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| 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 |
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Cite this article:
XIN Xin HUANG Aihua QI Feng ZHANG Weihong LIU Fang YANG Hongcai SUN Wenru HU Zhuangqi . EFFECTS OF P CONTENT ON (LAVES+γ) EUTECTIC REACTION DURING INCONEL 706 ALLOY SOLIDIFICATION. Acta Metall Sin, 2010, 46(7): 873-878.
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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.
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Received: 09 January 2010
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