03-12-2018, 08:46 PM
Mr. Mike, I hate story problems. Answer: The HRC 55 train would arrive at the station 3:44 before the HRC 62 train.
It seems obvious to me at least and I assume that others have also noticed, that burr material is substantially different than the hard steel of the blade. I’ve seen burrs that can be bent back and forth many times acting more like gold than hard steel. Hardened steel is simply not that ductile. Hard steel chips and fractures while burr material acts like it has lost its hardness.
I’m not concerned here about how or why this happens, but simply noting that, for whatever reason, burrs act like very soft, ductile steel.
If this is true, I have two questions:
1. Is the burr material from RHC 62 steel any harder than a burr from RHC 56 steel or have both been equally softened during the sharpening process effectively equalizing both as far as hardness goes?
2. What implication does have for the very apex of the edge? How deeply into the blade does the softer metal go?
Would we deign to consider that the hardness of the apex of a hard steel blade is really equal to that of a softer steel blade, and that hard steel only occurs again significantly back from the apex?
Considering how soft and ductile burr material appears to be, it does beg the question.
It seems obvious to me at least and I assume that others have also noticed, that burr material is substantially different than the hard steel of the blade. I’ve seen burrs that can be bent back and forth many times acting more like gold than hard steel. Hardened steel is simply not that ductile. Hard steel chips and fractures while burr material acts like it has lost its hardness.
I’m not concerned here about how or why this happens, but simply noting that, for whatever reason, burrs act like very soft, ductile steel.
If this is true, I have two questions:
1. Is the burr material from RHC 62 steel any harder than a burr from RHC 56 steel or have both been equally softened during the sharpening process effectively equalizing both as far as hardness goes?
2. What implication does have for the very apex of the edge? How deeply into the blade does the softer metal go?
Would we deign to consider that the hardness of the apex of a hard steel blade is really equal to that of a softer steel blade, and that hard steel only occurs again significantly back from the apex?
Considering how soft and ductile burr material appears to be, it does beg the question.