Whats Going On Here?

D

docmott

Joined
Dec 10, 2022
Messages
82
This has happened to a few blades I've made. Always just one one side and could be any where but mostly on the blade not the handle part. I do use a wood fired forge and it has air introduced from my compressor. im thinking its caused by the air hitting the red hot blade? You can see it close to the tip. Ideas?
https://flic.kr/p/2o9vvTy
 
Just hazarding a guess but i think You just entered the twilight zone of alloy segmentation and banding in simple steels. I experienced similar circles for the sake of defining in some 5160. It was explained as the steels alloys becoming seperated and segregating from forging at too high a temperature and then the steels alloys cooloung faster at the outside than the inside. The steel alloys tend to separate from the other alloys at temps around 2200F or higher.
The banding is whats responsible for us sometimes getting a hamon when we weren't trying for one. Heat treaters sites indicated that normalizing and annealing will help reduce the effects.
It was explained to me that we need to weld at one temp and forge at lower temps to avoid this segregation of alloys
 
I am thinking it’s caused by my forge where the air is introduced to it. That must be hotter at that point then the rest of the forge.
 
I think the dots are probably a result of over heating, but I really don't know. It may also just be forge scale...

I think the wavy lines in the edge are alloy banding like @velegski said.
 
thank you, I feel you're right. I have some new ideas to change my forge to dissipate the air.
 
2 things I'll try to do, 1 make something that holds the blade In place. 2 disperse the air flow, but the air makes the coals hot.
 
Yes,
The blade tip was overheated. I didn't respond in your other thread because it was getting derailed by the TME discussion.

Whay steel is the blade? The edge looks laminated.
 
the steel is 1095, im pretty sure the lines on the edge are from the finish grinding. I'll break it out and take a close look at it. today im looking into changing the way the air is coming into the forge. thanks
 
I just looked, I sold that knife. I found the pic and yes I really see the waves of the edge, interesting. I guess I should stat looking closer at some of this. I dont have much Control over the forge except the air and the only way I check it with the magnet and so far it seems to work. I got some ideas, we'll see what happens.
 
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