热等静压包套变形与粉末致密化的研究  

Investigation can's deformation and densification for stainless steel powders during hot isostatic pressing

作　　者：侯志强[1] 史玉升[1] 刘国承[1] 王基维[1] 魏青松[1] 

机构地区：[1]华中科技大学材料成形与模具技术国家重点实验室,武汉430074

出　　处：《材料与冶金学报》2011年第2期136-141,共6页Journal of Materials and Metallurgy

基　　金：国家863项目(No.2007AA03Z115);国家科技重大专项(No.2009ZX04005-041);华中科技大学自主创新基金(No.2009Z014Y)

摘　　要：根据粉末塑性变形理论,采用MSC.M arc软件完成了316不锈钢粉末热等净压成形过程的有限元模拟.重点分析了热等静压成形过程中致密包套沿径向和轴向的形变过程及其内部松装粉末的致密化规律.为了验证模拟结果,完成了测试样件的实物实验.为了更精确的结果比较,在样件的不同位置上选取了测试点.对比分析模拟和试验对应点的研究结果表明,径向位移的模拟结果偏小,相关点误差达到-5.33%、-13.64%;而轴向位移的模拟结果偏大,相关点的误差达到了7.43%、3.14%和4.57%;两者变形体积的相互抵消致使致密度模拟误差约为4.23%~6.45%。研究结果还表明,对于简单的柱状形包套采用有限元模拟的方法,可以形象、准确描述包套的形变以及粉末的致密化过程,此方法可以为复杂结构包套的研究提供参考,从而实现热等静压过程的精确控形.According to the plastic deformation theory of powder,finite element simulation of 316 stainless steel powder with hot isostatic pressing was completed by using MSC.Marc Software.The can＇ s deformation process along the radial and axial directions was caculated and the characteristics of the powder＇ s shaping densification analyzed.For more accurate results,test points of different location in the sample were selected.From the comparison of the data,the simulation results of the radial displacement are smaller,the error ratio of the related point is-5.33%,-13.64%;while the simulation results of the axial displacement are slightly larger,the related point error ratio reaches 7.43%,3.14% and 4.57%;the error ratio of density in the simulation is only-0.43% to 1.93%.For simple cylindrical shape components,simulation of finite element can accuratioly describe the deformation of the can and the powder densification process,this method can be set for the study of complex structure caused by deformation.

关 键 词：热等静压 数值模拟 验证 包套 粉末 致密化 

分 类 号：TF123[冶金工程—粉末冶金]