本文選題：GH4169　切入點(diǎn)：TLP　出處：《山東大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：針對目前GH4169鎳基高溫合金在航空航天領(lǐng)域的廣泛使用,同時(shí)結(jié)合瞬時(shí)液相擴(kuò)散焊(TLP)的發(fā)展現(xiàn)狀,本文對傳統(tǒng)GH4169瞬時(shí)液相擴(kuò)散焊工藝進(jìn)行優(yōu)化改良,使用45μm箔片狀BNi-2中間層材料,通過使用所設(shè)計(jì)的三種瞬時(shí)液相擴(kuò)散焊工藝:等溫等壓擴(kuò)散工藝、降溫升壓擴(kuò)散工藝、升溫降壓擴(kuò)散工藝,對使用這三種不同焊接工藝連接的接頭進(jìn)行接頭組織及力學(xué)性能的研究,并提供了工藝優(yōu)化的方向和依據(jù)。具體分析了三種TLP擴(kuò)散焊工藝焊接接頭等溫凝固區(qū)(ISZ)中存在的一類析出物的形貌特征、析出量和析出位置,擴(kuò)散區(qū)(DZ)中存在的一類三種形貌析出物的形貌特征和析出位置,并通過掃描電鏡(SEM)配合能譜儀(EDS)分析析出物的元素組成,比較了三種TLP擴(kuò)散焊工藝焊接接頭ISZ、DZ的寬度尺寸、接頭母材區(qū)晶粒度、硬度差異,通過室溫拉伸試驗(yàn)分析工藝-組織-力學(xué)性能三者的聯(lián)系性。通過使用SEM、EDS、XRD、OM確定接頭拉伸試驗(yàn)拉伸斷裂位置,指出接頭強(qiáng)度的薄弱位置。最后,通過優(yōu)化TLP擴(kuò)散焊連接工藝曲線,對等溫等壓擴(kuò)散工藝進(jìn)行不同焊接壓力的實(shí)驗(yàn),指出一定壓力范圍內(nèi)焊接壓力對等溫等壓擴(kuò)散工藝接頭組織性能的影響,對降溫升壓擴(kuò)散工藝進(jìn)行不同等溫凝固時(shí)間的實(shí)驗(yàn),指出等溫凝固時(shí)間增加對接頭組織性能不利的影響,同時(shí)分析降溫升壓擴(kuò)散工藝接頭ISZ的特殊形態(tài)的析出物,指出其產(chǎn)生原因,以及其對接頭性能的不良影響,確定了工藝優(yōu)化,參數(shù)選擇的原則。
[Abstract]:In view of the wide application of GH4169 nickel based superalloy in aerospace field and the development of transient liquid phase diffusion welding (TLPP), the conventional GH4169 transient liquid phase diffusion welding process is optimized and improved, and 45 渭 m foil sheet BNi-2 interlayer material is used. By using three kinds of instantaneous liquid phase diffusion welding technology: isothermal and isobaric diffusion process, temperature drop and pressure rise diffusion process, temperature and pressure reduction diffusion process, The microstructure and mechanical properties of the joints connected by these three different welding processes were studied. The direction and basis of process optimization are provided. The morphology, amount and location of a class of precipitates in the isothermal solidification zone of three TLP diffusion welding processes are analyzed in detail. The morphologies and locations of three kinds of precipitates in diffusion zone (DZ) were analyzed by scanning electron microscopy (SEM) and energy spectrometer (EDS). The width and size of the welded joints in three TLP diffusion welding processes were compared. The difference of grain size and hardness in the base metal area of the joint is analyzed by the tensile test at room temperature. The connection between the workmanship, the microstructure and the mechanical properties is analyzed. The tensile fracture position of the joint is determined by means of SEMMA-EDSX XRDX OM, and the weak position of the joint strength is pointed out. By optimizing the joining process curve of TLP diffusion welding, the different welding pressure of isothermal isobaric diffusion process is tested, and the effect of welding pressure on the microstructure and properties of isothermal isobaric diffusion process joint is pointed out in a certain pressure range. Experiments on different isothermal solidification time were carried out in the process of cooling and boosting diffusion. It was pointed out that the increase of isothermal solidification time had an adverse effect on the microstructure and properties of the joint. At the same time, the precipitates of the special form of ISZ of the joint were analyzed. The causes and adverse effects on the properties of joints are pointed out, and the principles of process optimization and parameter selection are determined.
【學(xué)位授予單位】：山東大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TG453.9

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