@mfgenggear
Hello again :)
Our compound layer thickness is really thin already so we dont want to change the process type, (yet) (We get an avg 5 microns compound layer)
The case depth isn't a problem. (dont know where you see that being an issue :) )
I have researched alot and we have come...
More info. From what it looks under the microscope (500x) there is a fine compound layer all the way through the "black" spots where the unknown layer has fallen of. My 1000x microscope isn't working at the moment, so its hard to tell under 500x, but it looks like there might be a really fine...
As you can see in the bottom it looks like the compound layer is just laying on top, ready to fall of with a touch of a feather
@Metengr
I am aware of different techniques to reduce the compound layer, this is not our which as some of our costumers want the aesthetic from the pure "grey ish"...
Hello.
Sorry for the late reply, i have been away from my pc the last 2 weeks :)
@WKTayler
Precleaning is the same as we do on any of our treatments, Nothing differs from treatment to treatment, it just appears out of no where.
Geometry is random, the treatment consisted of 10 different type...
Hello !
Where i work we have an issue i been involved in (It has been seen maybe 5 times over the last 5 year)
We do a pretty standard gas nitriding process at 520 degrees celcius with NH3.
We pre oxidize the parts at 400 degrees before nitriding the parts.
For some reason after treatment, it...
Hello Haz88.
I have been working at a heat treat facility for close to 2 years now (my knowledge is sparsome but i learned a thing or two:) )
I worked alot with the proces, gas nitriding, which is resultwise similar to a QPQ process (though thats in a salt bath)
A little theory is handy here...
An update to this!.
The bulb was faulty, there was nothing to see on the bulb visually but another one made the "scratches" go away. We also found that some of the dark spot was spots on one of the deep internal lenses, we have been able to clean it a bit but some of the spots are almost burned...
@Redpicker, i would asume that too. but it has been working fine for a whole month and i had it dialed in when replaced. Thats why im questioning it is the bulb ?
@IRstuff, Im not so familiar with dark field microscopy but i dont think it is ? i just had the light turned down a bit to make the...
@ Yirmidokuz. We havent changed anything in the room according to ceiling lights so i highly doubt it. But i will try to block the occulars and see if it has any effect.
@IRstuff. Yes i was trying to catch the best picture of the "flaw" but even when i turn up the light its still there. We have...
Hello !
This is not about materials, but hopefully some of you have seen this before when looking into microscopes.
Here where I am an intern we have an old Carl Zeiss Jena microscope that im using regularly.
Out of nowhere, yesterday, some dark shades appeared over the screen. I have tried to...
@Lyrl. Ah yes ! sounds like the best option. Might have been my "poor" english since i didnt catch that in the first try :)
@Redpicker, thanks alot for going into details, its nice since im brand new in the branch and as said, "just" an intern.
I will check up on what we are using and make the...
Just to let you all know. The costumer had a meeting with my supervisor and the costumer silently admitted there might be a slight chance in the way they do their machining.
But like we suspected they wont let us in on what difference.
The case is closed until we recieve their next shipment. If...
@Maui I will check up on that
@Swall. awesome! i was hopeing someone had this issue before, we just have to push through to our costumer and hope they will let us in on their procedures to see if they are using different coolants or machining techniques.
@Mfgenggear. But how do you handle...
@mfgengear. We have full control over the process and the sensors are calibrated monthly. We have had our in house metallurical consultant in over to get help, but with no luck. He hasn’t seen this issue before.
@Maui. Exactly what im thinking. I cant help to think that there must be difference...
@mfgenggear
I have done a spectra analysis and it is AISI 5120.
I will try and see if our costumer will supply a machined part we can try it on.
But im still confused why its not happening to the other diameter parts in the same material.
Im thinking it must be the machining of that...
@mfgenggear
Can you please explain ?
Im familiar with oxides, but i cant see how the oxide only appears after machining, and especially on certain diameter axel.
Hello all!
Im an intern at a heat treatment facility as a mechanical engineer. (non english speaking so sorry for typo-o's :)
I have a task which is causing alot of trouble in our case hardening department.
A costumer is producing different sizes axels in 20MnCr5.
When one certan size axel is...
