您目前所在的位置:首页 - 期刊简介 - 详细页面

铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 2    No. 4    November 1992

[PDF Download]    [Flash Online]

    

ALLOY MORPHOLOGY UNDER SUPERHIGH SPEED DIRECTIONAL SOLIDIFICATION
Chu Shuangjie , Li Jianguo , Liu Zhongyuan ,Shi Zhengxing , Fu Hengzhi

Northwestern Polytechnical University,Xi’an 710072, China

Abstract:This paper explains the principle of a newly developed ZMLMC directional solidification apparatus with a superhigh temperature gradient. With the help of the apparatus, research was done on the比ange of directional solidification structures of the cobalt based superalloy K 10 at superhigh velocities. Relations between the primary and secondary dendrite arm spacings and the cooling rates Were investigated. Ezperimental results show that the primary and secondary dendrite arm spacings of directionally solidified cobalt based superalloys are respectively finer than one fifth and one eighth of those produced by conventional directional soli- dification proceases. The primary and secondary dendrite arm spacing which can be decreased by increasing the cooling rate,and the relations between these spacings (λ1 , λ2) and the temperature gradient (G) and solidfication rate(v)were as follows: λ1= 1.428 ×103(G·v)-1, λ2=0.132× 103(G·v)-1.

 

Key words: superhigh speed directional solidification  superalloy  dendrite arm spacing

ISSN 1672-7029
CN 43-1423/U

主管:中华人民共和国教育部 主办:中南大学 中国铁道学会 承办:中南大学
湘ICP备09001153号 版权所有:《铁道科学与工程学报》编辑部
------------------------------------------------------------------------------------------
地 址:湖南省长沙市韶山南路22号 邮编:410075
电 话:0731-82655133,82656174   传真:0731-82655133   电子邮箱:jrse@mail.csu.edu.cn