Improvement of Surface Properties of Inconel718 by HVOF Coating with WC-Metal Powder and by Laser Heat Treatment of the Coating

Table 2

Coating processes prepared by Taguchi program and OCP of the highest surface hardness.

Process	Oxygen; FR	Hydrogen; FR	Feed; rate	Spray; distance (in)	Hardness; (Hv)
1	30	53	25	6	973
2	30	57	30	7	943
3	30	61	35	8	913
4	34	53	35	7	976
5	34	57	25	8	942
6	34	61	30	6	930
7	38	53	30	8	1033
8	38	57	35	6	960
9	38	61	25	7	998
OCP	38	53	25	7	1150

FR: flow rate (FMR = 12 scfh = 9.44 10⁻⁵ m³/s), feed rate: g/min, and OCP: optimal coating process.