Abstract
Wire arc additive manufacturing (WAAM) technology is widely used in the fields of aerospace, shipbuilding, and automobile industry due to the advantages of fast forming speed, high material utilization and low production cost. WAAM is extremely sensitive to parameters, and different processes and materials produce different deposition effects and properties. Therefore, it is of great significance to study the WAAM formability of various materials. Herein, the microstructure, mechanical properties, and galvanic corrosion behavior of the low-carbon high-strength steel (10CrNi3MoV) fabricated by cold metal transfer (CMT) WAAM technology were investigated. The single-channel multilayer deposition parts were prepared by reciprocating deposition, and the forming parts were divided into six zones by observing the different positions of the structure: matrix, heat-affected zone, remelting zone, initial deposition zone, interlayer zone, and interlayer bonding zone. Electron backscattered diffraction (EBSD) analysis showed that the amount of recrystallization and substructure in the deposition layer had no obvious change, and the texture phenomenon was the most obvious in the initial deposition zone of the pole map reaction. The texture phenomenon gradually weakened with the increase of the deposition layers. The microhardness from the matrix to the deposition stable zone was tested. The hardness of the matrix changed smoothly, that of the heat-affected zone was the largest, and that of the deposition layer was 221–282 HV0.2. The tensile properties were tested in different directions and angles, and the yield strength and tensile strength of the deposited layer were more than 550 MPa and 760 MPa, respectively. The galvanic corrosion behavior between the deposited layer and the matrix was investigated, and the polarization curve showed that the corrosion potential of the deposited layer was lower than that of the matrix, and the corrosion current density of the deposited layer was higher than that of the matrix.
Highlights
Flexible and digital manufacturing technologies, such as additive manufacturing (AM), have evolved as the future of modern manufacturing, exhibiting the capability to obtain multi-dimensional components and material functionality improvement [1]
In this paper, 10CrNi3MoV parts were fabricated by Wire arc additive manufacturing (WAAM) based on cold metal transfer (CMT)
The 10CrNi3MoV deposit prepared by WAAM was well-formed without collapse
Summary
Flexible and digital manufacturing technologies, such as additive manufacturing (AM), have evolved as the future of modern manufacturing, exhibiting the capability to obtain multi-dimensional components and material functionality improvement [1]. Wire arc additive manufacturing (WAAM) is a branch of AM that has the advantages of fast forming speed, high material utilization rate, and low production cost, which is a good method for manufacturing large parts in aerospace, shipbuilding, automobile industry, and other fields [2]. Daniel Oropeza et al [11] and others studied the manufacturing process of the nano-reinforced aluminum alloy 7075 welding wire that use widely in aerospace, which showed that WAAM produced complex parts with high strength and no cracks. Tianying He et al [12] successfully manufactured ship propeller brackets using CMT technology. The galvanic corrosion behavior of the material was studied, which provided the basic data for the preparation of the high-performance and complex high-strength steel structure
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