本文關(guān)鍵詞： 激光再制造 鎳基高溫合金 工藝優(yōu)化 組織 高溫性能　出處：《南京航空航天大學》2016年碩士論文　論文類型：學位論文

【摘要】：在國家提倡資源可持續(xù)發(fā)展的要求下,再制造工程應(yīng)運而生,該工程本著優(yōu)質(zhì)、高效、環(huán)保、節(jié)能、節(jié)材的準則,節(jié)約了大量的成本,提高了資源的利用率。激光再制造技術(shù)是基于再制造工程與激光快速成形技術(shù)發(fā)展起來的一種先進再制造技術(shù),該技術(shù)在航空航天、大型機械設(shè)備、化工石油等領(lǐng)域的再制造工作中已得到廣泛應(yīng)用。本文將激光再制造技術(shù)運用到航空材料的再制造中。主要從機理分析、再制造工藝選擇、再制造件的性能測試等方面對航空發(fā)動機高壓壓氣機葉片常用材料GH4169鎳基高溫合金的再制造工作進行了研究分析,具體研究內(nèi)容如下:(1)研究了激光再制造技術(shù)的相關(guān)機理,包括材料與激光的相互作用機理、熔池內(nèi)部對流形成分析、熔池內(nèi)形核及晶核長大過程分析。(2)基于曲面響應(yīng)法研究了激光功率、掃描速度對單道熔覆層形貌特征的影響,基于稀釋率與接觸角這兩個指標對工藝參數(shù)帶進行了優(yōu)化,并最終得到7組優(yōu)化參數(shù)。(3)采用優(yōu)化后的7組工藝參數(shù)進行了再制造試驗,通過選擇合適的掃描路徑、搭接率對失效件進行再制造。研究激光功率、掃描速度對修復(fù)區(qū)微觀組織的影響,并對修復(fù)區(qū)內(nèi)析出相進行分析研究。(4)對再制造件的高溫力學性能進行了研究分析,根據(jù)零件在工作中的受力情況,重點對再制造件的高溫拉伸性能進行了研究。從抗拉強度、屈服強度、斷后延伸率、斷面形貌等方面分析了7組再制造件,其中1號再制造件修復(fù)效果最好,屈服強度已超過無損件的4.3%,從零件正常使用角度來看,再制造件的高溫拉伸性能已經(jīng)超過了無損件,達到了再制造的目的。
[Abstract]:Under the request of the country to promote the sustainable development of resources, the remanufacturing project has emerged as the times require. The project is based on the principles of high quality, high efficiency, environmental protection, energy saving and material saving, and saves a lot of costs. Laser remanufacturing technology is an advanced remanufacturing technology based on remanufacturing engineering and laser rapid prototyping technology, which is used in aerospace, large mechanical equipment, The laser remanufacturing technology has been widely used in the fields of chemical and petroleum industry. In this paper, the laser remanufacturing technology is applied to the remanufacturing of aeronautical materials. The remanufacturing work of GH4169 nickel-base superalloy, a common material for aeroengine high-pressure compressor blade, is studied and analyzed in aspects of performance test of remanufacturing parts. The specific research contents are as follows: (1) the related mechanism of laser remanufacturing technology is studied. Including the interaction mechanism between material and laser, the analysis of convection formation in the molten pool, the analysis of nucleation and nucleation growth process in the molten pool. (2) based on the surface response method, the effects of laser power and scanning speed on the morphology of the single pass cladding layer are studied. The process parameters were optimized based on dilution rate and contact angle, and 7 groups of optimized parameters were obtained. The influence of laser power and scanning speed on the microstructure of the repair zone was studied. The precipitation phase in the repair zone was analyzed and the mechanical properties of the remanufactured parts at high temperature were studied. According to the stress of the parts at work, the high temperature tensile properties of the remanufactured parts are studied. Seven groups of remanufactured parts are analyzed from the aspects of tensile strength, yield strength, elongation at break, section morphology, etc. The No. 1 remanufactured part has the best repair effect and the yield strength is higher than that of the non-destructive part. From the point of view of the normal use of the parts, the high temperature tensile properties of the remanufactured parts are better than the non-destructive parts, and the purpose of remanufacture is achieved.
【學位授予單位】：南京航空航天大學
【學位級別】：碩士
【學位授予年份】：2016
【分類號】：TG665;V252

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