Effect of deposition layer on microstructure of Ti–Al bimetallic structures fabricated by wire and arc additive manufacturing

Abstract

Ti-Al bimetallic components present extensive application prospects and have attracted considerable attention owing to their low cost and light weight. In this study, Ti-Al bimetallic structures with one, two, and five Al layers were fabricated via wire and arc additive manufacturing by cold metal transfer welding. During the deposition process of the first Al layer, the matrix was TiAl, and a needle-shaped Ti 3 Al was formed. Subsequently, from the second deposition layer of the Al alloy, however, TiAl 3 was formed, and it exhibited an exceptional morphology with two types of structures: coarse columnar grain structures with identical growth orientation, and long striplike structures with a random distribution. The formation order of Ti-Al intermetallic compounds was TiAl 3 , TiAl, and Ti 3 Al.

Pitting corrosion studies on functionally graded Inconel 825-SS316L wall manufactured by wire arc additive manufacturing

“…According to several recent studies [34][35][36][37][38][39][40] on functionally graded materials/bi-metallic structure, the microstructure is composed of elongated and equi-axed dendrites with secondary arms and precipitates. The dendritic microstructure plays a vital role for the enhancement of corrosion resistance.…”

Ta/Cu transition region in TC4/Inconel718 bimetallic structure fabricated by laser deposition manufacturing

“…The bimetallic structure can make full use of the excellent properties of the two materials and has broad potential applications in the aerospace, biomedicine, oil & gas, power generation, and nuclear industry. It can meet the needs in these fields, such as high-performance, lightweight, high thermal/electrical conductivity, high wear resistance and corrosion, and multifunctional parts [3][4][5][6].…”

Optimisation of precipitation hardening for 15-5 PH martensitic stainless steel produced by wire arc directed energy deposition

“…Gas metal arc-based AM is one of the most productive AM solutions in WAAM [8] Generally, any welding filler wire may be used for WAAM, such as structural steels [9], stainless steels [10], aluminium alloys [11], titanium [12], and others. One of the most promising candidates for WAAM are precipitation hardening (PH) stainless steels as they can provide a good combination of strength and corrosion resistance [7].…”