A Study on Solid Nitriding of Hot Work Tool Steel
Date Issued
2009
Date
2009
Author(s)
Yu, He-Yan
Abstract
In this research, solid powder nitriding treatments were applied on JAC1 hot work tool steel under different conditions (temperature, time, atmosphere surrounding the powder, nitriding method, supplement of catalyst CeO2, etc.). By observing the microstructure, measuring the hardness of the surface layer, analyzing chemical compositions and conducting X-ray diffraction experiments, the effects of solid nitriding conditions on the nitriding results of the steel were studied. Experimental results show that there were no significant effects on the hardness of the surface layer and effective hardening depth of the steel subjected to solid nitriding, with changing the atmosphere surrounding the powder (air, nitrogen, oxygen or vacuum) and treatment methods (nitriding once or twice, nitriding with one or two sections). Adding an appropriate amount of rare earth element oxide (CeO2) in nitriding powder could increase the nitriding effect significantly. Under the same nitriding temperature (540ºC) and time (12hr), the highest surface layer hardness could be promoted to approximately 24%, and the effective hardening depth could be increased to 60%.
Subjects
hot work tool steel
solid nitriding
effective case depth
rare earth element
catalyst
Type
thesis
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