Development of Alloy 718 Nozzle for Ramjet Propulsion Component

Park, Nho-Kwang; Kim, Jeoung-Han; Kim, Nam-Yong; Lee, Chae-Hoon; Yeom, Jong-Taek; Hong, Jae-Keun; Baek, Dong-Kyu; Choi, Sung-Gyu

Journal of the Korea Institute of Military Science and Technology 2008;11(4):76-82.

Nho-Kwang Park, Jeoung-Han Kim, Nam-Yong Kim, Chae-Hoon Lee, Jong-Taek Yeom, Jae-Keun Hong, Dong-Kyu Baek, Sung-Gyu Choi

¹Korea Institute of Materials Science
²KSP

Ramjet 고속 추진체용 Alloy 718 합금 노즐 단조품 개발

박노광, 김정한, 김남용, 이채훈, 염종택, 홍재근, 백동규, 최성규

¹재료연구소
²(주)케이에스피

Abstract

Alloy 718 nozzle component was manufactured by hot forging and electron beam welding process. In this process, 718 billets produced in domestic company were used and evaluated. Before performing industrial scale hot forging, small size hot compression tests were carried out under various process conditions and then microstructural evaluations were analyzed. Using the results, FEM simulations were performed in order to optimize the hot working process. After hot working, forged work-pieces were machined and welded by electron beam. Final nozzle components were heat treated and their microstructure and mechanical properties were investigated.

Key Words: Alloy 718, Nozzle, Ramjet Propulsion, Hot Forging, Electron Beam Welding