Microstructure and mechanical properties of electron beam welded dissimilar steel to Fe–Al alloy joints

Abstract

Electron beam welding (EBW) technique was used to perform dissimilar joining of plain carbon steel to Fe-7%Al alloy under three different weld conditions such as with beam oscillation, without beam oscillation and at higher welding speed. The effect of weld parameters on the microstructure and mechanical properties of dissimilar joints was studied using optical microscopy, SEM, EBSD, hardness, tensile and erichsen cup tests.

Understanding novel gap-bridged remote laser welded (RLW) joints for automotive high-rate and temperature applications

“…In general, columnar grain growth was observed from the fusion boundary (i.e. transition from BM to FZ) towards the centre of the fusion zone [52]. Figure 6(e) shows the transition from the base material to the fusion zone where the elongated grains are visible.…”

“…Therefore, the main strength is coming from the precipitate growth under controlled heating (ageing) to the desired temper state. 8(a) that there is some fluctuation in microhardness values within the FZ which can be attributed to (i) variation during the welding process where it was difficult to obtain a homogeneous mixture, and (ii) grain size distribution, grain orientation, and crystallographic direction [52,54] as a result of directional cooling.…”

Dissimilar joining of Titanium alloy to Aluminium using Al-Si based filler alloy by vacuum brazing technique

“…Researchers have tried brazing commercially available pure Titanium and its alloys at various temperatures with Ti-Cu-Ni and Al base filler alloys with various types of brazing [1][2][3][4] and studied the joint interface structures. Also, power beam welding processes like laser beam welding and electron beam welding with beam offset [5][6][7][8][9][10] using various heat input conditions were experimented with to control the formation of intermetallics at the interface. Other methods investigated were friction stir welding [11][12] , electron beam welding 13 , diffusion bonding method 14,15 and laser welding 16,17,18 process.…”

Neutron diffraction bulk texture study with impact property correlation of electron beam welded dissimilar Fe-7%Al alloy to steel joints

“…Dissimilar metals combination like Fe-7% Al alloy to mild steel is gaining importance in different sectors especially in aerospace and automotive sectors because of light-weighting as it decreases fuel consumption and to reduce greenhouse CO2 emissions [3]. Aluminium addition to steel, effectively reduces its density like here only 7-8% aluminium to steel reduces approximately 17% its density [4]. Electron beam welding (EBW) is a special type of fusion state joining process which justified by low heat input, higher power density, high penetration and high depth to width ratio and fewer defects in the joints [5,6].…”