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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 effect of P on the segregation and as-cast microstructure of Inconel 706 alloy was investigated. The results show that P significantly segregates in the remaining liquid phase during the solidification of the alloy and promotes the segregation of Nb and Ti and other elements, (Laves + γ) eutectic and a small amount of needle-like η-Ni3Ti phase precipitated in the Inconel 706 alloy containing 0.004% P (mass fraction) After 0.016%, bulk Laves phase precipitates between the dendrites and a large amount of η-Ni3Ti slab is precipitated between the Laves phase particles. In addition, the content of P increases from 0.004% to 0.016% 1180 ℃ to 1160-1170 ℃ .The analysis shows that the highly enriched in the remaining liquid phase of P strongly hindered the precipitation of γ phase, therefore, the increase in the P content of the alloy to reduce the final setting temperature, and lead to the alloy At the end of the solidification reaction, the (Laves + γ) eutectic is transformed into the dissociation eutectic reaction of precipitating the γ matrix by precipitating the L-rich phases first.