We nitride 15-5PH stainless steel for aircraft landing gear at 405 degrees for 70 hours to get a case depth of 40 microns. We have noticed on testing that we get spallation and wear of the case. We tested a component with a 20 micron case under the same conditions and it performed much better (almost no wear). Could someone provide an explanation of this effect?
Dear Sam,
At first glance, the differences between the wear performance of two nitrided surfaces could be attributed to their phase structure (i.e. presence and size of CrN precipitates). Coarser CrN precipitates could play a crucial role in spalling. But, you should provide much more details about the second nitriding process, and also more information about the structure of two nitrided surfaces should be given.
Regards,
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