Optimization of Forging Process Parameters and Prediction Model of Residual Stress of Ti-6Al-4V Alloy

Table 6

Regression analysis of sample data (990°C–1025°C).

Sample	T	D	S	σ (MPa)
1	990	40	100	10.2
2	990	50	300	10.7
3	990	60	500	10.6
4	990	40	300	10.4
5	990	40	1000	9.61
6	990	50	500	10.8
7	1000	40	300	9.63
8	1000	60	1000	9.79
9	1000	70	500	10.6
10	1000	40	1000	9.04
11	1000	70	100	11
12	1010	40	500	8.82
13	1010	40	300	8.99
14	1010	60	100	9.5
15	1010	70	300	10
16	1010	50	500	9.3
17	1010	60	300	9.33
18	1025	60	300	8.35
19	1025	70	100	9.19
20	1025	60	100	8.83
21	1025	70	500	9.2
22	1025	40	100	8.2
23	1025	50	100	8.93
24	1025	50	300	8.3
25	1025	40	500	8.1