How hard can it be? Part III (this is a really hard case!)
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- Опубліковано 3 лис 2022
- Third and final part of the series on measuring the hardness of steel with a homemade hardness tester. I do some case hardening tests. The result is a simple graph which, in my opinion,
could be useful to many interested in this topic: Select the desired temperature and duration, and read an estimate of the depth of the curable layer.
Music: Beethoven 9th symphony, finale.
Source: No Copyright Music. - Наука та технологія
Two mistakes:
At 15:00 I made a mistake and used a Dutch subtitle.
"Met behulp van twee eindmaatjes klem ik"
should be:
"Using two gauge blocks I clamp"
Second mistake:
In the video: at 14:50 I show the quenching of the sample before milling it. Of course this occurred after milling the slope.
Sorry!
Interesting experiment & results Michel, Congrats!!
Great work!
Awesome to see a detailed walk-through. I'm amazed you can get it to 67HRC with case hardened carburised mild steel at home.
It surprised me a bit also. Thought I could reach 63-64 or so.
Superb video - and if you don`t like Beethoven (I do!), you can always watch without sound. What kind of oven are you using?
I bought this electrical melting oven from aliexpress 2 years ago for € 167. They are still for sale there at this price (but I see the exact same ovens elsewhere for € 475,-). The interior space is of course very small (max 6 by 15 cm). But the 'intelligent' temperature control is very accurate and even after 5 hours at 960 degrees, the oven is not extremely hot on the outside. In some ovens the paint peels off with longer use, but not with this one. The maximum temperature is 1150 degrees, which is enough to melt gold, silver and copper. However, it is wise not to maintain this very high temperature for more than half an hour. Keep an eye on; the same oven is sold for double or even triple price in a number of countries, don't fall for that, it is not a better model. All of these ovens come from China, but some are just trying to make a shameful profit from them.
Very interesting! Can CO emissions from the furnace reach unhealthy levels, or is the lid tight enough to prevent any leakage? What brand is your furnace, and what to look for when buying one?
In that little furnace of mine, CO released is not a concern. It will never really be much, and the lid seals pretty well.
I bought this 3 kg oven from aliexpress 2 years ago for € 167. They are still for sale there at this price (but I see the exact same ovens elsewhere for € 475,-). The interior space is of course very small (max 6 by 15 cm). But the 'intelligent' temperature control is very accurate and even after 5 hours at 960 degrees, the oven is not extremely hot on the outside. In some ovens the paint peels off with longer use, but not with this one. The maximum temperature is 1150 degrees, which is enough to melt gold, silver and copper. However, it is wise not to maintain this very high temperature for more than half an hour. Keep an eye on; the same oven is sold for double or even triple price in a number of countries, don't fall for that, it is not a better model. All of these ovens come from China, but some are just trying to make a shameful profit from them.
What about nitriding steel while carbonizing it?
You mean nitrocaburizing. That is a process that an amateur should not embark on, because very toxic salts are involved. Gas nitriding (i.e. only allowing nitrogen to diffuse) is less dangerous, but also not a harmless process because ammonia (NH3) is used. Besides the fact that ammonia is unhealthy, the hydrogen gas released is very flammable, and in unfavorable conditions even explosive.
PLEASE speak the words you have so carefully placed at the bottom of your videos.
If you all understood Dutch, I would have loved to do so. In my later videos I got help from Brian, an A.I. voice.