EFFECTS OF P CONTENT ON (LAVES+γ) EUTECTIC REACTION DURING INCONEL 706 ALLOY SOLIDIFICATION
Received date: 2010-01-09
Revised date: 2010-04-07
Online published: 2010-07-11
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 words： Inconel 706 alloy; P content; solidified microstructure; segregation
XIN Xin , XUN Wen-Ru , YANG Hong-Cai , ZHANG Wei-Hong , LIU Fang , HU Zhuang-Qi , ZHI Feng , HUANG Ai-Hua . EFFECTS OF P CONTENT ON (LAVES+γ) EUTECTIC REACTION DURING INCONEL 706 ALLOY SOLIDIFICATION[J]. Acta Metall Sin, 2010 , 46(7) : 873 -878 . DOI: 10.3724/SP.J.1037.2010.00038
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