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How do you increase Vickers on B50TF56CLA METCO 450 |
Posted by: gejohn - 01-24-2007, 09:05 PM - Forum: Surface Engineering Threads
- Replies (10)
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Hello, hope all is well.
We are spraying Ni-Al (Metco 450) as a bond coat via 9MB plasma gun. The top coat is then applied, B50TF222 CLA METCO 601NS (Al Polyester).
Our standard practice manual requires a Vickers Hardness test (120 HV 0.3 minimum) on the bond coat. We have consistently been failing the metlab test with a Vickers hardness value on the bond coat of about 105-110 HV.
Is there a way to increase the hardness without interfering with the metallographic testing requirments (oxides, laminations...etc.). I am in the process of testing various coupons at various settings, but hopefully your answer will save me some time (and money). We are spraying Inconel 718. Thank you.
John
BOND COAT TOP COAT:
Gun 9MB 9MB
Nozzle GH GP
Powder Port 2 2
Powder Shaft A A
Powder Feed Rate 5 3.2-3.5
Carrier Gas Flow 13 24
Vibrator 10-15 10-15
Air Jet Pressure 30-40 70-80
Air Jet Position PARALLEL PARALLEL
Spray Distance 4 3.5-4
Spray Angle 90 90
Table RPM 100 100
Table Angle A/R A/R
Voltage (Ref.) 63-73 63-73
Amperage 500 500
Pri Gas ARGON PSI 75 75
ARGON FLOW 80 190
Secondary Gas
HYDROGEN PSI 50 50
HYDROGEN FLOW 20 5
Thickness .002 - .005? Total wall & coating thickness = 0.25?
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carburizing |
Posted by: melrose - 01-19-2007, 11:51 AM - Forum: Surface Engineering Threads
- Replies (1)
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Hi,
I have another problem with carburizing, I know that carburizing diffuses carbon atoms to the surface of the steel to increase it's hardness. However, I have no idea how carburizing can improve the fatigue resistance of the steel. Are there any correlation with hardness and fatigue resistance?
Thanks!
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What is the Correct Test Method for Case Hardened Steel |
Posted by: dunlaw - 01-18-2007, 12:33 PM - Forum: Surface Engineering Threads
- Replies (7)
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We manufacture rollers from AISA6820 steel with a hardness of 28HRC.
These are machined then further hardened by nitriding to a desired 56 HRC.
The depth of Nitrided material is about 0.4mm.
When we test the rolls with our Rockwell machine (Using B and C) we are only obtaining a hardness of 28 i.e. the core material.
Our supplier tells us that the depth of hard material at 0.4mm is too thin and that they test with a "non invasive" method obtaining the correct 56.
I have my doubts as some of the rolls are breaking up on the surface.
Is Rockwell C a suitable method for testing a 0.4mm case hardened surface?
Thanks in advance.
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[split] Abradable coatings |
Posted by: Madila Awalini - 01-10-2007, 07:19 AM - Forum: Surface Engineering Threads
- Replies (2)
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Hi Gordon,
Just read your reply today.
I hope you don't mind my continuing the discussion on the abradable coatings.
I want to ask you the possible causes of getting inconsistent hardness values from time to time.
I mean what critical factor can give significant contribution to this inconsistency.
We spray the specimens of Ni 75 - Graphite 25 coating as an abradable layer for compressor rotor of aircraft engine.
Although we always obtain hardness values within the range as recommended by the OEM and/or the material manufacturer (i.e. 30 - 50 HR15Y ) , there is still an inconsistency in the test results.
Sometimes they are all above 40 HR15Y , but lately they are all in the lower range i.e. 30 - 40 HR15Y only.
This makes us difficult to release the test result as the representative of the sprayed part, in a way that we would only find out the actual quality of our thermal spray process result after the part is installed and tested as a complete engine.
If the part has not released with top quality, we are afraid it will abrade easily and during engine testing (high pressure, high temperature) will affect other parts which are very costly.
Hope you or others can help me again this time and share the knowledge.
Thank you.
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