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

Table 4

Normalized principal components and DPI values.

Trial	Principal components			Normalized principal components			Grey incidence coefficient			DPI
	HV	DD	WL	HV	DD	WL	HV	DD	WL
1	0.701	0.380	−0.106	0.000	1.000	0.247	0.333	1.000	0.399	0.495
2	1.229	−0.026	0.212	0.307	0.577	0.450	0.419	0.541	0.476	0.454
3	1.362	−0.065	0.105	0.385	0.537	0.381	0.448	0.519	0.447	0.464
4	1.021	−0.205	1.076	0.186	0.390	1.000	0.380	0.451	1.000	0.476
5	2.077	−0.418	−0.040	0.800	0.168	0.289	0.715	0.375	0.413	0.598
6	1.721	−0.292	0.178	0.593	0.299	0.428	0.552	0.416	0.466	0.510
7	1.213	0.003	0.153	0.298	0.607	0.412	0.416	0.560	0.460	0.455
8	2.420	−0.456	−0.494	1.000	0.129	0.000	1.000	0.365	0.333	0.769
9	1.933	−0.278	−0.210	0.716	0.314	0.181	0.638	0.422	0.379	0.555
10	1.428	−0.228	0.472	0.423	0.367	0.615	0.464	0.441	0.565	0.472
11	1.230	−0.061	0.312	0.308	0.540	0.513	0.419	0.521	0.507	0.454
12	2.058	−0.580	0.463	0.789	0.000	0.609	0.704	0.333	0.561	0.600
13	1.269	−0.230	0.742	0.330	0.364	0.787	0.427	0.440	0.701	0.466
14	1.769	−0.157	−0.296	0.621	0.441	0.126	0.569	0.472	0.364	0.520
15	1.091	−0.079	0.593	0.227	0.522	0.692	0.393	0.511	0.619	0.449
16	1.270	−0.138	0.470	0.331	0.460	0.614	0.428	0.481	0.564	0.457
17	1.760	−0.380	0.371	0.616	0.208	0.551	0.565	0.387	0.527	0.520
18	2.195	−0.439	−0.174	0.869	0.147	0.204	0.793	0.369	0.386	0.643