片状粉末冶金法制备ODS铁素体不锈钢及其微观结构特征研究  

Research on Preparation of ODS Ferritic Stainless Steel by Flake Powder Metallurgy Method and Its Microstructure Characteristics

作　　者：张芝民 刘婷婷 宋波 郭宁 ZHANG Zhimin;LIU Tingting;SONG Bo;GUO Ning(Faculty of Materials and Energy,Southwest University,Chongqing 400715,China)

机构地区：[1]西南大学材料与能源学部,重庆400715

出　　处：《热加工工艺》2020年第12期40-44,共5页Hot Working Technology

基　　金：国家自然科学基金项目(51501158,51601154)。

摘　　要：采用片状粉末冶金方法制备了氧化物弥散增强(ODS)铁素体不锈钢。利用SEM研究了铁素体不锈粉末在低能球磨工艺中粉末形貌的演化规律以及烧结后样品的微观组织。结果表明:铁素体不锈粉末具有优异的塑性变形能力,在低速球磨过程中发生减薄和弯折等变形,随着球磨时间的增长,初始不规则粉末被研磨成薄片状粉末。当球磨时间达到20 h时,片状粉末厚度达到纳米尺寸(100~200 nm),径厚比达到最大值(约为110)。经冷压烧结后,铁素体基体呈现结状组织,Y2O3颗粒弥散分布在原纳米片状粉末界面处,这说明采用高径厚比的纳米片状粉末能实现Y2O3颗粒的弥散分布。Oxide dispersion strengthened(ODS)ferritic stainless steel was fabricated by flake powder metallurgy method.Scanning electron microscopy(SEM)was used to study the stainless powder morphology evolution during low energy ball milling and the microstructure of the samples after sintering.The results show that the ferrite stainless powder has excellent plastic deformation ability.The thinning and bending deformation occur during low-speed ball milling.With the ball milling time increasing,the initial irregular powder is gradually ground into flaky powder.When the ball milling time reaches 20 h,the thickness of the flake powder reaches a nanometer size(100-200 nm),and the diameter-to-thickness ratio reaches a maximum value(about 110).After cold pressing and sintering,the ferrite matrix exhibits nodules,and Y2O3 particles are dispersed at the interface of the original nanosized flake powder,which indicates that the dispersion distribution of Y2O3 particles can be more effectively achieved by using nanosized flake powder with a high diameter-to-thickness ratio.

关 键 词：ODS钢 铁素体不锈钢 粉末冶金 微观组织 

分 类 号：TG306[金属学及工艺—金属压力加工]