钕铁硼烧结致密化过程中的应力演变模拟及实验验证OA

Based on the Drucker-Prager Cap model,numerical simulation studies on the densification process of Nd-Fe-B blocks were carried out using ABAQUS software.By constructing the stress field analysis model before and after powder sintering,the stress distribution characteristics and microstructure evolution laws at different sintering temperatures were systematically compared,and the results were analyzed in conjunction with scanning electron microscopy.The research shows that within a reasonable temperature range,as the sintering temperature increases,the uniformity of stress distribution and relative density improves,and the probability of crack initiation decreases.At the same time,the residual stress obtained from numerical simulation is in good agreement with the experimental test results.This study provides important theoretical basis and practical guidance for the optimization of the preparation process of Nd-Fe-B permanent magnetic materials and the improvement of material performance.