The Microstructure of Dislocated Martensitis Steel
One of the most fascinating microstructures found in martensitic steels is that of Fe-12Mn,which spontaneously produces an ultrafine-grained microstructure on quenching,with an effective grain size in the micron range and an exceptional resistance to cleavage fracture.The source,and,in fact,the details of this microstructure have been unclear for decades.However,recent research using a combination of TEM,EBSD and theoretical analysis offers new insight.As will be discussed,the microstructure is a laminate of thin plates of dislocated martensite laths that with predominantly twinned boundaries,and an invariant plane of the type ”011”α”||”111”γ.Each plate contains all 6 of the martensite variants that are compatible with the martensite packet that includes the plate.The structure of the plate follows from the fact that it forms from the parent austenite through the intermediary of a planar,hexagonal ε-martensite phase.The overall microstructure is the simplest compatible structure that fully relaxes the shear strain of the martensite transformation.
dislocated martensitic steel martensitic transformation microstructure
Morris J.W. Kinney C. Qi Liang Pytlewski K.R. Khachaturyan A.G. Kim N.J.
Department of Materials Science and Engineering,University of California,Berkeley,CA 94720,USA Graduate Institute of Ferrous Technology,POSTECH,Pohang,Korea
国内会议
上海
英文
1-8
2015-10-21（万方平台首次上网日期，不代表论文的发表时间）