Effect of back-pressing on dense consolidation of non-dense molybdenum power during equal channel angular pressing
Effect of back-pressing on dense consolidation of non-dense molybdenum power during equal channel angular pressing
复制标题
等通道角挤压过程中反压对非致密钼粉致密固结的影响
DOI：
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发表时间：
2015-02
期刊：
影响因子：
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通讯作者：
Xue, Ke-Min
中科院分区：
文献类型：
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作者：
Tian, Ye;Li, Ping;Wang, Xue;Xue, Ke-Min
以非致密纯钼粉为例，采用等通道角挤压(ECAP)对有背压和无背压的钼粉进行等通道角挤压(ECAP)，并用二维区元模型(DEM)进行模拟。得到了两种情况的颗粒流动规律、载荷曲线和相对密度分布。实验得到的第1道次ECAP试样的形状和显微硬度分布与模拟结果具有良好的一致性。实验和模拟结果表明：非致密粉末ECAP过程中施加背压可以有效控制粉末颗粒的流动，背压可以有效提高塑化效率和变形均匀性，同时提高致密固结效果。
Taking non-dense pure molybdenum powder as an example, the molybdenum powders either with or without back pressure were carried out using equal channel angular pressing(ECAP) and simulated with the two-dimensional district element model(DEM). Two cases of granular flowing law, the load curve and the distribution of the relative density were obtained. The shape and microhardness distribution of 1st pass ECAP specimens from the experiment have good consistency with the simulation results. Experimental and simulation results show that: Non-dense powder ECAP process of applying back pressure can effectively control the flow of powder particles, back pressure can effectively increase the plasticizing efficiency and the deformation uniformity, in addition improve the effect of dense consolidation.