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Old 05-04-2022, 01:52 PM   #1177
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I'm fascinated by the balancing act between hardness and toughness but I'm just a tourist. You're the real deal; a modern-day blacksmith.
Like most things, I know enough to get me in trouble. Itchi knows some about this too making knifes. To get hardness you heat up to get the desired lattice structure which also puts the carbon atoms from face center cubic to body center cubic trapping the carbon. Then you quench, but these lattice structures are under a lot of internal stress so you temper. Tempering releases the internal stress by putting some of the carbon back into a more even distribution and also reduces the grain boundaries. You will hear some older guys say it "grows the grains together" though technically that is not really the case. You can tell with ferrous steels since they lose their magnetism when it goes BCC. Most stainless steels are already BCC and become magnetic when heated.

Or something like that
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Old 05-04-2022, 01:56 PM   #1178
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@Ultramaroon



McMaster-Carr is considering discontinuing the print catalog. I work in our Strategy department and am researching the impact this would have on our customers. Would you mind taking a 5-minute survey to answer a few questions about if and how this would impact you?
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Old 05-04-2022, 03:11 PM   #1179
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When Assistant Director of Public Service fucking it up and he asked me to solve it... but he declines &/or not able for me to explain it to the staff why we're having certain trainings/programs, don't come complain to me. You did that shit to yourself. I gave you so damn many options (7 to be specific), you only accepted 1. ONE!!!!! I did my part and rest is up to you. I know shit ton of staff are sharpening their pitchforks.

Plus you gonna try out for the Director position? Highly doubt that's gonna go well... but who knows. Maybe he'll get that position. Cuz reg staff don't got any say on it. It's decided by Board Members. So if you kiss enough Board Members ass, it's possible get the Director's job.

/rant
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Old 05-04-2022, 03:34 PM   #1180
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@Ultramaroon



McMaster-Carr is considering discontinuing the print catalog. I work in our Strategy department and am researching the impact this would have on our customers. Would you mind taking a 5-minute survey to answer a few questions about if and how this would impact you?


Send me the link to the survey. "Doesn't impact me at all because you fuckers have always been too cheap to send me one."
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Old 05-04-2022, 03:37 PM   #1181
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Or something like that
No, that's pretty much it. Lots of pretty graphs and tables in my material science textbook but it all comes from experimental data - in other words, black magic.
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Old 05-04-2022, 04:15 PM   #1182
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I'm fascinated by the balancing act between hardness and toughness but I'm just a tourist. You're the real deal; a modern-day blacksmith.
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Like most things, I know enough to get me in trouble. Itchi knows some about this too making knifes.
Yeah, to certain degree, I do know small amount of metallurgy.

When I make a knife for customers or friends, I try to understand WHAT'S the purpose for this knife. Kitchen knife to cut stuff? Outdoor knife to chop branch/wood/etc? Combat knife to fight? EDC to carry around to cut paper or box? From there, thickness of the metal, grade of steel and angle of the bevel is decided. I'm still new at it, so I stay in high carbon steels like 1080~1095 (testing 5160 & 15N20 atm).

Steel like D2, O1, M4, Vanadis (?) or Z-series steels are unicorn steel to me. Stainless Steel like M398, CPM or even 440C is Mithril to me lol

With that said, if you want blade that you don't need to sharpen often and have same sharpness, would recommend SS. They're harder to get dull, BUT they're bitch to sharpen as well. If you truly want nice kitchen knife, go with high carbon steel. It require a lot of attention, but SS doesn't come near how sharp it can get.
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Old 05-04-2022, 04:41 PM   #1183
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Send me the link to the survey. "Doesn't impact me at all because you fuckers have always been too cheap to send me one."
Hope the link works.

https://mcmaster.az1.qualtrics.com/j...ImSo&jfefe=new

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Originally Posted by ichitaka05 View Post
Yeah, to certain degree, I do know small amount of metallurgy.

When I make a knife for customers or friends, I try to understand WHAT'S the purpose for this knife. Kitchen knife to cut stuff? Outdoor knife to chop branch/wood/etc? Combat knife to fight? EDC to carry around to cut paper or box? From there, thickness of the metal, grade of steel and angle of the bevel is decided. I'm still new at it, so I stay in high carbon steels like 1080~1095 (testing 5160 & 15N20 atm).

Steel like D2, O1, M4, Vanadis (?) or Z-series steels are unicorn steel to me. Stainless Steel like M398, CPM or even 440C is Mithril to me lol

With that said, if you want blade that you don't need to sharpen often and have same sharpness, would recommend SS. They're harder to get dull, BUT they're bitch to sharpen as well. If you truly want nice kitchen knife, go with high carbon steel. It require a lot of attention, but SS doesn't come near how sharp it can get.
Yeah, most other alloys I am not familiar and only know a little about, it is all similar in reading the phase diagrams but some require more specific quenching and tempering procedures. Some like 440C I think need a non reactive atmosphere or you start pulling impurities out of the air. I mostly deal with high carbon alloys like 5160 and 1095 which are pretty simple, the quenching window is just a bit narrow. 1525F is ideal, 1600F and above will cause it to quench crack, below 1500F you start to fall out of phase.

It's funny you call it a dark art @Ultramaroon. I was just talking to our GM about it a couple weeks ago about the "feel" to it and how we just can't through anyone back in the shop. It's not like we really use temp guns back there, if you know you know. Differentiating between the color when heated just comes with experience and wanting to know the happenings behind it.
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Old 05-04-2022, 04:44 PM   #1184
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Yeah, to certain degree, I do know small amount of metallurgy.
All just numbers in a catalog for me. Trace impurities to tweak it one way or another.

...online catalog because, oh yeah, fuck you too, Ryerson.
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Old 05-04-2022, 04:52 PM   #1185
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Yeah, most other alloys I am not familiar and only know a little about, it is all similar in reading the phase diagrams but some require more specific quenching and tempering procedures. Some like 440C I think need a non reactive atmosphere or you start pulling impurities out of the air. I mostly deal with high carbon alloys like 5160 and 1095 which are pretty simple, the quenching window is just a bit narrow. 1525F is ideal, 1600F and above will cause it to quench crack, below 1500F you start to fall out of phase.
Tamahagane steel, dying blade, etching & different materials for the handles and pins... add sub-zero or deep cryogenic treatment... whole Pandora box lol

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All just numbers in a catalog for me. Trace impurities to tweak it one way or another.
Yup same for me. That's why I try to keep my blade metal in easy & cheaper high carbon steels
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Old 05-04-2022, 04:52 PM   #1186
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Haha... nope. Oh well.

Quote:
Yeah, most other alloys I am not familiar and only know a little about, it is all similar in reading the phase diagrams but some require more specific quenching and tempering procedures. Some like 440C I think need a non reactive atmosphere or you start pulling impurities out of the air. I mostly deal with high carbon alloys like 5160 and 1095 which are pretty simple, the quenching window is just a bit narrow. 1525F is ideal, 1600F and above will cause it to quench crack, below 1500F you start to fall out of phase.

It's funny you call it a dark art @Ultramaroon. I was just talking to our GM about it a couple weeks ago about the "feel" to it and how we just can't through anyone back in the shop. It's not like we really use temp guns back there, if you know you know. Differentiating between the color when heated just comes with experience and wanting to know the happenings behind it.
That's what I'm talking about! Real expertise.
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Old 05-04-2022, 05:41 PM   #1187
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That's what I'm talking about! Real expertise.
Nah, I am just a dude that knows some things.
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Old 05-04-2022, 06:02 PM   #1188
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Nah, I am just a dude that knows some things.
Experts are just those that know enough to really know how much more they don't know.

I'll trust a humble person. I fear the hot-shot.
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Old 05-04-2022, 06:50 PM   #1189
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Experts are just those that know enough to really know how much more they don't know.

I'll trust a humble person. I fear the hot-shot.
I feel person attack here
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Old 05-04-2022, 07:00 PM   #1190
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I feel person attack here

Itís alright to be like that as long as you are willing to eat that not so great slice of humble pie when needed. I come in hot on some things too lol
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