起始端工艺对某高温合金定向组织中斜晶的影响  

Effect of Initial Conditions on Misorientations in Columnar Grains of a Superalloy

作　　者：税国彦[1] 苏贵桥[1] 杨大鹏 李长春[1] 刘孝福[1] 孙逊[1] 于波[1] 

机构地区：[1]沈阳铸造研究所,辽宁沈阳110022 [2]海装重庆局,四川成都610100

出　　处：《铸造》2013年第7期616-619,共4页Foundry

基　　金："高档数控机床与基础制造装备"科技重大专项2011ZX04014-052;"高档数控机床与基础制造装备"科技重大专项2012ZX04007-021

摘　　要：研究了板状试样的液态金属冷却定向组织中斜晶的形成过程。结果表明:定向试样起始端晶粒数目少(3个/cm,表面宽度方向),试样中容易出现斜晶;定向试样起始端晶粒数目足够多时(10个/cm,表面宽度方向),在抽拉开始到试样与锡液接触之前的过程中,如果抽拉速率过大,定向组织中同样会形成斜晶。Study on the formation ofmisoriented grains in the columnar grains of plate samples made by using of liquid-metal cooling （LMC） assisted directionally solidifying has been carried out. The experimental results show that misorientations appear when there are few grains formed at the bottom of the samples. However, when lots of grains formed at the bottom of the samples, misorientations will also appear if the samples are withdrawn fast before they touch the surface of the liquid tin.

关 键 词：液态金属冷却 斜晶 抽拉速率 起始端工艺 

分 类 号：TG132.32[一般工业技术—材料科学与工程]