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金属学报  2010, Vol. 46 Issue (7): 873-878    DOI: 10.3724/SP.J.1037.2010.00038
  论文 本期目录 | 过刊浏览 |
P含量对Inconel 706合金凝固过程中(Laves+γ)共晶反应的影响
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)
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
EFFECTS OF P CONTENT ON (LAVES+γ) EUTECTIC REACTION DURING INCONEL 706 ALLOY SOLIDIFICATION
XIN Xin1, 2), HUANG Aihua3), QI Feng2), ZHANG Weihong2),  LIU Fang2) ,YANG Hongcai1), SUN Wenru2) , HU Zhuangqi2)
1) School of Materials and Metallurgy, Northeastern University, Shenyang 110819
2) Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016
3) Shenyang Liming Aero--Engine Group Corporation, Shenyang 110043
引用本文:

信昕 黄爱华 祁峰 张伟红 刘芳 杨洪才 孙文儒 胡壮麒. P含量对Inconel 706合金凝固过程中(Laves+γ)共晶反应的影响[J]. 金属学报, 2010, 46(7): 873-878.
, , , , , , , . EFFECTS OF P CONTENT ON (LAVES+γ) EUTECTIC REACTION DURING INCONEL 706 ALLOY SOLIDIFICATION[J]. Acta Metall Sin, 2010, 46(7): 873-878.

全文: PDF(871 KB)  
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.

关键词 Inconel 706合金P含量凝固组织偏析    
Abstract

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-enriched η-Ni3Ti phase. In the as-cast alloy doped with 0.004% P (mass fraction), fine (Laves+γ) eutectic and needle like $\eta$ phase were formed in interdendritic region. As the P dopant was higher than 0.016%, blocky Laves phase was formed and lath η particles 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 γ phase, as a result, the final solidification temperature was found to be decreased and the solidification was terminated by the solidification of γ phase prior to the formation of P-bearing Laves phase rather than forming the (Laves+γ) eutectic.

Key wordsInconel 706 alloy    P content    solidified microstructure    segregation
收稿日期: 2010-01-09     
作者简介: 信 昕, 男, 1978年生, 博士生

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