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Nb、Al含量對GH706合金組織及力學性能的影響
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Effects of Al and Nb Content on Microstructure and Properties of GH706 Alloy
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    摘要:

    研究了降Nb提Al對GH706合金組織和力學性能的影響。當合金中Al含量由0.35%提高至1.26% (質(zhì)量分數(shù), 下同)，Nb含量由2.88%降低至1.98%后，可抑制晶內(nèi)主要強化相γ″-Ni3Nb相的析出，促進γ′-Ni3Al相的析出，顯著降低合金的室溫屈服強度，但明顯改善了合金的室溫沖擊性能。同時提Al降Nb還抑制了晶界強化相η-Ni3(Ti, Nb)相的析出，使得富Nb的Laves相及富Nb、Cr的Cr2Nb相析出，弱化了高溫下的晶界強度，極大地惡化了合金的持久性能

    Abstract:

    The effects of increasing Al and decreasing Nb on microstructure and mechanical properties of GH706 alloy were studied. With increasing Al from 0.35% to 1.26% and decreasing Nb from 2.88% to 1.98%, the precipitation of γ″-Ni3Nb phase is constrained, while the formation of γ′-Ni3Al phase is promoted. As a result, the tensile strength at room temperature is decreased, but the impact energy is improved. However, such a modification of Al and Nb constrains the precipitation of intergranular η-Ni3(Ti,Nb) phase, and enhances the precipitation of Laves phase rich in Nb and Cr2Nb phase rich in Nb and Cr, which decreases the grain boundary cohesion and deteriorates the stress rupture properties at 650 oC and 690 MPa

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信 昕,孫文儒,段忠園,祁 峰,張偉紅,劉 芳,楊洪才,胡壯麒. Nb、Al含量對GH706合金組織及力學性能的影響[J].稀有金屬材料與工程,2011,40(11):1946~1950.[Xin Xin, Sun Wenru, Duan Zhongyuan, Qi Feng, Zhang Weihong, Liu Fang, Yang Hongcai, Hu Zhuangqi. Effects of Al and Nb Content on Microstructure and Properties of GH706 Alloy[J]. Rare Metal Materials and Engineering,2011,40(11):1946~1950.]
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  • 收稿日期:2010-11-24
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