31CrMoV9 ring gear ultra-deep deep gas nitriding process
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Table 2 Process requirements for ring ring nitriding in 31CrMoV9 wind power speed increase box
Note: The above items are all in accordance with GB/T 11354-2005 steel parts nitriding layer depth measurement and metallographic examination.
Table 3 31CrMoV9 nitriding process test plan
Note: KN is the nitrogen potential value, and the nitrogen potential value is a parameter for characterizing the nitriding ability of the atmosphere, and has a corresponding relationship with the commonly used ammonia gas decomposition rate.
Figure 1 Metallographic organization of each process plan (500×)
Figure 2 Brittleness comparison of each process plan (100×)