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拓扑密排μ相对含微量元素Hf的镍基粉末高温合金
发布人：上海艾荔艾合金股份有限公司www.shailiai.cn
更新时间：2016-01-12
研究了含Hf(0~0.89%)的 FGH4097 粉末高温合金中拓扑密堆µ相的析出动力学、组织形态以及 µ相对Hf含量为 0.30%的合金盘坯力学性能的影响.
拓扑密排μ相对含微量元素Hf的镍基粉末高温合金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 粉末高温合金中拓扑密堆 µ相的析出动力学、组织形态以及 µ相对 Hf 含量为 0.30%的合金盘坯力学性能的影响. 结果表明, Hf 含量为 0.30%和 0.89%的合金, 经750~900 ℃长期时效后 µ相已明显析出. 随着时效温度的升高、时效时间的延长以及 Hf 添加量的增加, µ相析出量增加和尺寸长大. µ相主要在晶内以长条片状形态析出. Hf 含量为 0.30%的 FGH4097 合金盘坯在550~650 ℃长期时效后没出现 µ相, 高温拉伸性能和高温持久性能没有降低, 组织稳定性良好. 750 ℃长期时效后, 盘坯中析出了 µ相, 析出的 µ相对高温拉伸强度无明显影响, 有助于提高高温拉伸塑性, 降低了高温持久寿命, 高温持久塑性提高约 30%. 详细讨论了 µ相的析出行为、γ 固溶体中合金元素的再分配以及合金断裂断口的特征. 解释了 µ相对力学性能影响的脆-韧双重作用机理, 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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