Dissimilar Rotary Friction Welding of Inconel 718 to F22 Using Inconel 625 Interlayer

Abstract

Dissimilar metal joining has always been a challenging task because of the metallurgical incompatibility and difference in melting points of alloys being joined. Diffusion and mixing of alloying elements from dissimilar base metals at the weld often cause unwanted metallurgical changes resulting in unsuccessful welds or underperformance of the weldment. Solid-state dissimilar friction welds of Inconel 718 and F22 were prepared in this study with an Inconel 625 interlayer to address the carbon enrichment of Inconel 718 during the welding. Defect-free rotary friction welds were produced in this study. Microstructural and mechanical properties investigation of the weldments and base metals was carried out, and results were analysed. Intermixing zone was observed at the weld interface due to the softening of the metal at the interface and rotatory motion during the welding. The high temperatures and the plastic deformation of the intermixing zone and thermo-mechanically affected zone (TMAZ) resulted in the grain refinement of the weld region. The highest hardness was observed at the Inconel 718/F22 weld interface due to the plastic strain and the carbon diffusion. The tensile specimens failed in the F22 base metal for the weld prepared with and without the Inconel 625 interlayer. Inconel 718/F22 welds exhibited lower toughness values compared to the Inconel 718/F22 welds prepared with Inconel 625 interlayer.

The effect of TIG welding on the structure and hardness of butt joints made of Inconel 718

“…Nowadays in many branches of industry that can be regarded as critic for national or global economy there is a strong need for new technologies and materials. Production of electric energy [ 1 , 2 ], off-shore and marine industry and engineering [ 3 , 4 ] nuclear industry [ 5 ] also in applications connected with green production and environment protection a vast of areas where are harsh conditions including corrosive environments, where the most dangerous is gas corrosion in elevated temperatures of operation [ [6] , [7] , [8] , [9] , [10] ]. Possibility to operate in conditions where there is a high amount of heat in the surrounding environment [ 11 , 12 ], significant resistance for creeping (mainly in high temperatures over 1000 °C) [ [13] , [14] ] are only some of requirements.…”

Microstructure and Mechanical Properties of Solid-State Rotary Friction Welded Inconel 713C and 32CrMo4 Steel Joints Used in a Turbocharger Rotor

“…Nickel alloys in both categories can be welded using common processes [ 33 ]. Rehman et al [ 34 ] investigated the mechanical properties and microstructure of Inconel 718-F22 RFW joints. The results revealed that the higher hardness was observed at the weld interface of the Inconel 718/2.5Cr-1Mo (F22) steel RFWed joints compared with the RFWed joints with an Inconel 625 interlayer.…”

Influence of Microstructure and Mechanical Properties of Dissimilar Rotary Friction Welded Inconel to Stainless Steel Joints

“…This may be attributed to the strain hardening of the FDZ of Inconel 718 in AISI 316L/IN 718 ST, which is higher compared to the AISI 316L/IN 718 STA condition. IN 718 ST softened at a temperature lower than IN 718 STA, resulting in severe plastic deformation[36].Due to the peak temperatures and high strain energy encountered by the FDZ of IN…”