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Yes austempering and martensite tempering are different. After rereading my bainite and martensite sources yes I was in error about the bainite forming from martensite. Bainite references aside, your...

Differentially hardened blades are technically fully hardened, the part of the blade that is hardened (under the hammon) needs to be fully hardened like any other blade, on one of these though there...

To get the most out of your blade you need to fully harden it. When hardening steel the temperature is first raised above the critical temperature (CT) this forms austenite inside the austenite are...

I've used a stainless steel colander in a metal bucket, and have built a blade forge from regular red clay bricks. I use coal or charcoal to fuel it. It's very cheap and I love it for blade work.