Knives wont stay sharp

T

Technohedge

Joined
Sep 9, 2018
Messages
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Hi all, recently made a set of kitchen knives with Nitro-V which I had heat treated to about 59hrc

I was careful to not go too crazy when putting on the final grind so as not to ruin the temper. I did have the tips of my fingers get burnt a little on the odd occasion, however there was no observable colour change or burning of the edges. Dipped in water every pass

The knives were sharpened using a lansky and then put to use. After a month or so am seeing flat spots and dings in the edge?

Ive given them a resharpen and gonna see how it goes.

Could I have buggered the temper on them?
 
I'm not a knifemaker; but kitchen knives take a lot of abuse. I'll let the others address the idea that you might have affected the heat treat or temper; and suggest considering how they were used. Think about the cutting surfaces on which they were used, what the edges may have impacted, etc.
Best of luck sorting things out
 
hhmoore said:
I'm not a knifemaker; but kitchen knives take a lot of abuse. I'll let the others address the idea that you might have affected the heat treat or temper; and suggest considering how they were used. Think about the cutting surfaces on which they were used, what the edges may have impacted, etc.
Best of luck sorting things out
Click to expand...
hhmoore said:
I'm not a knifemaker; but kitchen knives take a lot of abuse. I'll let the others address the idea that you might have affected the heat treat or temper; and suggest considering how they were used. Think about the cutting surfaces on which they were used, what the edges may have impacted, etc.
Best of luck sorting things out
Click to expand...

hey, how is that little z-wear edc holding up?
 
Technohedge said:
Hi all, recently made a set of kitchen knives with Nitro-V which I had heat treated to about 59hrc

I was careful to not go too crazy when putting on the final grind so as not to ruin the temper. I did have the tips of my fingers get burnt a little on the odd occasion, however there was no observable colour change or burning of the edges. Dipped in water every pass

The knives were sharpened using a lansky and then put to use. After a month or so am seeing flat spots and dings in the edge?

Ive given them a resharpen and gonna see how it goes.

Could I have buggered the temper on them?
Click to expand...

probably too soft for the geometry.
 
Could be fatigued steel at edge from grinder
Get your stones out and give them a good sharpening to get rid of it and see how that works
 
Need more details. Put to use how? Chopping bones? How big are the dings and flat spots?

It’s speculation unless You provide some details and pics.
 
Stacy E. Apelt - Bladesmith said:
The major details we need are:
How was the HT done?
How was the Rc59 determined?
Click to expand...

HT was done at a professional industrial HT works, the guy who did it does lots of knives. He seemed well informed (from what I can tell) and was awareof the alloy he was treating. I dont have the specific temperature report on me to quote.

The hardness was determined from what I can see by a hardness tester (the HT place did the test and gave me the report). There were multiple witness marks from the test on the handle area.

As far as I know the knives havent seen anything excessively hard to chop against. The standard wooden chopping board mainly.
 
Technohedge said:
The knives were sharpened using a lansky and then put to use. After a month or so am seeing flat spots and dings in the edge?
Ive given them a resharpen and gonna see how it goes.
Click to expand...
How can anyone know what happened and how was used that knife ? Why you don t make some test and see what you have ?
 
I have resharpened them, so I cant post any edge pictures.

They havent been used for anything other than cutting veg on a wooden chopping board so far.

Will see how the resharpen goes
 
You'll see people who insist they only have a wooden cutting board take their chef knife and cut a piece of pie out of a pyrex pie pan. Hard to guard against that.

59Rc is pretty soft for Nitro-V in the kitchen, but I still wouldn't expect flat spots except from plate impacts, or if thrown in the sink with other ceramics (mugs, glasses,etc.). 2nd on all the previous questions too.
 
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I chuck nitro-v into the same lot as aebl which preforms best in the 60-62 range with the thumbs up twords the upper end.
 
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