纯钼的多向锻造数值模拟及实验研究

采用DEFORM–3D有限元模拟软件对纯钼坯体多向锻造大塑性变形过程进行数值模拟，结合锻造实验，研究了变形温度、锻造压下量及锻造工步等对锻件等效应变及其均匀性分布的影响，优选出了反复拔长–镦粗的锻造工艺。研究发现，随着锻造的进行，等效应变分布趋于均匀，在第三次拔长过后，锻件心部等效应变值可达到3.75以上，锻件整体相对密度接近于100%。初始平均晶粒尺寸约55 μm的纯钼烧结坯经多向锻造后，烧结孔洞明显减少，相对密度增加，晶粒尺寸减小至2～3 μm。

Numerical simulation and experimental investigation on multi-directional forging of pure molybdenum

The multi-directional forging process of pure molybdenum was numerically simulated by using DEFORM-3D finite element simulation software. Based on the forging experiment, the effects of deformation temperature, forging reduction, and forging steps on the equivalent strain and uniform distribution of the forgings were studied, and the forging process of repeatedly drawing and upsetting was optimized. It is found that, with the forging process, the equivalent strain distribution tends to be uniform. After the third drawing, the equivalent strain value at the core of the forging can reach more than 3.75, and the overall relative density of the forging is close to 100%. After the multi-direction forging, the sintered pores of the pure sintered molybdenum billets with the initial average grain size of about 55 μm are reduced obviously, the relative density is increased, and the grain size is reduced to 2~3 μm.