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熱加工歷史對(duì)Ti-24Al-15Nb-1.5Mo/TC11雙合金盤(pán)
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Action of Hot Working History on Microstructure and Properties of Welding Interface of Ti-24Al-15Nb-1.5Mo/TC11 Dual Alloy Disc
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    摘要:

    采用電子束焊連接，隨后近等溫鍛造＋梯度熱處理的工藝加工Ti-24Al-15Nb-1.5Mo /TC11雙合金盤(pán)，通過(guò)OM、SEM、TEM、XRD等研究雙合金盤(pán)的焊接界面狀況。結(jié)果表明，經(jīng)此工藝加工的Ti-24Al-15Nb-1.5Mo /TC11雙合金盤(pán)的高溫拉伸性能較優(yōu)，焊縫的高溫強(qiáng)度大于TC11鈦合金，但室溫拉伸性能分散度較大。采用梯度熱處理不能消除經(jīng)50%變形的雙合金盤(pán)的焊縫到TC11側(cè)熱影響區(qū)的晶界相。焊縫區(qū)簇狀2相的形成與在近等溫鍛造、梯度熱處理加熱保溫過(guò)程中Al、Nb元素從2相中分離出來(lái)有關(guān)

    Abstract:

    The Ti-24Al-15Nb-1.5Mo/TC11 dual alloy discs were joined by electron beam welding firstly, and then underwent near isothermal forging and gradient heat treatment. The welding interface state was investigated by OM, SEM, TEM and XRD. The results show that the elevated temperature properties of the dual alloy disc are better and the high temperature strength is larger than that of the TC11 alloy. However, the dispersion degree of tensile properties is larger at the room temperature. When the dual alloy disc is deformed by 50%, the α phase is distributed in the β phase grain boundary from welding seam to the heat-affected zone of TC11 alloy, which can not be eliminated by gradient heat treatment. The cluster α2 phase in the welding seam area is formed, which is ascribed to the diffusion of the Al and Nb elements from the α2 phase during near isothermal forging and gradient heat treatment.

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劉瑩瑩,姚澤坤,楊航航,秦 春,郭鴻鎮(zhèn).熱加工歷史對(duì)Ti-24Al-15Nb-1.5Mo/TC11雙合金盤(pán)[J].稀有金屬材料與工程,2010,39(2):362~366.[Liu Yingying, Yao Zekun, Yang Hanghang, Qin Chun, Guo Hongzhen. Action of Hot Working History on Microstructure and Properties of Welding Interface of Ti-24Al-15Nb-1.5Mo/TC11 Dual Alloy Disc[J]. Rare Metal Materials and Engineering,2010,39(2):362~366.]
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  • 收稿日期:2009-03-01
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