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The Influences of Y2O3 Addition to the Microstructure and Properties of a Ni-based Superalloy

Author: TianLiXi
Tutor: XiongWeiZuo
School: Huazhong University of Science and Technology
Course: Materials Science
Keywords: powder metallurgy Ni-based superalloy dispersion strengthen Y2O3 milling
CLC: TG132.32
Type: Master's thesis
Year: 2008
Downloads: 203
Quote: 0
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Abstract


In order to enhance the mechanic properties of a Ni-based superalloy already in use, we add Y2O3 particles to make oxide dispersion strengthen. Samples are made through milling, consolidation and vacuum sintering. Bars for Anti-tensile test are made through grinding and linear cutting. This paper primarily discusses the influences of milling parameters to the powder granularity and pressing property, compared and analyzes the impurity contamination situations, studies the influence of Y2O3 content to the microstructure and mechanic properties of the samples and gives relative explanations.When the milling speed reaches 320r/min,the powders are obviously refined and the powders is even finer when milling with balls in all sizes. Also, when milling speed reaches 320r/min, the consolidation property of the powders is improved and can be pressed without binder.When the summit sintering temperature differs from 1260oC to 1350 oC, relative densities of samples with a Y2O3 content increase as the increasing of the sintering temperature. With a same sintering temperature, relative densities decrease as the increasing of the Y2O3 content.Tensile strength of the samples rises at first and goes down latter with the increasing of the Y2O3 content. Maximum tensile strength get in the experiment is 669MPa when Y2O3 content is 1.5%.Moreover, Crystal size is refined by the addition of Y2O3 .

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Metallurgy and Heat Treatment > The alloy learn with a variety of properties of alloys > Special physical properties of alloys > Special thermal properties of alloys > Melting point alloys , refractory alloy , high temperature alloys
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