journey into crucible steels.

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Took opportunity to polish one side of one and see. I overetched it which is why there are blue splotches. At first I thought nothing was etching, but oh, it's because there's so much cementite.


I wish my new phone and this message board got along better. Even if I rotate my photos the opposite direction they still upload sideways and low definition.



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Oh yea. Plenty for that. Planned on it actually. It was a happy accident. Shortly after these were made, i was approached by a student at a lab in Canada who wanted to write up a report on the st

Ive made 2 blades. One broke while straightening. Different viewing angles...   And the broken one...   Not too bad, ar

My most recent work. ~1.7% C  

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Still looks good!  The forum software does compress files that exceed around 1000 pixels wide.  Maybe if you resize 'em first?

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  • 4 weeks later...

So both of those pucks lost cohesion in the center due to forging it slightly wrong and voids.


Apparently the crucibles I've been using are crap. I switched to a different style suggested to me by Niko and another friend Josh.


This lead to better melting. Apparently the cheap crucibles oxidize a bit more at these temls than the nice ones.


This lead to healthier steel.


One of the two pucks I made shattered using a unique forging schedule than what's used commonly. The other, the one I will share pictures of is still forging nicely.










I started drawing it out in a different direction and found the small depression on the top was a little crusty and wanted to.form.small cracks so instead of grinding it all out, I cut the bar at that spot, leaving a third of the puck to the side and forging the other 2/3. I took the opportunity to cut most of the way and then snap to inspect grain (it is darker in spots because I laid it on something oily).




This also have me an opportunity to check for voids. Which there was none. Another testament to the better crucibles working...better.



The bar displayed crystalline structure longer than I liked, but this was still progress.





It's like right on the verge right here ^^^






Grinding off decarb is revealing the flow.


As I've repeated, I wish the magic would have happened sooner when I had more thickness because I am approaching dimensions where manipulation is not very practical and the pattern could use more forging to develop.


Ah well. Maybe. I still plan on drawing out further. If I decided to making paring knives or smaller knives or razors, I could probably pull some character out of this steel, but my intentions were full chef knives.


As it is I am poised to forge that 1.5# 1/3 of the puck differently and I may be able to pull something off for something big.


If not, I'm already lining up more melts to continue with my research.

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Forged the small section.


White blotches are decarb left on the blade surface. I wanted to take a peak with a ferric etch. This is a water pattern.








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  • 2 weeks later...

Back to the first side of the puck, the bar that was "on the verge".


It certainly did the job. This was ground into a Suhihiki kitchen knife. Not yet HT. Just peeking to see where it's at in ferric with a coarse grind. The bright splotches are the last remaining bit of decarb. It was the top of the ingot.







Edited by Daniel Cauble
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A small blade formed from the same half of puck that the previous post came from. This one has been heat treated and the decarb is revealing the steel as it grind away.20210511_133422.jpg




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