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梯度熱處理對(duì)Ti3Al/TC11雙合金焊接界面組織和顯微硬度的影響
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Influence of Gradient Heat Treatment on Microstructure and Microhardness in Weld Seam of Ti3Al/TC11 Dual Alloys
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National Natural Science Foundation of China (50775187)

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    摘要:

    研究經(jīng)近等溫變形的Ti3Al/TC11雙合金在梯度熱處理前后,焊接界面顯微組織和顯微硬度的變化。結(jié)果表明，Ti3Al側(cè)熱影 響區(qū)的顯微組織在梯度熱處理前后變化較小是因?yàn)榫Ы绂?相較穩(wěn)定；焊縫區(qū)顯微組織變化較大，究其原因是近等溫變形造成的晶粒破碎和Ti、Al、Nb等原子的擴(kuò)散，造成α、α2相互制衡，致使不能形成連續(xù)晶界α2或晶界α；TC11合金基體經(jīng)過梯度熱處理后從網(wǎng)籃組織轉(zhuǎn)變成等軸組織；顯微硬度的提高是因?yàn)門i、Al、Nb擴(kuò)散，造成α、α2尺寸小、彌散分布所致。

    Abstract:

    The changes of the microstructure and the microhardness at the weld interface of near isothermally forged Ti3Al/TC11 dual alloys before and after gradient heat treatment were investigated. The results indicate that the stability of α2 phase and distribution in the grain boundary results in slight changes of microstructures at heat-affected zone on Ti3Al side, but the changes of the microstructure in the weld zone are relatively obvious due to the diffusions of elements such as Ti, Al, Nb and so on. Because growing-up of the α and α2 phase is restricted each other, the continual α or α2 phase grain boundary can not be formed. After gradient heat treatment, the matrix microstructure of the TC11 alloy changes from basketweave structure to equiaxed structure. Because of the diffusions of Ti, Al and Nb, the sizes of α and α2 phases become small and their distribution become dispersive, resulting in the increase in microhardness.

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楊航航,姚澤坤,高 峻,郭鴻鎮(zhèn),劉瑩瑩,王 敏.梯度熱處理對(duì)Ti3Al/TC11雙合金焊接界面組織和顯微硬度的影響[J].稀有金屬材料與工程,2010,39(1):22~26.[Yang Hanghang, Yao Zekun, Gao Jun, Guo Hongzhen, Liu Yingying, Wang Min. Influence of Gradient Heat Treatment on Microstructure and Microhardness in Weld Seam of Ti3Al/TC11 Dual Alloys[J]. Rare Metal Materials and Engineering,2010,39(1):22~26.]
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  • 收稿日期:2009-01-15
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