Effect of Equal Channel Angular Pressing on the Surface Roughness of Solid State Recycled Aluminum Alloy 6061 Chips

Table 4

Quadratic models for , and .

Response		Equation
	1	1.334 − 0.00971A − 2.101B − 9.972C + 0.000036A^2 + 4.468B^2 + 120.55C^2 + 4.56BC
	2	1.191 − 0.00971A − 2.101B − 9.972C + 0.000036A^2 + 4.468B^2 + 120.55C^2+ 4.56BC
	3	1.153 − 0.00971A − 2.101B − 9.972C + 0.000036A^2 + 4.468B^2 + 120.55C^2 + 4.56BC
	4	1.130 − 0.00971A − 2.101B − 9.972C + 0.000036A^2 + 4.468B^2 + 120.55C^2 + 4.56BC
	1	7.04 − 0.01399A − 27.97B − 51.62C + 36.90B^2 + 496.6C^2 + 0.0771AB + 0.1211AC
	2	5.77 − 0.01399A − 27.97B − 51.62C + 36.90B^2 + 496.6C^2 + 0.0771AB + 0.1211AC
	3	5.57 − 0.01399A − 27.97B − 51.62C + 36.90B^2 + 496.6C^2 + 0.0771AB + 0.1211AC
	4	5.45 − 0.01399A − 27.97B − 51.62C + 36.90B^2 + 496.6C^2 + 0.0771AB + 0.1211AC