The microstructure of dislocated martensitic steel
Recent research that emphasizes electron backscatter diffraction ( EBSD) as a characterization tool has clarified the microstructure of dislocated martensitic steel formed by quenching moderate to large-grained austenite.The present paper specifically reports results for conventional 9Ni steel.Typically,each transformed prior austenite grain contains martensite laths that have all of the 24 distinct variants of the Kurdjumov-Sachs ( KS ) orientation relation.These are organized into 4 distinct packets,each of which contains laths in the 6 KS variants that share a common ” 111 ” γ = ” 110” α plane.The laths are organized into 3 distinct blocks,each of which is a composite mixture of the 2 KS variants of the packet that share a common Bain axis.The blocks are plates with habit planes very near ” 110”α;their boundaries are 120° twist boundaries about the common < 110 > α axis.While complex,this microstructural pattern can be understood and predicted by applying the Khachaturyan theory of dislocated martensite;it is the structure that minimizes elastic energy both during the transformation and in the final state of the transformed,polygranular body.
dislocated martensitic steel martensitic transformation microstructure
Morris J W Jr Kinney C QI Liang Pytlewski K R Khachaturyan A G
Department of Materials Science and Engineering,University of California,Berkeley,CA 94720,USA Department of Materials Science and Engineering,University of California,Berkeley,CA 94720,USA;Depar
国内会议
上海
英文
1-6
2013-06-01（万方平台首次上网日期，不代表论文的发表时间）