Twinned substructure in lath martensite of water quenched Fe-0.2%C and Fe-0.8%C steels  

作　　者：Haidong Sun Yuhui Wang Zuohua Wang Ning Liu Yan Peng Xiujuan Zhao Ruiming Ren Hongwang Zhang 

机构地区：[1]National Engineering Research Center for Equipment and Technology of Cold Strip Rolling,College of Mechanical Engineering,Yanshan University,Qinhuangdao,066004,China [2]Liren College of Yanshan University,Yanshan University,Qinhuangdao,066004,China [3]School of Materials Science&Engineering,Dalian Jiaotong University,Dalian,116028,China

出　　处：《Journal of Materials Science & Technology》2020年第14期126-132,共7页材料科学技术（英文版）

基　　金：supported financially by the Hundred Outstanding Creative Talents Projects in Hebei University,China;the Project Program of Heavy Machinery Collaborative Innovation Center,the National Natural Science Foundation(Grant No.51231006,51171182 and 51471039)。

摘　　要：In the present investigation,twinned substructures within lath martensite of two water quenched steels(0.2 wt.%C and 0.8 wt.%C)were studied.The lath martensite has typical hierarchical packet-block-lath with dislocation substructure.Besides,laths that are misoriented by<011>/70.5°or<111>/60° and bordered by{011}plane,namely twinned laths,are observed,of which the density increases and the scale decreases as more carbons were presented.Such twinned laths have body centered cubic(bcc)crystal structure,belonging to twinned variants following the classical Kurdjumov-Sachs(K-S)orientation relationship with respect to the parent austenite.Unlike bcc{112}<111>twins,twinned variants produce strong double diffraction and in turn the extra diffraction spots that are commonly observed in the martensite in steels with wide range of carbon contents.

关 键 词：Twinned variant Lath martensite Double electron diffraction Orientation relationship STEELS 

分 类 号：TG142.1[一般工业技术—材料科学与工程]