本文選題：GH4169 + 熱處理組織��； 參考：《南昌航空大學(xué)》2017年碩士論文

【摘要】：GH4169高溫合金廣泛應(yīng)用于航空航天等領(lǐng)域,其微觀組織決定了使用性能,通過對組織的分析,可以評判其使用性能是否符合工程實際使用的需求,常規(guī)的微觀組織檢測使用金相或電子顯微鏡分析,需要對零件進(jìn)行破壞性試驗且不能實現(xiàn)在役檢測。本論文研究GH4169合金材料合金組織與渦流、磁導(dǎo)率、電導(dǎo)率間的關(guān)系,力圖建立材料的渦流信號、電導(dǎo)率、磁導(dǎo)率特征和組織的關(guān)系,實現(xiàn)材料材料的組織無損檢測和評價。本文通過改變GH4169合金固溶溫度、冷卻方式形成不同的微觀組織,用差熱分析確定其相變點和強化相的溶解溫度,用金相法、電鏡觀察其組織變化,用ImageJ開放平臺自編金相分析軟件提取金相組織的特征參數(shù)(平均晶粒直徑、晶粒長軸、晶粒短軸等),并測量不同組織狀態(tài)下的材料硬度,隨后對不同金相組織、殘余應(yīng)力的試樣進(jìn)行渦流電導(dǎo)率測量、在固定磁場強度條件的的表面磁感應(yīng)強度測量、和渦流提離點差幅值測量。金相分析結(jié)果表明,在GH4169合金相變溫度以下固溶處理,因為δ相的存在,在晶間起到釘扎作用,所以晶粒平均直徑(26~28μm)、長軸(30~36μm)和短軸尺寸(20~22μm)增長并不明顯,在相變點以上固溶處理時,晶粒直徑增長速度明顯增大(50~123μm)。渦流電導(dǎo)率測量表明相變點以下的電導(dǎo)率高于相變點以上電導(dǎo)率,電導(dǎo)率隨固溶溫度升高而下降,垂直于表面磁感應(yīng)強度隨固溶溫度升高而升高,渦流提離點差幅值隨固溶溫度升高減小,這些變化均對應(yīng)固溶過程中強化相的溶解,固溶原子融入基體,晶格畸變增加,導(dǎo)致電導(dǎo)率下降、渦流提離點差幅值減小、強化相對磁疇的釘扎作用降低,相對磁導(dǎo)率上升。隨著合金熱處理狀態(tài)的改變,金相組織隨之發(fā)生變化,材料電磁特性亦發(fā)生改變。本論文的研究結(jié)果可以用于無損檢測GH4169的組織變化,用于航空發(fā)動機中高溫長期使用的GH4169組織演變關(guān)系研究,保證航空發(fā)動機的使用安全。
[Abstract]:GH4169 superalloy is widely used in aerospace and other fields. Its microstructure determines its performance. By analyzing the microstructure, it can be judged whether the performance of GH4169 meets the requirements of engineering practice. Metallography or electron microscope is used in the conventional microstructure testing. It is necessary to carry out destructive tests on the parts and it is not possible to carry out in-service inspection. In this paper, the relationship between the microstructure of GH4169 alloy and eddy current, permeability and conductivity is studied. The relationship between eddy current signal, conductivity, permeability and microstructure is established to realize the nondestructive testing and evaluation of the microstructure of GH4169 alloy. In this paper, by changing the solution temperature of GH4169 alloy, different microstructures are formed in the cooling mode. The phase transition point and the solution temperature of the strengthened phase are determined by differential thermal analysis. The microstructure changes are observed by metallographic method and electron microscope. The characteristic parameters of metallographic structure (average grain diameter, grain long axis, grain short axis, etc.) were extracted by ImageJ open platform, and the hardness of the materials was measured under different microstructure states. The residual stress samples were measured by eddy current conductivity measurement, surface magnetic induction intensity measurement under fixed magnetic field intensity condition, and eddy current lift point difference amplitude measurement. The results of metallographic analysis show that under the transformation temperature of GH4169, the average diameter of grain is 2628 渭 m / m, the long axis is 30 ~ 36 渭 m) and the short axis size is 2022 渭 m) due to the existence of 未 phase. The growth rate of grain diameter increases obviously when the solution treatment is above the transformation point. The eddy current conductivity measurement shows that the conductivity below the transition point is higher than that above the phase transition point, and the conductivity decreases with the increase of the solution temperature, and the magnetic induction intensity increases with the increase of the solution temperature. The amplitude of eddy current lift point difference decreases with the increase of solution temperature. These changes correspond to the dissolution of strengthening phase, the incorporation of solid solution atoms into the matrix, the increase of lattice distortion, the decrease of conductivity and the decrease of eddy current lift point difference amplitude. The pinning effect of the strengthened relative domain decreases and the relative permeability increases. With the change of the heat treatment state of the alloy, the microstructure of the alloy changes and the electromagnetic properties of the alloy change. The results of this paper can be used for nondestructive detection of the microstructure of GH4169, and for the study of the relationship between the microstructure evolution of GH4169, which has been used for a long period of time in aero-engines, to ensure the safety of the use of aeroengines.
【學(xué)位授予單位】：南昌航空大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TG156;TG132.3

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