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改造Ti-24Al-15Nb-1.5Mo/TC11雙合金焊縫組織與增強連接界面性能的工藝
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國家自然科學(xué)基金資助(50775187)


Craft of Improving Microstructure and Properties of Ti-24Al-15Nb-1.5Mo/TC11
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    摘要:

    研究近等溫鍛造+梯度熱處理工藝對Ti-24Al-15Nb-1.5Mo/TC11雙合金焊接接頭的顯微硬度變化、合金元素擴散趨勢、顯微組織特征和拉伸性能的影響。結(jié)果表明：近等溫鍛造+梯度熱處理能使焊接接頭得到強化。經(jīng)近等溫鍛造和梯度熱處理后焊縫熔合區(qū)形成的馬氏體α′和α″相分解為α(α2)+β的平衡組織；TC11合金熱影響區(qū)的魏氏組織轉(zhuǎn)變?yōu)榫W(wǎng)籃組織；試樣具有良好的500 ℃高溫綜合性能(σb: 840 MPa，δ: 18.5%，ψ: 65%)

    Abstract:

    The effect of near isothermal forging and gradient heat treatment on the micro-hardness distribution, the trend of elements diffusion, the microstructure and tensile property have been investigated for the welding Ti-24Al-15Nb-1.5Mo/TC11 dual alloys joint. The results show that the joint can be strengthened through near isothermal forging and gradient heat treatment. During heat working, the martensite a’ phase and a2 phase in fusion zone of joint are breaken up into a balance microstructure consisting of a (a2) phase + b phase. The Widmanstatten structure changes into the basket weave structure in the alloy TC11 heat-affected zone of joint. In addition, the joint has excellent high temperature properties after near isothermal deformation and gradient heat treatment (sb is 840 MPa, d is 18.5%, and y is 65%)

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高 峻,姚澤坤,劉瑩瑩,郭鴻鎮(zhèn),楊航航.改造Ti-24Al-15Nb-1.5Mo/TC11雙合金焊縫組織與增強連接界面性能的工藝[J].稀有金屬材料與工程,2009,38(11):2043~2047.[Gao Jun, Yao Zekun, Liu Yingying, Guo Hongzhen, Yang Hanghang. Craft of Improving Microstructure and Properties of Ti-24Al-15Nb-1.5Mo/TC11[J]. Rare Metal Materials and Engineering,2009,38(11):2043~2047.]
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  • 收稿日期:2008-11-09
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