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

Table 3

Preprocessed data.

Trial	S/N ratio			Normalized S/N ratio
	HV	DD	WL	HV	DD	WL
1	56.035	37.745	37.760	0.266	0.000	0.341
2	56.157	39.268	38.145	0.347	0.415	0.411
3	56.278	39.405	37.393	0.427	0.452	0.273
4	55.635	39.979	38.230	0.000	0.608	0.427
5	56.720	40.705	38.358	0.721	0.806	0.450
6	56.430	40.252	37.965	0.528	0.682	0.378
7	56.178	39.158	38.786	0.360	0.385	0.529
8	57.141	40.866	40.685	1.000	0.850	0.878
9	56.726	40.178	39.642	0.725	0.662	0.686
10	56.137	40.029	35.907	0.333	0.622	0.000
11	56.110	39.403	37.052	0.315	0.451	0.210
12	56.469	41.418	38.244	0.554	1.000	0.430
13	55.924	40.054	37.523	0.192	0.629	0.297
14	56.682	39.722	36.688	0.695	0.538	0.144
15	55.904	39.486	38.800	0.178	0.474	0.532
16	56.055	39.696	36.227	0.279	0.531	0.059
17	56.358	40.588	37.316	0.480	0.774	0.259
18	56.846	40.775	41.349	0.804	0.825	1.000