Properties of rapid arc discharge plasma nitriding of AISI 420 …
Figure 2 (a) shows the XRD patterns of AISI 420 specimens nitrided at different temperatures. It can be seen that no precipitation of CrN phase was found in all specimens. The XRD patterns of the untreated specimen shows the standard α′ phase peaks (JCPDS file 44–1292). phase peaks (JCPDS file 44–1292).