Phase formation in selected surface-roughened plasma-nitrided 304 austenite stainless steel

Figures & data

Figure 1 X-ray diffractogram of as-prepared AISI 304 stainless steel samples.

Figure 2 X-ray diffractogram of AISI 304 stainless steel samples after plasma nitriding.

Surface roughnesses (R_a) and lattice spacings (d) of untreated and plasma nitrided AISI 304 austenite stainless steel samples.

			d-values (nm)
Sample	Ra(μm)	γ111	γ200	γ200	γ 322	α110
Untreated
S1	0.05	0.20865	0.18186	0.12744	0.10890	0.20505
S2	0.475	0.20819	0.18085	0.12643	0.10833	0.20462
S3	1.020	0.20774	0.17952	0.12600	0.10770	–
After plasma nitriding
S1	1.320	0.20774	0.18052	0.12713	0.10833	0.20374
S2	1.100	0.20828	0.18078	0.12744	0.10862	0.20374
S3	1.950	0.20817	0.17985	0.12743	0.10881	0.20331

Figure 3 Surface hardness as function of case depths of (a) S1, (b) S2 and (c) S3.

Figure 4 Optical micrograph of case depths of (a) S1, (b) S2 and (c) S3 after plasma nitriding.