14CrODS铁素体钢的制备及其拉伸性能  

Preparation and Tensile Properties of 14CrODS Ferritic Steel

作　　者：廖璐[1] 周张健[1] 李明[1] 

机构地区：[1]北京科技大学材料科学与工程学院,北京100083

出　　处：《材料工程》2012年第4期42-46,51,共6页Journal of Materials Engineering

基　　金：国家973重点基础研究发展计划资助项目(2007CB209801)

摘　　要：通过机械合金化制备了成分(质量分数/%)为Fe-14Cr-0.5Ti-0.35Y2O3的氧化物弥散强化合金粉末,机械合金化后粉末内部各合金元素分布均匀。采用热等静压的方法制得14CrODS铁素体钢,并对其进行锻造和热处理。与未添加氧化物弥散颗粒的14CrNA相比,14CrODS钢的强度有明显提高,但是与MA957有一定差距,抗拉强度有待改进;与MA957相比,14CrODS表现出良好的塑性,锻造可进一步提高14CrODS的高温塑性,但是锻造过程中的残余应力使材料低温拉伸时呈脆性,退火可去除残余应力,极大地提高14CrODS的塑性,使其远优于MA957。A ODS ferritic steel powder with the chemical composition（mass fraction/%）of Fe-14Cr-0.5Ti-0.35Y2O3 was prepared by mechanically alloying（MA）,and the element distribution was homogenous.The MA powder was consolidated by hot isostatic pressing（HIP）,followed by forging and annealing.Compared to 14CrNA steel without ODS particles,the tensile strength of 14CrODS steel was excellent,but not so good compared with MA957,thus need improvement.The ductility of 14CrODS was much better than MA957,and could be enhanced further by forging.However,residual stress existed during forging,making the 14CrODS steel brittle in room temperature tensile tests.Annealing could remove the residual stress and significantly improve the ductility of 14CrODS,which was more excellent than MA957.

关 键 词：氧化物弥散强化 机械合金化 热等静压 拉伸性能 

分 类 号：TG115.52[金属学及工艺—物理冶金]