不同包套材料对钼粉末锻造中塑性变形和致密化的研究（英文）

Plastic Deformation and Densification Behavior By Different Sheath Materials in Molybdenum Powder Forging

采用有限元法来研究钼粉末等温包套锻造中的塑性变形和致密化。采用3种包套材料来进行模拟:45钢、304不锈钢、和GH4169合金。模拟表明,应变、密度和平均应力的分布明显受护套材料影响,应力、密度分布呈现"U"型。并且再相同锻造条件下,坯料的应力和密度随包套材料所受应力的增加而增加。当变形程度超过40%时用304不锈钢材料做包套材料的坯料的均匀性最好。除了边缘的较小区域外,平均应力随着离中心的距离的增加而直线下降。研究表明,在这3种材料中,304不锈钢最适合做钼粉末等温包套锻造的包套材料。

Finite element method（FEM） was used to investigate the plastic deformation and densification for porous molybdenum in isothermal canned forging. Separate simulations were performed using different sheath materials： 45 steel, 304 stainless steel and GH4169. The simulations demonstrate that the distributions of strain, density and average stress strongly depend on the sheath materials. The distributions of density and strain present the shape of ＂U＂. The density and strain, increase with increasing strength for sheath materials at the same levels of deformation. The homogeneity of strain and density are best in billet encapsulated with the 304 stainless steel when the deformation extent exceeds 40%. The average stress decreases linearly with the increasing distance from center except for small area near the edges. Among the three materials, the 304 stainless steel is the most suitable materials as sheath during isothermal canned forging of porous molybdenum.