Originally posted by Alexander13:
............is that just a natural occurrence when those 2 materials are forge welded?
Joel
Correct.
Imagine that when you grind up from the cutting edge to the spine, you are creating a plane from the center of the blade to the full thickness.
This line runs at a tangent across the weld zone, exposing all of the weld and transition regions of the two steels.
Keep in mind that while at welding heat, Carbon will migrate from one place to another in an effort to equalize concentration.
The core of 1095 is Carbon rich.
The 420 is carbon deficient.
So they want to equalize, and what you end up seeing is the areas of varying carbon content.
The real shiny part at the edge of the transition is where the 420 has "sucked" the carbon out of the 1095, leaving an almost pure ultra thin layer of iron. It is truly shiny.
The actual cutting edge is so far away from any activity that it is not effected.
It would take hours and hours at welding heat for the entire billet to equalize.
But for the time I'm there, it creates a pretty dramatic display.
Good question.