Multi-Objective Parameter Optimization Strategy of Rheological Instability and Power Dissipation for Molybdenum Alloy Based on Genetic Algorithm

Abstract

Because of the limited performance of the core material of heat pipe reactor, the cooling effect of nuclear power source is restricted. Molybdenum alloy with excellent comprehensive performance has been a popular core material. To improve the performance of the molybdenum alloy hot forming process, the rheological instability and power dissipation of recrystallized molybdenum alloys are studied by orthogonal arrays L16 with three factors and four levels in this paper. Considering the experimental temperature, strain rate and true strain, the rheological instability and power dissipation are optimized based on a genetic algorithm (GA), with optimal process parameters of recrystallized molybdenum alloys obtained as follows by taking the rheological instability and power dissipation as the objectives. The experimental temperature is 792.424 ℃, the strain rate is 0.01 s-1, the true strain is 0.1N, the rheological instability is 0.23336, and the power dissipation is 0.6832. The rheological instability is increased by 21.79% and the power dissipation is decreased by 64.95% compared with that in the experiment (the experimental temperature is 650 ℃, the strain rate is 0.01 s-1, and the true strain is 0.1N in the experiment with similar parameters in the orthogonal arrays).