“…For three-stage superplastic forming, pressure was varied from 0.1 MPa to 0.8 MPa and for each pressure, superplastic forming experiments were conducted at (5,8,9,10,12,15,18,20,25,27,29 and 30) mm of bulge height to predict the optimum pressure required for uniform thickness distribution. For each bulge height, individual components were formed and the parameters of pole thickness, thickness distribution, relative bulge height, relative bulge radius, forming time, average thickness and thinning factor were determined.…”