B对高W镍基高温合金凝固行为的影响  

Effect of Boron on Solidification of High W Nickel-base Superalloy

作　　者：张磊[1] 祁峰[1] 张伟红[1] 信昕[1] 孙文儒[1] 

机构地区：[1]中国科学院金属研究所,辽宁沈阳110016

出　　处：《热加工工艺》2011年第23期33-37,共5页Hot Working Technology

摘　　要：研究了B对一种高W镍基高温合金凝固行为的影响。结果表明,B阻碍了枝晶的长大,增加中心等轴晶晶区,细化铸锭晶粒;同时B加剧了合金中Nb,Ti,W等元素的偏析,抑制了凝固过程中η相的析出,使MC析出形态由长条状变为块状。The effect of boron on the solidification of a high W nickel-base superalloy was investigated. The results show that boron restrains the growth of dentrites, increases the equiaxed grain area at the center of the ingot and refine the grain; boron is also found to enhance the segregation of elements such as Nb, Ti, W, hinder the precipitation of η phase during the solidification, change the morphology of MC from long strips to massive.

关 键 词：高温合金 凝固 W B 

分 类 号：TG139[一般工业技术—材料科学与工程]