Cu对K4169合金凝固过程及凝固偏析的影响

李亚敏; 胡伟; 陈毅

doi:10.15980/j.tzzz.2013.10.007

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Cu对K4169合金凝固过程及凝固偏析的影响
Effect of Copper on Solidification Process and Segregation in K4169 Superalloy
2013年33卷第10期页码：895-898
纸质出版日期： 2013 ，
DOI： 10.15980/j.tzzz.2013.10.007

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[1]李亚敏,胡伟,陈毅.Cu对K4169合金凝固过程及凝固偏析的影响[J].特种铸造及有色合金,2013,33(10):895-898.

Li Yamin, Hu Wei, Chen Yi. Effect of Copper on Solidification Process and Segregation in K4169 Superalloy[J]. Special Casting & Nonferrous Alloys, 2013,33(10):895-898.
[1]李亚敏,胡伟,陈毅.Cu对K4169合金凝固过程及凝固偏析的影响[J].特种铸造及有色合金,2013,33(10):895-898. DOI： 10.15980/j.tzzz.2013.10.007.

Li Yamin, Hu Wei, Chen Yi. Effect of Copper on Solidification Process and Segregation in K4169 Superalloy[J]. Special Casting & Nonferrous Alloys, 2013,33(10):895-898. DOI： 10.15980/j.tzzz.2013.10.007.

摘要

利用手工电弧炉熔炼制备了Cu含量为0

.5%的K4169合金

并采用X射线衍射、金相显微镜、扫描电镜、能谱仪以及差热分析

对合金的相组成、凝固组织、元素偏析及熔点进行了研究。结果表明

Cu是负偏析元素

主要富集于枝晶臂上;Cu的加入促进了合金中Nb、Mo、Fe等元素的偏析

使铸态合金晶界析出的Laves相和碳化物数量增多;同时Cu的加入降低了Laves相初熔温度与合金的熔点。分析认为

Cu对K4169合金凝固组织不利。

Abstract

K4169superalloy with different Cu contents from 0to 0.5%（weight percentage）was prepared by a manual electric arc furnace.The phase composition

solidification structure

segregation and the melting point of the superalloy prepared were observed by XRD（X-ray diffraction）

OM（optical microscope）

SEM（scanning electron microscope）

SEM-EDS and DSC.The results show that Cu is negative segregation element which mainly enriched at the dendrite arm

and it promotes the segregation of Nb

Mo and Fe

meanwhile

Cu promotes significantly the precipitation of Laves phase and MC carbide at the grain boundaries.In addition

the incipient melting temperature of Laves phase and the melting point of alloy are decreased with the Cu addition.The analysis shows that Cu is harmful to the solidification structure of K4169superalloy.