Abstract
Microalloying vanadium can change the segregation state of Nb element in IN718 alloy, reduce the formation of harmful Laves phase and refine the dendritic structure of IN718 alloy during the laser process. Therefore, IN718 alloys with V content from 0.081 to 1.88 wt.% were prepared and evaluated. Metallographic microscopy and scanning electron microscopy were used to observe the corresponding morphology, structure, and distribution of elements. First of all, it was found that the addition of V refines the grain size of IN718 alloy and reduces the primary dendrite arm spacing. Secondly, adding V to IN718 alloy can reduce the porosity of the cladding layer. The elements are uniformly distributed in the cladding layer, and the addition of vanadium reduces the segregation degree of the Nb element, which is conducive to homogenization. In addition, microhardness and residual stress were also investigated. Finally, the addition of vanadium was shown to have no apparent effect on the tensile strength and yield strength but can significantly improve the elongation of IN718 alloy. In conclusion, the microstructure and mechanical properties of IN718 alloy with 0.081 wt.% vanadium content provide a new solution to improve the application level of IN718 alloy in laser cladding.
Highlights
IN718 alloy is designed for strength, oxidation resistance and good fatigue life at high temperatures of up to 700 ◦ C, in addition to excellent weldability through its relatively slow precipitation kinetics [1,2,3]
The experimental materials are mainly divided into two types, one is vanadium powder, which is prepared primarily by the atomization and crushing process (ACP), and its shape is irregular (Figure 2a), and the other is IN718 alloy powder, which is mainly produced through the plasma rotating electrode process (PREP)
During the laser cladding process, the addition of vanadium has a positive impact on the microstructure, segregation and mechanical properties of IN718 alloy
Summary
IN718 alloy is designed for strength, oxidation resistance and good fatigue life at high temperatures of up to 700 ◦ C, in addition to excellent weldability through its relatively slow precipitation kinetics [1,2,3]. The addition of phosphorus can change the propagation path of cracks istics of the IN718 alloy and affects its mechanical properties, and a relatively comprofrom the matrix (Laves phase) around the particles to the interface between the matrix and mised vanadium content is obtained [15]. In our previous research [16], the addition of vanadium was shown to have a positive effect on the microstructure uniformity, Lave phase distribution and mechanical properVanadium (V) has a high solubility in austenite and is one of the most commonly used ties of the IN718 alloy. The effect of vanadium on wt.%, by weight, of vanadium into IN718 alloy on the microstructure and mechanical the solidification and homogenization behavior of IN718 alloy was studied It is observed properties of the laser cladding. Materials and Methods alloys with different amounts of vanadium are shown in Table 1 [14]
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