温压致密化机理及其在温压粉末设计中的应用  

Densification mechanism and its applications in designing powder mixtures for warm compaction

作　　者：曹顺华[1] 易健宏[1] 奉东文[1] 曲选辉[1] 黄伯云[1] 

机构地区：[1]粉末冶金国家重点实验室,长沙410083

出　　处：《粉末冶金材料科学与工程》2001年第3期198-204,共7页Materials Science and Engineering of Powder Metallurgy

基　　金：国家"863"高科技计划资助项目(715-012-0060)

摘　　要：温压是一项以较低的成本制造高性能铁基粉末冶金零部件的新型成形技术.实验发现,颗粒重排是温压过程的主导致密化机理,而为颗粒重排提供协调性的塑性变形是另一重要的致密化机理.作者分析了影响这2个致密化机理的主要因素.在此基础上,提出了温压粉末原料的设计原则,并成功设计了高性能。低成本合金钢粉末的3大体系温压粉末原料.Warm compaction is a new forming technique for fabricating high performance ferrous P/M Parts atlower cost. The experiment revealed that particle rearrangement is the domain densification mechanismduring powder warm pressing, and the plastical deformation of podwer particle, which offers accommodatedeformation for the particle rearrangement, is another important one. In addition, all factors controllingtwo densification mechanisms are discussed in detail. A designing rule of powder mixtures for warm press-ing is also established for the purpose. Water-atomized iron powder, iron particles recycled from rotaryfumece in steel making and water-atomized steel powder are successfully used for fabricating respectivelyhigh performance, lower cost and homogenous powder mixtures.

关 键 词：致密化机理 颗粒重排列 塑性变形 温压 

分 类 号：TF124.38[冶金工程—粉末冶金]