10-15-2018, 10:36 PM
I have a few basic questions on tempering.
What happens to hardness if a blade is tempered more than once?
How is hardness is changed if a blade is tempered to 450° the first time and then, say, 300° the next time?
Or, conversely, 400° the first time and 600° the second?
And lastly, how long does a blade have to be at tempering temperature to make a difference? What if the blade only reaches tempering temperature for a few seconds and then was allowed to air cool?
What happens to hardness if a blade is tempered more than once?
How is hardness is changed if a blade is tempered to 450° the first time and then, say, 300° the next time?
Or, conversely, 400° the first time and 600° the second?
And lastly, how long does a blade have to be at tempering temperature to make a difference? What if the blade only reaches tempering temperature for a few seconds and then was allowed to air cool?