%0 Journal Article
%T DEPENDENCE OF MICROSTRUCTURE SCALES OF EUTECTICS ON Ca-Si MODIFIER AMOUNT IN AUSTENITE STEEL COMPOSITES
%A GFLiang
%A <br>G.F.Liang
%A Z.M.Xu
%A Q.C.Jiang
%A J.G.Li
%J 金属学报(英文版)
%D 2004
%I 
%X Results presented in this paper contribute to investigation of the effect of the added Ca-Si modifier amount (αk) on the microstructure scales of granular γ-(Fe, Mn)3C eutectics such as the volume fraction (39 and diameter (d) in the austenite steel matrix composites (EAMC).Directional solidification of EAMC has been carried out using vertical Bridgman method at 50.6μms^-1 with a constant temperature gradient about 800Kcm^-1. The higher constitutional supercooling ahead of solid-liquid interface attributing to the larger αk results in the enlargement of γ-(Fe, Mn)3C coupled-zone and the increment of the nucleation rate of eutectics. Therefore, f increases with increasing αk. The branches of the primary austenite dendrites develop more greatly as αk increases, which limits the growth of eutectics. As a result, d decreases with increasing αk.
%K austenite steel
%K eutectic
%K microstructure
%K directional solidification<br>微观结构
%K 奥氏体钢
%K Ca
%K Si
%K 共晶
%K 定向凝固
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=5B3AB970F71A803DEACDC0559115BFCF0A068CD97DD29835&cid=AB188D3B70B071C57EB64E395D864ECE&jid=C19B08D052F5FD8445F4BB80A1A5D7BF&aid=7EE464B12AA859491BF2674A3F254B38&yid=D0E58B75BFD8E51C&vid=BCA2697F357F2001&iid=94C357A881DFC066&sid=7004BE6E41AAF52C&eid=BBA8B1249CDAA6CE&journal_id=1006-7191&journal_name=金属学报(英文版)&referenced_num=0&reference_num=11