Fabrication, microstructure and mechanical properties of ODS ferritic alloy by SPS and HIP
首发时间:2012-08-03
Abstract:The oxide-dispersion-strengthened (ODS) ferritic alloy powders were prepared by mechanical alloying (MA) at a high rotation speed of 720 rpm for 24 h. All the elements were mixed homogenously in the powders, and Cr and Al dissolved in α-Fe after MA. The bulk samples were produced by spark plasma sintering (SPS) at 950 ℃ and 50 MPa and by hot isostatic pressing (HIP) at 1150 ℃ and 130 MPa, respectively. The sample prepared by SPS showed a tensile strength of 730 MPa and a poor ductility due to the existence of pores in microsize. The sample prepared by HIP had a high tensile strength of 980 MPa, yield strength of 710 MPa and elongation of 10.3 %. The excellent mechanical properties of ODS alloy by HIP was due to the small grain size of the matrix of about 400 nm and the fine oxide particles of 5-40 nm.
keywords: ODS superalloy mechanical alloying spark plasma sintering hot isostatic pressing microstructure mechanical property
点击查看论文中文信息
SPS和HIP法制备ODS高温合金及其微观表征与力学性能
摘要:本文采用机械合金化方法在720 rpm的转速下经过24小时球磨得到了ODS铁基高温合金粉末,分别在950℃,50 MPa下和1150℃,130MPa下进行等离子烧结和热等静压成形。采用XRD、SEM和TEM对合金粉末以及块体试样进行了微观分析,并测试了块体合金的拉伸力学性能。结果表明,通过24小时高能球磨使ODS合金粉末中的各项组元充分混合,并发生Cr、Al的固溶反应。等离子烧结的样品抗拉强度为730 MPa,由于其基体存在孔隙,延伸率很低。热等静压制备的样品抗拉强度为980 MPa,屈服强度为710MPa,延伸率为10.3%,其优异的力学性能是由于平均大小为400 nm的细小的晶粒和分布基体上的细小纳米氧化物的强化作用。
基金:
论文图表:
引用
No.****
同行评议
共计0人参与
勘误表
SPS和HIP法制备ODS高温合金及其微观表征与力学性能
评论
全部评论0/1000