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Ni-Cr-Al合金中Cr、Al含量對熱加工性的影響
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國家自然科學基金項目（50771011）


Effects of Cr and Al Contents on Hot Workability of Ni-Cr-Al Alloys
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    摘要:

    Ni-Cr-Al系高溫合金作為一種常用的新型航空發(fā)動機密封材料，通過調(diào)整Cr、Al含量可以提高耐高溫及熱腐蝕性能，但同時也會影響合金的熱加工性。通過熱模擬壓縮試驗，分析了Cr，Al含量分別在15%~25%，4%~5%（質(zhì)量分數(shù)，下同）范圍調(diào)整時，對合金高溫變形特性的影響規(guī)律。結(jié)果表明，Cr、Al含量的提高會不同程度縮小合金的安全熱加工區(qū)域。通過熱力學平衡相計算和組織觀察發(fā)現(xiàn)，成分變化影響熱加工性的主要原因是晶界胞狀碳化物的形態(tài)及析出量變化。綜合考慮熱變形試驗、組織觀察結(jié)果以及耐高溫腐蝕的因素，20%Cr和4%Al是比較合適的成分選擇。

    Abstract:

    Ni-Cr-Al superalloys are widely used as sealing materials in new type aero-engines. Though Cr and Al contents can improve the resistance of high temperature oxidation and hot corrosion, it can affect the hot workability of alloys at the same time. The effects of Cr and Al contents (Cr, 15%-25%; Al, 4%-5%, mass fraction) on the hot workability were studied by isothermal compressive deformation at deformation temperatures of 1000 oC to 1200 oC and strain rates of 0.1, 1, 5 and 20 s-1. The results indicate that increasing of Cr or Al content can reduce the safe region of hot working to different extents. Equilibrium phase diagrams and microstructure observation show that the effects of Cr and Al contents on hot workability is mainly caused by the morphology and fraction differences of cellular carbide in grain boundary. Considering the hot workability, microstructure change and corrosion resistance at high temperature, it is concluded that 20%Cr and 4%Al is the best component for sealing materials of Ni based superalloys.

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畢中南,董建新,張麥倉,鄭 磊,章清泉. Ni-Cr-Al合金中Cr、Al含量對熱加工性的影響[J].稀有金屬材料與工程,2010,39(11):1938~1942.[Bi Zhongnan, Dong Jianxin, Zhang Maicang, Zheng Lei, Zhang Qingquan. Effects of Cr and Al Contents on Hot Workability of Ni-Cr-Al Alloys[J]. Rare Metal Materials and Engineering,2010,39(11):1938~1942.]
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  • 收稿日期:2009-11-25
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