Fe-Cr-Al合金退火过程中组织和性能的演变  

Microstructure evolution and properties of Fe-Cr-Al alloy in the process of annealing

作　　者：刘胜[1] 米振莉[1] 唐荻[1] 江海涛[1] 焦竞仪[1] 

机构地区：[1]北京科技大学高效轧制国家工程研究中心,北京100083

出　　处：《材料热处理学报》2013年第7期53-57,共5页Transactions of Materials and Heat Treatment

基　　金：北京市科技计划(D07010300700701)

摘　　要：采用电子背散射衍射技术(EBSD)对Fe-Cr-Al合金在退火过程中的组织演变规律进行了研究,分析了退火时间对晶界分布、微观织构和性能的影响。结果表明:退火初期合金组织发生回复过程,晶界以小角晶界为主,织构为典型的立方晶体形变织构{001}<110>;退火时间在3～15 min内,组织发生再结晶,大角晶界急剧增加,织构转变为{111}<121>和{111}<112>;退火时间超过15 min后,合金的{111}织构组分减弱,而{001}织构组分增强。随着退火时间的延长,断后伸长率和塑性应变比(r值)先增大后减小,退火时间在15 min时断后伸长率和r值都达到最大值,分别为19.6%和1.23。r值与{111}/{001}织构强度的比值有很好的对应关系。Microstructure evolution of Fe-Cr-Al alloy in the process of annealing was studied by electron backscatter diffraction（EBSD） techniquer.The effect of annealing time on grain boundary distribution,grains orientation and mechanical properties of the alloy was examined.The results indicate that in initial stage of annealing,microstructure evolution is dominated by recovery process,which is characterized by low angle boundaries and {001}110 deformation texture;recrystallization is characterized by increasing large angle boundaries and {111}121,{111}112 texture;after annealing for 15 min,{001} texture increases with the expense of {111} texture.The elongation and r-value increase and then decrease with the increase of annealing time,which reach the maximum values of 19.6% and 1.23,respectively,at annealing time of 15 min.There is well corresponding relationship between r-value and intensity ratio of {111}/{001}.

关 键 词：FE-CR-AL合金 组织演变 EBSD r值 

分 类 号：TG142.33[一般工业技术—材料科学与工程]