%0 Journal Article
%T MORPHOLOGY AND SUBSTRUCTURE OF JUJUBE-STONE-LIKE MARTENSITE IN ULTRAHIGH CARBON STEEL<br>超高碳钢中枣核状马氏体形态及亚结构
%A ZHANG Zhanling School of Materials Science
%A Engineering
%A Henan University of Science
%A Technology
%A Luoyang LIU Yongning
%A YU Guang
%A ZHU Jiewu
%A HE Tao State Key Laboratory for Mechanical Behavior of Materials
%A Xi''an Jiaotong University
%A Xi''an
%A <br>张占领
%A 柳永宁
%A 于光
%A 朱杰武
%A 何涛
%J 金属学报
%D 2009
%I 
%X In the martensitic transformation of an ultrahigh carbon steel (UHCS) containing 1.58%C, a kind of jujube-stone-like martensite has been observed in addition to lath and twinning martensites. The substructure of the jujube-stone-like martensite is high density dislocation with 1013/cm2 and no twin has been found. Theoretical analysis based on a disc-like martensite grain shows that the strain energy is not relative to the critical thickness of the disc (2t0*) but relative to the critical diameter of the disc (2r0*), and the critical nucleation energy ΔG* is inversely related to the square of the critical aspect ratio, t0*/r0*, of martensitic grains. When t0*/r0*<1, martensitic nucleus is disc shape, t0*/r0*>1, the nucleus is jujube--stone--like and t0*/r0*>>1, the nucleus is rod shape.
%K ultrahigh carbon steel
%K martensite transformation
%K martensite morphology
%K dislocation
%K twinning
%K carbide<br>超高碳钢
%K 马氏体相变
%K 马氏体形态
%K 位错
%K 孪晶
%K 碳化物
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=5B3AB970F71A803DEACDC0559115BFCF0A068CD97DD29835&cid=AB188D3B70B071C57EB64E395D864ECE&jid=B061E1135F1CBDEE96CD96C109FEAD65&aid=CED31BEEDF3455FD6084381C7EB89416&yid=DE12191FBD62783C&vid=94E7F66E6C42FA23&iid=38B194292C032A66&sid=5D8C08279A19B0D4&eid=03E56C113B4E5A88&journal_id=0412-1961&journal_name=金属学报&referenced_num=0&reference_num=20