- Joined
- Dec 28, 2003
- Messages
- 4,793
On a HI standard Katana sword I bought last summer (Bura), I noticed a blue mark on the edge of the blade and asked about it online at the time but got no responses. Somehow I failed to notice until today that this mark also is on the other side of the blade in the same place on the edge, although a bit broader and longer, just below the sweet spot about 1/3rd the way up the blade.
Now with a bit more experience and reading behind me, I realize that this mark was made by someone polishing out the edge of the blade, and holding the blade too long in one place and overheating the metal. The mark is a brownish-blue in color, and my question is, how damaging is this and can it be fixed? The temper has obviously been removed from this small section of the metal. Does that make it brittle, or too soft?
In Blade magazine a guy mentioned reheating this section and then requenching. Do you think that would work to retemper the damaged blade section?
Any tips from the knifemakers or mettalurgists out there would be welcome.
Thanks!
Norm
Now with a bit more experience and reading behind me, I realize that this mark was made by someone polishing out the edge of the blade, and holding the blade too long in one place and overheating the metal. The mark is a brownish-blue in color, and my question is, how damaging is this and can it be fixed? The temper has obviously been removed from this small section of the metal. Does that make it brittle, or too soft?
In Blade magazine a guy mentioned reheating this section and then requenching. Do you think that would work to retemper the damaged blade section?
Any tips from the knifemakers or mettalurgists out there would be welcome.
Thanks!
Norm