Czasopismo | INŻYNIERIA MATERIAŁOWA | Rocznik 2016 - zeszyt 6

Characterization of microstructure and mechanical properties of electron beam welded Allvac 718Plus butt welded joint

10.15199/28.2016.6.3

nr katalogowy: 103153
10.15199/28.2016.6.3

Allvac 718Plus (718Plus) is a high strength, corrosion resistant commercial polycrystalline nickel-based superalloy developed by ATI ALLVAC over 10 years ago. 718Plus has been designed to fuse the most desired properties of Inconel 718 and Waspaloy, producing advantages of good mechanical properties, higher working temperature than Inconel 718, good fabricability and reasonable cost of production. 718Plus is strengthened by γʹ phase and other precipitates which are located mainly at grains boundaries. Compared to Inconel 718, 718Plus has increased concentration of Al, Ti and Co and decreased amount of Fe. Weldability of 718Plus is comparable to Inconel 718, thus there is a risk of intergranular microcracking in heat affected zone (HAZ). The test joint have been welded autogenously using electron beam at 120 kV accelerating voltage, 10 mA current and 78 cm/min welding speed. The microstructure of casted base material, heat affected zone (HAZ) and weld metal of electron beam welded 718Plus were investigated by means of light (LM) and scanning electron microscopy (SEM). SEM observations of welded joint microstructure were performed using secondary electrons (SEM-SE). SEM/EDS analysis were carried out. Both MC type carbides and Laves phase were observed in interdendritic regions of base material. The microstructure of heat affected zone was composed of γ matrix, γʹ phase and MC-type carbides, Laves phase and Laves/γ eutectic. In weld metal zone no γʹ precipitates were observed. The microhardness measurements have shown a decrease in weld metal and HAZ. It can be caused by an influence of the welding process thermal cycle. Key words: 718Plus, electron beam welding, SEM.1. INTRODUCTION Allvac 718Plus (718Plus) is a relatively recently developed nickelbased superalloy which properties lead to widespread potential of applications. This alloy belongs to a group of nickel-base superalloys strengthened by ordered[...]

Bibliografia

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