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固溶熱處理對新型鎳基粉末FGH98Ⅰ高溫合金組織與性能的影響
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國家武器裝備預(yù)研基金(9140A12070507QT0202) ；國家高技術(shù)研究發(fā)展計劃 (2007AA03A223)


Effect of Solution Heat Treatment on the Microstructure and Properties of a Novel Nickel-Based P/M Superalloy FGH98 I
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    摘要:

    對新型鎳基粉末高溫合金 (FGH98Ⅰ)在不同溫度下進行固溶熱處理, 采用熱力學(xué)相計算、光學(xué)顯微鏡、場發(fā)射掃描電鏡及化學(xué)相分析等研究了亞固溶和過固溶合金的析出相和顯微組織，并綜合分析了組織與性能的關(guān)系。結(jié)果表明: FGH98Ⅰ合金經(jīng)1130 ℃亞固溶和1190 ℃過固溶處理后的析出相均為γ＇、MC、M23C6和M3B2等，未發(fā)現(xiàn)TCP(拓撲密堆)相。FGH98Ⅰ合金亞固溶熱處理后晶粒稍有長大，存在尺寸不同的初次、二次和三次γ′相；過固溶熱處理合金的晶粒明顯長大，存在單模分布的二次γ′相；前者由于晶粒較小使強度更高，后者因減小二次γ′相尺寸和消除初次γ′相，PPB(原始顆粒邊界)和殘余枝晶，提高了合金的高溫塑性和持久性能，說明不同晶粒尺寸和γ′相特征是FGH98Ⅰ盤件獲得雙性能的關(guān)鍵因素

    Abstract:

    The microstructure and precipitates of a novel nickel-based powder metallurgy (P/M) superalloy FGH98 I in subsolvus and supersolvus heat treatment condition was studied by means of thermodynamic calculation, OM, FESEM and chemical phase analysis. The relationship between microstructure and mechanical properties was also analyzed. The results show that the precipitates of the alloy FGH98 I heat treated at 1130 oC and 1190 oC are γ′, MC, M23C6 and M3B2, without the observation of TCP phases. The grains of subsolvus heat treated FGH98 I grow slightly, and there are primary, secondary and tertiary γ′ phases with different sizes. The grains of supersolvus heat treated FGH98 I grow significantly, and the alloy has monomodal γ′ precipitate distribution. The former has higher strength because of finer grains, while the latter has improved high temperature ductility and stress rupture properties due to the reduced size of secondary γ′ phases and the elimination of primary γ′ phases, PPB (prior particle boundary) and residual dendrite structure. It reveals that the different grain sizes and γ′ characteristics are the key factors for dual-property FGH98 I disk

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吳 凱,劉國權(quán),胡本芙,張義文,陶 宇,劉建濤.固溶熱處理對新型鎳基粉末FGH98Ⅰ高溫合金組織與性能的影響[J].稀有金屬材料與工程,2011,40(11):1966~1970.[Wu Kai, Liu Guoquan, Hu Benfu, Zhang Yiwen, Tao Yu, Liu Jiantao. Effect of Solution Heat Treatment on the Microstructure and Properties of a Novel Nickel-Based P/M Superalloy FGH98 I[J]. Rare Metal Materials and Engineering,2011,40(11):1966~1970.]
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  • 收稿日期:2010-11-27
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