中文摘要：

水把纯铁分裂成原子粉末被高速度压缩(HVC ) 有或没有上面的松驰压缩帮助(URA ) 设备。绿密度上的 URA 设备的影响，弹回，绿力量和坚硬被学习。样品的词法特征被扫描电子显微镜(SEM ) 观察。样品的格林力量被计算机测量控制通用严峻的机器。当协议的击长度增加，绿密度，绿力量和坚硬逐渐地增加，结果显示出那。在相同的击长度，协议的绿密度与 URA 压了设计比没有 URA，协议压的高是 2% 设备。与 URA 设备压的协议的绿力量和坚硬比没有 URA 设备，协议压的高。而且，光线协议弹回在击长度与增长逐渐地减少了，虽然与 URA 设备准备的协议的更低。

英文摘要：

Water atomized pure iron powder was compacted by high velocity compaction （HVC） with and without upper relaxation assist （URA） device. The influence of URA device on green density, spring back, green strength and hardness was studied. Morphological characteristics of the samples were observed by scanning electron microscope （SEM）. Green strength of the samples was measured by computer controlled universal testing machine. The results show that as stroke length increases, the green density, green strength and hardness of the compacts increase gradually. At the identical stroke length, the green density of the compacts pressed with URA devise was 2% higher than the compacts pressed without URA device. The green strength and hardness of the compacts pressed with URA device were higher than the compacts pressed without URA device. Furthermore, the radial spring back of the compacts decreased gradually with the increment in stroke length, whilst that of compacts prepared with URA device was lower.