OK....who actually can produce a hamon in A2 like Phill Hartsfield?
My first question is... why?
The entire point of alloyed steels like A2 or D2 is to
avoid a hamon or differential temper, and get the entire piece fully converted to martensite. It took a whole lot of research and incredible amounts of cash/labor to develop steels like those. Why go completely against what the material was designed for? What's to be gained? A2 is pretty dang tough with decent wear-resistance the "normal" way, so.... what's the point? It looks cool?
My second question is, how? As in, how much would the extra time and effort cost, and who's willing to pay for it?
Seems like trying to drink whiskey from a bottle of wine to me. *shrug*
To be fair, let me say that I just don't get real excited about hamons in the first place. (I know, I know... sacrilege! I'm probably gonna get slammed for saying that.)
Yup, they're pretty. But I remain thoroughly unconvinced that they improve performance in any way. Quite honestly, I have
serious concerns about leaving a transition area of pearlite in a blade composed of tempered martensite and who-knows-what... having said that, I also admit I've seen some blades with hamons perform
very well in hard use, so I may be over-thinking all that.