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超高溫度梯度下凝固速率對一種鎳基單晶高溫合金定向凝固組織的影響
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Directional Solidification of a Ni-Based Single Crystal Superalloy under High Temperature Gradient
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    摘要:

    采用區(qū)域熔煉液態(tài)金屬冷卻超高溫度梯度定向凝固法 (ZMLMC)，研究凝固速率對一種鎳基高溫合金微觀組織的影響。結(jié)果顯示：在溫度梯度基本不變的條件下，隨著凝固速率的提高，枝晶結(jié)構(gòu)逐漸細化，一次枝晶間距λ1與二次枝晶間距λ2減小，且λ1和λ2分別與V-1/4和V-1/2呈線性關(guān)系；γ'相尺寸隨凝固速率的提高而減小，形貌逐漸趨向于立方狀，而在同一速率下，枝晶干的γ'相形狀相對較規(guī)則，接近立方形，枝晶間的γ'相則趨于無規(guī)，其尺寸也較枝晶干區(qū)域更為粗大；γ/γ'共晶尺寸隨凝固速率的提高而減小，分布趨于彌散，但總的體積分數(shù)變化不大

    Abstract:

    The effects of solidification rate on the microstructure of a Ni-based superalloy were investigated by zoom melting liquid metal cooling (ZMLMC) unidirectional solidification. The temperature gradient was approximately constant. It is revealed that with the increase of solidification rate, the dendrite structure is refined, and both the primary dendrite spacing λ1 and the secondary dendrite spacing λ2 are reduced, they show a linear relationship with v-1/4 and v-1/2, respectively. The sizes of γ' precipitates decrease with increasing of solidification rate, and the shapes turn to be regular. At the same rate, the γ' phase in interdendrite area is larger and more irregular than that in dendrite area. The γ/γ' eutectic also becomes smaller and more dispersed with the increase of solidification rate, but the total volume proportion remains stable

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湯曉君,張永軍,李建國.超高溫度梯度下凝固速率對一種鎳基單晶高溫合金定向凝固組織的影響[J].稀有金屬材料與工程,2012,41(4):738~742.[Tang Xiaojun, Zhang Yongjun, Li Jianguo. Directional Solidification of a Ni-Based Single Crystal Superalloy under High Temperature Gradient[J]. Rare Metal Materials and Engineering,2012,41(4):738~742.]
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  • 收稿日期:2011-04-08
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