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半固態(tài)高鉻鑄鐵的流變鑄造組織的演變
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TG143.1 TG249

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國家自然科學(xué)基金項目(59995440)


Evolution of Rheocast Structure of High Chromium White Iron
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    摘要:

    通過研究攪拌強度,冷卻速度對高鉻鑄鐵流變鑄造組織的影響及采用EMPA和EBSD技術(shù)研究小角晶界,晶粒簇叢的精細(xì)特征,發(fā)現(xiàn)冷卻速度控制了枝晶臂所受扭矩大小與根部直徑大小的比例,適當(dāng)?shù)睦鋮s速度可促進(jìn)形成頭部大,根部小的枝晶臂的形成,從而加速枝晶臂的折斷。聚集的小角晶界是扭折但未完全折斷的細(xì)小枝晶臂在經(jīng)熟化過程后形成的主干與枝晶臂的界面,晶粒簇叢是由許多被扭折的枝晶臂演變而成。

    Abstract:

    The effect of stirring strength and t he cooling rate on the rheocast structure of a high chromium white iron were studied.The characteristics of the special low a ngle subgrain boundaries and agglom eration of subgrains were analyzed b y EPMA and EBSD technique.It was found that the cooling rate decid es the ratio of the stress on the dendr ite arm to the diameter of the dendrite root.A proper cooling rate favers the formation of dendrite arm s with big head and thin root and accelerates the breaking of the dendrite a rms.The clustered special subgrain boudaries are the boundaries between the stem and ripened dendr ite arms.The agglomerations of the s ubgrains were indeed evolved from the bent dendrite arms with big h ead and thin root.

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楊昭 張海峰 等.半固態(tài)高鉻鑄鐵的流變鑄造組織的演變[J].稀有金屬材料與工程,2003,(1):23~26.[Yang Zhao, Zhang Haifeng, Wang Aimin g, Ding Bingzhe, Hu Zhuangqi. Evolution of Rheocast Structure of High Chromium White Iron[J]. Rare Metal Materials and Engineering,2003,(1):23~26.]
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  • 最后修改日期:2002-06-20
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