P含量对Inconel 706合金凝固过程中(Laves+γ)共晶反应的影响  

EFFECTS OF P CONTENT ON(LAVES+γ) EUTECTIC REACTION DURING INCONEL 706 ALLOY SOLIDIFICATION

作　　者：信昕[1,2] 黄爱华[3] 祁峰[2] 张伟红[2] 刘芳[2] 杨洪才[1] 孙文儒[2] 胡壮麒[2] 

机构地区：[1]东北大学材料与冶金学院,沈阳110819 [2]中国科学院金属研究所,沈阳110016 [3]沈阳黎明发动机(集团)责任有限公司,沈阳110043

出　　处：《金属学报》2010年第7期873-878,共6页Acta Metallurgica Sinica

摘　　要：研究了P对Inconel 706合金元素偏析和铸态组织的影响.结果表明,P在合金凝固过程中显著地偏聚于剩余液相中,并促进Nb和Ti等元素的偏聚,从而促进富Nb的Laves相和富Ti的η-Ni3Ti相析出;含0.004%P(质量分数)的Inconel 706合金枝晶间析出细小的(Laves+γ)共晶和少量针状η-Ni3Ti相;P含量超过0.016%以后,枝晶间析出块状Laves相,Laves相颗粒之间析出大量密集的η-Ni3Ti板条;此外,P含量由0.004%升高至0.016%,Laves相的初熔温度由1170—1180℃之间下降至1160—1170℃之间.分析认为,高度富集于剩余液相中的P强烈阻碍γ相的析出,因此,P含量增加使合金的终凝温度降低,而且导致合金的凝固结束反应由(Laves+γ)共晶转化为先析出富P的Laves相再析出γ基体的离异共晶反应.The effects of P on elemental segregation and as-cast microstructure in Inconel 706 alloy were investigated in this paper.The results showed that P was markedly enriched in residual liquid and enhanced the segregation of Nb and Ti,which promoted the precipitation of Nb-enriched Laves phase and Ti-enrichedη-Ni_3Ti phase.In the as-cast alloy doped with 0.004% P（mass fraction）,fine（Laves＋γ）eutectic and needle likeηphase were formed in interdendritic region.As the P dopant was higher than 0.016%,blocky Laves phase was formed and lathηparticles were precipitated among Laves particles.Moreover,with P increasing from 0.004%to 0.016%,the incipient melting-point was found to drop from 1170—1180℃to 1160—1170℃.In high P-doped alloys,the enrichment of P in the residual liquid was believed to hinder the solidification of 7 phase, as a result,the final solidification temperature was found to be decreased and the solidification was terminated by the solidification ofγphase prior to the formation of P-bearing Laves phase rather than forming the（Laves＋γ）eutectic.

关 键 词：INCONEL 706合金 P含量 凝固组织 偏析 

分 类 号：TG132.32[一般工业技术—材料科学与工程]