Revista de Ciências e Engenharia de Materiais

Study on the Spinning Forming Process of a Bowl-Shaped Part with Hastelloy X Raw Material

Abstract

M. GHadimi Dafrazi, B. Barooghi Bonab, and M. Mahdi Bali

One of the basic needs in the defense industry is the manufacturing of thin-slice and high-plasticity pieces, but thin-slice pieces with complex geometric shapes can often not be manufactured by conventional ways or cost more than conventional ones. Usually, the method of manufacturing these pieces is to use the spinning. In addition to quality and precision in size, these pieces must be of high strength, which makes them difficult to manufacture. In this study, spinning with thermal methods in High Temperature Furnace was used to form a bowl. The Hastelloy x alloy was used for fabrication. All tensile, hardness and microstructure tests were performed on the formed part by optical microscopy after forming and heating processes. After completing the process of manufacturing, the quality of its dimensions were also measured by a 3D optical scanner. The Hastelloy x alloy loses its plasticity after 45% cold-working, which significantly reduces elongation and increases hardness. The furnace at 1177°C was used to increase the workability. The use of the furnace results in full recrystallization of the microstructure, reducing the hardness by 62 percent, increasing by 6 times the elongation, and by 40 percent the yield stress, which provides the conditions for further cold work. Experimental examination of surface quality using optical scanners shows that the average thickness distribution obtained for this experiment is 0.13. This value represents only a difference of less than 15% with the value obtained by software 0.15, indicating that the dimension produced is in good agreement with the sample.