Cryogenic Society of America defines the “cryogenic temperatures“ as temperatures below - 140°C.
Goal of this process is to proceed with martensitic transformation by decreasing the temperature and by so reducing the amount of retained austenite.
Alper Heat Treatment can carry out this process with full control and excellent precisionin microprocessor operated cryogenic chambers.
Effectsof CryogenicProcess
• Retained austenite transforms into martensite
• Very fine η-carbides(etacarbide) precipitate on the martensitic matrix uniformly
• Arranges hardness range/distrubition
• Relieves internal stresses/residual stresses
• Increases toughness, wear resistance and fatigue strength
|
STEELS |
DIN 1.2080 |
DIN 1.2379 |
DIN 1.2436 |
|
HARDNESS AFTER QUENCH |
64 HRC |
63 HRC |
64 HRC |
|
STRESS RELIEVED (150°C) |
62HRC |
61-62 HRC |
62-63 HRC |
|
CRYOGENIC PROCESS (-150°C / 12 Hours) |
66-67 HRC |
63-64 HRC |
65-66 HRC |
Increase of Wear Life in Cryogenic Treated Steels.
|
STEEL
|
WearResistance(Rw*)
|
|
No Process
|
Sub-ZeroTreat.
|
CryogenicTreat.
|
|
52100
|
25.2
|
49.3
|
135
|
|
D2 (1.2379)
|
224
|
308
|
878
|
|
A2 (1.2363)
|
85.6
|
174.9
|
565
|
|
M2 (1.3343)
|
1961
|
2308
|
3993
|
|
O1 (1.2510)
|
237
|
382
|
996
|
A standart cryogenic process cycle:
a: time to reach process temperature from room temperature.
b: holding time at process temperature
c: time to reach room temperature
d: temperin temperature
Alper Heat Treatment can carry out this process with full control and excellent precision in microprocessor operated cryogenic chambers which are also manufactured by Alper.
