C含量對第二代單晶高溫合金組織的影響

C含量對第二代單晶高溫合金組織的影響Effect of C Content on Microstructure of Second Generation Single Crystal Superalloy

在高溫度梯度真空定向凝固爐中，制備不同C含量的單晶高溫合金，研究不同C含量對第二代單晶高溫合金顯微組織的影響。結(jié)果表明：C含量對合金枝晶間距的影響較??；隨著C含量增加，共晶含量和尺寸減小，碳化物含量增加，其形貌由塊狀向骨架狀、漢字狀轉(zhuǎn)變；隨著C含量增加，Ta元素枝晶偏析減輕，Re，W，Mo，Nb元素枝晶偏析加重；C含量對鑄態(tài)和熱處理γ'相尺寸和形貌影響較??；熱處理后碳化物的形貌無明顯變化。

The single crystal superalloy with different C contents was casted using master alloy of DD6 in the directionally solidified furnace. The effect of C content on the microstructure of the second generation single crystal superalloy was investigated. The results show that C content has no obvious effect on the dendrite arm spacing. With the increase of C content, the volume fraction and size of γ/γ' eutectic decrease. However, the volume fraction of carbide increases, and its morphologies change from blocky shape to frame work-like and Chinese-script-like with the increase of C content. With the increase of carbon content, the segregation of Ta decreases while the segregation of Re, W, Mo, Nb increases. C content has no obvious effect on the shape and size of γ' phase in as cast microstructure or after heat treatment. The morphology of carbide has no distinct change after heat treatment.

全文下載：https://pan.baidu.com/s/1jIQKXyY