tailieunhanh - The microstructural characteristics in a superalloy hybrid component fabricated by friction process

The dissimilar superalloy joint between Inconel 718 and Mar-M247 was fabricated by friction welding process. The microstructure in and around the welding was investigated by the Scanning Electron Microscope (SEM) and Energy-dispersive X-ray spectroscopy (EDS). The welding was found to be free of defect and the welded zone was quite narrow. The diffused zone between the two base metals was tine. | Journal of Science and Technology 55 (2) (2017) 244-249 DOI: THE MICROSTRUCTURAL CHARACTERISTICS IN A SUPERALLOY HYBRID COMPONENT FABRICATED BY FRICTION PROCESS Tran Hung Tra1, *, Atsushi Sano2 1 2 Nha Trang University, 02 Nguyen Dinh Chieu St., Nha Trang City,Vietnam Nagaoka University of Technology, Kamitomioka-Machi 1603-1, Niigata, Japan, 940-2188 * Email: tra@ Received: 7 May 2016; Accepted for publication: 9 January 2017 ABSTRACT The dissimilar superalloy joint between Inconel 718 and Mar-M247 was fabricated by friction welding process. The microstructure in and around the welding was investigated by the Scanning Electron Microscope (SEM) and Energy-dispersive X-ray spectroscopy (EDS). The welding was found to be free of defect and the welded zone was quite narrow. The diffused zone between the two base metals was tine. The microstructure in the welded zone was recrystallized significantly and revealed a very complicated morphology and characteristics in Inconel 718 side. Inconel 718 and Mar-M247 could be joined successfully by the friction welding process. Keywords: dissimilar friction welding, superalloys, microstructure characteristics. 1. INTRODUCTION Inconel 718 and Mar-M247 are the superalloys suitable for high temperature applications [1]. The joining of these two superalloys is expected to produce the hybrid components possessing excellent strength. The aim to join these dissimilar alloys is addressed to fabricate the “blisk” in gas turbines. Friction welding is an attractive method for dissimilar joining metals with high γ’ volume fraction such as Nickel based superalloys that considered to be unweldable by other welding methods [2 - 5]. One of the most advantages of friction welding is that the joints can be archived at a temperature below the melting point and thus this technique can join all metals including MMCs (metal matrix composites). In engineering, the welding of dissimilar metals is .