Numerical simulation study on microcrystalline plastic evolution of 120 billet pulling and straightening process based on Voronoi method
The three-dimensional random microcrystalline model for billet pulling and straightening process was established based on the Voronoi method combined with billets in pulling and straightening machine site actual working conditions.The characteristics of grain het-erogeneity were determined and the grain types were classified by statistical grain heterogeneity information of nanoindentation experi-ments.The material properties of each grain type were determined by grain heterogeneity coefficient.Based on Python script program-ming,different material properties were randomly assigned to Voronoi cellular according to probability.The thermodynamically coupled microcrystalline model of SUS301L-HT stainless steel in billet pulling and straightening process considering grain heterogeneity was estab-lished,and the transient evolution laws of temperature and stress fields in pulling and straightening process were calculated and re-vealed.The results show that the model considering grain heterogeneity can better reveal homogeneous distribution state of temperature and stress fields in pulling and straightening process.In particular,the stress at the adjacent grain boundaries of the billet undergoes abrupt changes and the greater the difference in mechanical properties between grains,the more significant the mutation phenomenon.The nu-merical model of billet in pulling and straightening based on the Voronoi method considering grain heterogeneity can provide effective feed-back on the microscopic evolution mechanism in pulling and straightening process.
numerical simulationgrain heterogeneitySUS301L-HT stainless steelVoronoi model
万方数据
维普
