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TiAl基合金在快速加熱循環(huán)熱處理過程中的結(jié)構(gòu)失穩(wěn)
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TG146

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國家“863”高技術(shù)計劃資助項目(715-005-0040)


Microstructural Instability of A TiAl-Based Alloy during Rapid Heating Cyclic Heat Treatment
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    摘要:

    觀察了快速加熱循環(huán)熱處理過程中發(fā)生的4種結(jié)構(gòu)失穩(wěn)現(xiàn)象：形成二次層片組織、原始層片球化、晶界處非連續(xù)粗化、相界形核。通過比較連續(xù)加熱與等溫加熱條件下的相轉(zhuǎn)變開始線，探討了連續(xù)加熱與等溫加熱條件下結(jié)構(gòu)失穩(wěn)機制的異同。提出了快速加熱循環(huán)熱處理過程中避免結(jié)構(gòu)失穩(wěn)的途徑：確保合金成分均勻，使各區(qū)域相變溫度一致；使最高溫度下的保溫時間盡可能短。

    Abstract:

    Four kinds of microstructural instability of a TiAl-based alloy during rapid heating cyclic heat treatment were observed: (i) the formation of secondary lamellae, (ii) the spheroidization of primary lamellae, (iii) a discontinuous coarsening at grain boundaries and (iv) nucleation at phase interfaces. By comparing the starting line of continuous heating transformation with that of TTT diagram, the similarity and difference of the microstructure instability during continuous heating and isothermal heating conditions were studied. Ways of avoiding unfavorable microstructural instability were proposed such as: (i) insuring homogeneity of the composition so as to guarantee the identity of transformation temperature in the alloy; (ii) holding at the highest temperature for as short a time as possible.

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彭超群 黃伯云. TiAl基合金在快速加熱循環(huán)熱處理過程中的結(jié)構(gòu)失穩(wěn)[J].稀有金屬材料與工程,2004,33(4):363~367.[Peng Chaoqun, Huang Baiyun. Microstructural Instability of A TiAl-Based Alloy during Rapid Heating Cyclic Heat Treatment[J]. Rare Metal Materials and Engineering,2004,33(4):363~367.]
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  • 最后修改日期:2003-04-11
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