Abstract
Wire arc additive manufacturing (WAAM) is vigorously explicating direction of mechanical engineering. When using submerged arc welding (SAW) it is possible to apply low-alloy steels with high efficiency and properties, that will allow to use it for manufacture of details and instrument. Microstructure, hardness, distribution of nonmetallic and chemical composition were investigated for SAW build up walls, in as-deposited condition, by low-alloy wire under fluxes with a different basicity. The characteristics of microstructure fixed by an optical microscopic metallography remain practically constant for all deposited weld metals. It is ferrite – martensite (bainite) structure, which has a high dispersibility. The exploration of hardness has shown formation of the partially quenched top with increased hardness and previous thermo- cyclic treated passes with lower hardness. When depositing SAW insignificant saturation of metal with silicium and manganese and a carbon drop occurs. The distribution of nonmetallics is most favorable for additive manufactured material under neutral and basic fluxes. As a result, a comparative research of fluxes was conducted, allowing to make a choice for additive manufacturing of low-alloy work pieces.
Highlights
The additive technologies allow to manufacture work pieces with the improved properties and ensure their economic expediency when the shape is irregular [1]
The structure forming of deposited metal at arc additive manufacturing occurs at a crystallization and consequent technologically inevitable thermo- cyclic treatment (ATCT) from the last passes to the previous ones [7, 8]
The chemical composition depends on welding mode and saturation\expulsion of alloy elements in the process of chemical interaction between depositing metal and protective medium [10]
Summary
The additive technologies allow to manufacture work pieces with the improved properties and ensure their economic expediency when the shape is irregular [1]. The works using WAAM for workspaces from low-carbon and low-alloy steels, apply gas-metal arc welding [4, 5, 6]. The structure forming of deposited metal at arc additive manufacturing occurs at a crystallization and consequent technologically inevitable (automatic) thermo- cyclic treatment (ATCT) from the last passes to the previous ones [7, 8]. The chemical composition depends on welding mode and saturation\expulsion of alloy elements in the process of chemical interaction between depositing metal and protective medium [10]. The set of metal properties obtained by arc additive manufacture is attractive enough for its use in industry. The metal has high level of residence to brittle fracture [11]
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