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首页> 外文期刊>Journal of Materials Research >Influence of solidification rate on precipitation and microstructure of directional solidification IN792 + Hf superalloy
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Influence of solidification rate on precipitation and microstructure of directional solidification IN792 + Hf superalloy

机译：凝固速率对定向凝固IN792 + Hf超合金的析出和组织的影响

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摘要

The effect of solidification rate on the precipitation and microstructure of directional solidification IN792 + Hf alloy was studied. The solidification sequence and the initial precipitation temperature of different phases were determined by the observation of the quenched microstructure combined with the differential thermal analysis measurement. The script carbide was turned into faceted carbide with the drop of solidification rate. It was concluded by microstructure analysis that the faceted carbide was pushed by the γ solid front before it was captured. The incorporation of γ phase into the faceted carbide was due to the dendrite growth of the carbide toward one point and the mergence of the dendrites. Some long carbide bars were formed along the grain boundaries by continual reaction of eutectic (γ + MC carbide) at a solidification rate of 0.5 mu m/s. Two zones, the γ forming elements enriched zone and depleted zone, were found in the residual liquid area. Eutectic γ/γ nucleated in the γ forming elements enriched zone. The n-phase precipitation was controlled by the ratio of (Ti + Hf + Ta + W)/Al in the residual liquid. The growth of eutectic γ/γ increased the ratio and induced the n-phase precipitation. A lower solidification rate decreased the ratio by sufficient diffusion and hence efficiently suppressed the n-phase precipitation.
机译：研究了凝固速率对定向凝固IN792 + Hf合金的析出和组织的影响。通过观察淬火的显微组织并结合差示热分析测量来确定不同相的凝固顺序和初始沉淀温度。随着凝固速率的降低，脚本碳化物变成多面碳化物。通过微观结构分析得出结论，多面碳化物在被捕获之前就被γ固体前沿推动。 γ相结合到多面碳化物中是由于碳化物向一个点的枝晶生长和枝晶的合并。通过共晶（γ+ MC碳化物）以0.5μm / s的凝固速度连续反应，沿晶界形成了一些长的碳化物棒。在残留液体区域中发现了两个区域，即γ形成元素富集区和耗尽区。共晶γ/γ在γ形成元素富集区中成核。通过残余液体中（Ti + Hf + Ta + W）/ Al的比例控制n相沉淀。共晶γ/γ的生长增加了该比率并诱导了n相沉淀。较低的凝固速率通过充分的扩散降低了比率，因此有效地抑制了n相沉淀。

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