摘要
粉末冶金制备的FeCrAl合金中存在的原始粉末颗粒边界对合金力学性能及断裂机制的影响目前尚不明确。本工作通过显微组织分析及扫描电镜原位拉伸试验,系统研究了FeCrAl合金中原始粉末颗粒边界对合金冲击韧性的影响机理。结果表明:粉末冶金制备的FeCrAl合金中原始粉末颗粒边界析出相主要为Nb的碳氮化物,在受力变形过程中,裂纹沿原始粉末颗粒边界处Nb的碳氮化物萌生并扩展,造成合金局部发生脆性沿晶断裂,从而导致粉末冶金制备的FeCrAl合金晶界强度较低、冲击韧性较差。
The effect of prior particle boundary(PPB)in the FeCrAl alloy prepared by powder metallurgy on the impact toughness is undefined.Mechanism about the effect of PPB on the impact toughness of FeCrAl alloy was investigated by microstructure analysis and in-situ tensile test.The results showed that prior particle boundary precipitations were mainly niobium carbonitrides.During deformation,cracks initiation and propagation in niobium carbonitrides along prior particle boundaries and lead to partial intergranular fracture,low grain-boundary strength and brittle fracture of FeCrAl alloy prepared by powder metallurgy.
作者
陈永庆
闫英杰
曹睿
刘刚
秦巍
车洪艳
王铁军
CHEN Yongqing;YAN Yingjie;CAO Rui;LIU Gang;QIN Wei;CHE Hongyan;WANG Tiejun(State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals,Lanzhou University of Technology,Lanzhou 730050,China;Advanced Technology&Materials Limited Company,China Iron&Steel Research Institute Group,Beijing 100081,China;Engineering and Technology Research Center of Hot Isostatic Pressing,Zhuozhou 072750,China)
出处
《材料导报》
EI
CAS
CSCD
北大核心
2021年第6期6131-6134,共4页
Materials Reports
基金
国家自然科学基金(51961024,51761027)。
