Modeling of the Closure of Metallurgical Defects in the Magnesium Alloy Die Forging Process

Abstract

The article discusses the impact of hot forging elongation operations on the closure of metallurgical discontinuities such as middle porosity in selected magnesium alloys (AZ91) depending on the shape of the input used. Numerical modeling was carried out using the Forge®NxT 2.1 program based on the finite element method and laboratory modeling in order to bring about the closure of defects of metallurgical origin in deformed forging ingots. On the basis of the conducted research, optimal values of the main technological parameters of forging and appropriate groups of anvils to be used in individual stages of forging were proposed in order to eliminate metallurgical defects.

Investigation of the Influence of Hot Forging Parameters on the Closing Conditions of Internal Metallurgical Defects in Zirconium Alloy Ingots

“…During the welding process of the discontinuity, on the right and left sides of the discontinuity, there are medium stresses with large values; these are generally negative medium stresses (there is high hydrostatic pressure). On the other hand, at the top and bottom of the welded discontinuity, unfavorable positive medium stresses with very high values are formed (there is no hydrostatic pressure) [ 27 ].…”

Modeling of Closure of Metallurgical Discontinuities in the Process of Forging Zirconium Alloy

“…An analysis of the literature shows that methods for closing foundry voids during hot elongation of steel bars and aluminum and magnesium alloys are known [8][9][10][11][12][13][14][15], while no workswere found on closing foundry voids in the elongation operation of zirconium bars with the exception of the authors' work [16].…”

“…Banaszek et al [15] carried out numerical modeling of the closure of foundry voids during the forging operation of Mg alloys bars and physical verification of the obtained results.…”

“…In the work [15], the conditions were determined for closing foundry voids in the forging process of M5 alloy rods with the use of rhombic and flat anvils. To do so, the investigators used a physical simulator of metallurgical processes, the Gleeble 3800, and FORGE software, with which computer simulations of this process were carried out.…”

Hot Deformation and Microstructure Evolution of Metallic Materials

“…The proposed forging process was verified in industrial conditions. The article of Banaszek et al [ 21 ] discusses the impact of hot forging elongation operations on the closure of metallurgical discontinuities, such as middle porosity in selected magnesium alloys, depending on the shape of the input used. Laboratory simulations and numerical modeling, using the Forge ® NxT 2.1 program based on the finite element method, were carried out in order to bring about the closure of defects of metallurgical origin in deformed forging ingots.…”