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ISSN Печать: 1093-3611
ISSN Онлайн: 1940-4360
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MECHANICAL PROPERTIES OF STEEL-COPPER POLYMETAL MANUFACTURED BY THE WIRE-FEED ELECTRON-BEAM ADDITIVE TECHNOLOGY
Краткое описание
In this research, the mechanical properties of additively manufactured steel, copper, and steel-copper polymetallic parts are investigated. With the use of the wire-feed electron-beam additive manufacturing parts are formed without defects like pores and cracks, which demonstrate full deposition of layers and high wettability between them. This exerts a favorable influence on the value of mechanical properties as the quality of polymetals depends directly on the quality of the interface between the materials. An analysis of mechanical and micromechanical properties has been carried out which showed that the values of the characteristics of additive steel and copper samples lie within the range of values for stainless steel only in the state after rolling, and for copper after quenching. Moreover, micromechanical tests, such as microhardness measurements, exceed the original samples by ≈ 1.3 times. The results of tensile tests of the steel-copper polymetallic sample indicate that the deformation passes through the copper phase, with a small hardening effect from the introduction of austenitic steel particles. The zone of transition from one material to another does not lose strength. The average values of the conventional yield strength of the interface are σ0.2 = 165 MPa and the average ultimate tensile stress is σ = 254 MPa. The relative elongation is on the average δ = 24%. Intens development of deformation of the steel-copper polymetallic sample is observed in the transition region between the materials, where a neck is further formed and a fracture of the sample occurs. Thus, it is elucidated that the fabrication of articles by the method of wire-feed electron-beam additive manufacturing leads to the hardening of the material, at the cost of repeated heatings of already applied layers. Hence, the method of wire-feed electron-beam additive manufacturing does not exert a negative effect on the mechanical properties of materials in fabrication of polymetals for which the formation of intermetallic phases is not characteristic. As a consequence, wire-feed electron-beam additive manufacturing can produce metallic parts that fulfill the requirements of industrial applications.
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