纳米结构14Cr-ODS铁素体钢的制备与微观结构.pdf

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1、第48卷第6期金扁学玫、1．48NO．62012年6月第649653页ACTAMETALLURGICASINICAJun．2012PP．649—653纳米结构14Cr—ODS铁素体钢的制备与微观结构吕铮卢晨阳张守辉谢锐刘春明(东北大学材料各向异性与织构教育部重点实验室，沈阳110819)摘要采用机械合金化和热等静压技术制备纳米结构14CrODS铁素体钢，利用SEM，XRD和EDS等手段分析了机械合金化过程中粉末形态和结构的变化以及合金元素的固溶情况，通过TEM研究了14Cr—ODS铁素体钢的微观结构及其在短时高温下的稳定性．结果表明，元素粉末经机械合金化过

2、程中发生反复的冷焊和断裂导致粉末尺寸先增加(02h)后下降(2—70h)，晶粒尺寸随球磨时间的增加而减小，同时Cr，W和Y2Oa等固溶入F1e基体中．纳米结构14Cr—ODS钢中存在3种析出相：极高密度的、尺寸在几个纳米的富Y—TiO团簇，少量Y2Ti2O7析出相和块状富Cr—Ti相．经1250℃，8h短时高温热处理后，纳米团簇显示出了良好的稳定性，Y2Ti2O7相的密度增加．关键词ODS钢，机械合金化，热等静压，富Y—Ti一0团簇，稳定性中图法分类号TL341文献标识码A文章编号0412-1961f2012)06—0649—05PREPART10NAND

3、CHARACTERIZATIoN0FNAN0一STRUCTURED14Cr—oDSFERRITICSTEELLUZheng．LUChenyang．ZHANGShouhui。xIERu．LuChunmingKeyLaboratoryforAnisotropyandTextureofMaterials(MinistryofEducation)，NortheasternUniversity,Shenyang110819Correspondent：LUZheng}professor,Tel：(024)83691576}E—mail：luz@smm．neu．edu．

4、cnSuppoSedbyNationafNaturafScienceFoundationofChina(Nos．50971033and91026013)．Nationa?BasicResearchProgramofChinaNo．2011CB610405)IProgramforNewCenturyEx—cellentTalentsinUniversity(No．NCET100302)andFundamentafResearchFundsrtheCentralUniversities(No．N100402001JManuscriptreceived2012—

5、02—13．inrevisedform2、012—04—16ABSTRACTNado—structuredoxidedispersionstrengthenedfODS1ferriticsteelsarethelcad—ingcandidatesoffuelcladdingforfuturefastneutronfeederreactorsduetotheirexcellentradia—tiontoleranceandhigh—temperaturecreepstrength．A14Cr—ODSstee1waspreparedbymechan—icala

6、lloy(MA)andhotisostaticpressingfHIP)methods．ThemorphologyandmicrostructureofMApowdersandthemicrostructureof14Cr一0DSsteelwerecharacterizedbvSEM，XRD．EDSandTEM．TheresultsshowedthatduringtheMA．thesizeofpowdersincreaseswiththeincreas—ingmillingtime(0-2h)，thendecreaseswiththeincreasingm

7、illingtime(2-70h)．Thegrainsizedecreaseswiththeincreasingmillingtime．ThealloyingelementsandY2O3dissolvefullyintoFematrixduringMAafter70h．Threekindsofprecipitatesareobservedintheconsolidated14C卜ODSsteel：veryhighnumberdensityofnanoscaleY—Ti—Orichclusters，feWpyrochlorestructureY2TO7pa

8、rticlesandsomeCr—Ti-richparticles