Target Hardness…,

DanF

DanF

Knifemaker / Craftsman / Service Provider
Joined
Apr 17, 2017
Messages
1,438
For Waki’s and Dirks in the 16-24” oal range?
Thanks,
 
DanF said:
W2
Click to expand...
Focus on the microstructure more than the hardness.

Dial in your aus temperature, That's more important than getting tunnel vision on hardness.


Use a proper quenchant and grind thickness towards the edge to make sure you don't have pearlite hiding at the edge in the complete product then temper to your desired level of the ductility.

~60rc would be a good range.


There's a big problem here though.

60rc or any hardness is not universal in properties. The properties will greatly depend on what you did in the heat treatment steps even if the same hardness is achieved.

This is why selecting the proper austenitizing time and temperature can have a significant influence over the steels properties even if tempered to the same hardness.


So, you can't blast your steel with plate martensite, grain growth, pearlite nodules and retained austenite, and temper to a selected hardness value and make everything better at the edge. You still have those detrimental features hiding inside the steel at your edge as a result of the austenitizing and quenching that was done.
 
DeadboxHero said:
Focus on the microstructure more than the hardness.

Dial in your aus temperature, That's more important than getting tunnel vision on hardness.


Use a proper quenchant and grind thickness towards the edge to make sure you don't have pearlite hiding at the edge in the complete product then temper to your desired level of the ductility.

~60rc would be a good range.


There's a big problem here though.

60rc or any hardness is not universal in properties. The properties will greatly depend on what you did in the heat treatment steps even if the same hardness is achieved.

This is why selecting the proper austenitizing time and temperature can have a significant influence over the steels properties even if tempered to the same hardness.


So, you can't blast your steel with plate martensite, grain growth, pearlite nodules and retained austenite, and temper to a selected hardness value and make everything better at the edge. You still have those detrimental features hiding inside the steel at your edge as a result of the austenitizing and quenching that was done.
Click to expand...
Preach brother bear.

Good stuff.

Hoss
 
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