新聞資訊
拓撲密排μ相對含微量元素Hf的鎳基粉末高溫合金
發布人：上海艾荔艾合金股份有限公司www.shailiai.cn
更新時間：2016-01-12
研究了含Hf(0~0.89%)的 FGH4097 粉末高溫合金中拓撲密堆μ相的析出動力學、組織形態以及 μ相對Hf含量為 0.30%的合金盤坯力學性能的影響.
拓撲密排μ相對含微量元素Hf的鎳基粉末高溫合金EFFECTS OF TOPOLOGICALLY CLOSE PACKED?μ?PHASE ON?MICROSTRUCTURE AND PROPERTIES IN POWDER METALLURGY?Ni-BASED SUPERALLOY WITH Hf?
研究了含 Hf (0~0.89%)的 FGH4097 粉末高溫合金中拓撲密堆 μ相的析出動力學、組織形態以及 μ相對 Hf 含量為 0.30%的合金盤坯力學性能的影響. 結果表明, Hf 含量為 0.30%和 0.89%的合金, 經750~900 ℃長期時效后 μ相已明顯析出. 隨著時效溫度的升高、時效時間的延長以及 Hf 添加量的增加, μ相析出量增加和尺寸長大. μ相主要在晶內以長條片狀形態析出. Hf 含量為 0.30%的 FGH4097 合金盤坯在550~650 ℃長期時效后沒出現 μ相, 高溫拉伸性能和高溫持久性能沒有降低, 組織穩定性良好. 750 ℃長期時效后, 盤坯中析出了 μ相, 析出的 μ相對高溫拉伸強度無明顯影響, 有助于提高高溫拉伸塑性, 降低了高溫持久壽命, 高溫持久塑性提高約 30%. 詳細討論了 μ相的析出行為、γ 固溶體中合金元素的再分配以及合金斷裂斷口的特征. 解釋了 μ相對力學性能影響的脆-韌雙重作用機理, 并提出控制和避免 μ相大量析出造成性能劣化的措施和方法.?
It is widely acknowledged that topologically close packed phases (TCP) are detrimental to?comprehensive properties of superalloys, as TCP phases deplete strengthening elements from matrix and easily?become crack initiations. In this work, the precipitation kinetics and morphology of topologically close packed μ?phase in FGH4097 powder metallurgy superalloy with 0~0.89% Hf and the effect of μ phase on the mechanical?properties of FGH4097 powder metallurgy (PM) superalloy billet with 0.30%Hf has been investigated. The results?showed that μ phase precipitated obviously in the alloys with 0.30% and 0.89%Hf after long-term aging at?750~900 ℃, the amount and size of μ phase increased as the aging temperature, aging time and Hf content?increasing. μ phase mainly precipitated in grains with strip and flake shapes. After long-term aging at 550~650 ℃,?no μ phase precipitated in FGH4097 PM superalloy billet with 0.30%Hf and the tensile properties and?stress-rupture properties at high temperature were not decreased, which showed excellent microstructure stability.?After long term aging at 750 ℃, precipitated μ phase had little effect on tensile strength at high temperature,?however, the tensile ductility increased and high temperature stress rupture life reduced, and the stress rupture?ductility increased by about 20%. In this work, the precipitation behavior of μ phase, the redistribution of?elements in γ solid solution and the FGH4097 PM superalloy fracture morphology characteristics have been?discussed in detail. The mechanism of the brittle and ductile dual effect of μ phase on the mechanical properties?has been explained. The methods of controlling and avoiding excessive μ phase precipitation which leaded to?
performance deterioration have been proposed.?
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