Parameter Design in Carbonitriding of EN36, 16MnCr5, and AISI 4140 Steels Using Principal Component-Based Grey Incidence (PGI)

Figure 8

FESEM images showing diffusion depth in steel surface (a) EN36, (b) 16MnCr5, and (c) AISI 4140.

(a)

(b)

(c)