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| 1 | Effect of cooling rate during quenching on the microstructure and creep property of nickel-based superalloy FGH96显示文摘The effect of cooling rate during quenching on the microstructure and creep property of nickel-based superalloy FGH96 was investigated. Three groups of samples were quenched continuously with three fixed cooling rates, respectively, then subjected to a creep test under a constant load of 690 MPa at 700℃. Clear differences in size of secondary γ′ precipitates, creep properties and substructure of creep-tested samples were observed. The quantitative relationship among cooling rate, the size of secondary γ′ precipitates, and steady creep rate was constructed. It was found that with increasing cooling rate, the size of secondary γ′ precipitates decreases gradually, showing that the relationship between the size of secondary γ′ precipitates and the cooling rate obeys a power law, with an exponent of about –0.6, and the creep rate of steady state follows a good parabola relationship with cooling γ′ precipitate size. For 235℃/min, FGH96 alloy exhibited very small steady creep rate. The density of dislocation was low, and the isolated stacking fault was the dominant deformation mechanism. With decreasing cooling rates, the density of dislocation increased remarkably, and deformation microtwinning was the dominant deformation process. Detailed mechanisms for different cooling rate were discussed. | Ye-fei Feng Xiao-ming Zhou Jin-wen Zou Gao-feng Tian | 2019 | International Journal of Minerals,Metallurgy and Materials2019，26，4： | 11 |
| 2 | 镍基高温合金FGH96粉末脱气行为研究显示文摘通过程序升温脱附联合质谱仪(TPD-MS)、场发射扫描电子显微镜(FE-SEM)、X射线光电子能谱(XPS)等分析手段,研究了脱气温度对镍基高温合金FGH96粉末脱气行为的影响。结果表明:随着加热温度升高,在氦气吹扫的实验条件下,粉末表面发生了氢气(H2)、水(H_(2)O)、一氧化碳(CO)以及二氧化碳(CO_(2))的脱附,氢气和一氧化碳的脱附主要发生在保温阶段,水和二氧化碳的脱附主要出现在升温阶段。在脱气过程中,粉末表面存在的TiO_(2)、Cr_(2)O_(3)以及Nb2O5等氧化物基本不发生分解脱氧,而Ni(OH)2等氢氧化物发生水解脱氧,生成Ni单质。脱气温度对FGH96高温合金粉末脱气行为影响显著,对本研究所用的FGH96高温合金粉末氦气吹扫时间少于1 h时,建议脱气温度为350~450℃。 | 罗学军 张利冲 李周 陈昊 | 2021 | 粉末冶金工业2021，31，4： | 2 |
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