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首页> 外文期刊>Journal of Materials Engineering and Performance >Microscopic Observations on the Origin of Defects During Machining of Direct Aged (DA) Inconel 718 Superalloy
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Microscopic Observations on the Origin of Defects During Machining of Direct Aged (DA) Inconel 718 Superalloy

机译：直接老化（Inconel 718高温合金）加工过程中缺陷来源的显微观察

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Surface quality of advanced superalloys after machining is one of the major issues in the aerospace industry because it directly affects service characteristics of the machined part. Tool life of cemented carbide inserts with the TiAlN coating during machining of direct aged DA 718 alloys under roughing and finishing conditions has been under study. The defect origin on the surface of the machined part was investigated. Metallographic observations of the DA 718 were made using optical metallography and SEM/EDS. To find out the origins of surface defect formation, the morphology of machined parts and cross sections of the machined surfaces have been investigated. Two major categories of defects were detected on the surface of the machined part: cracks and tears. The origin of the cracks on the machined surface is related to shearing of the primary complex TiC/NbC carbide revealed in a structure of DA 718 alloy. At the same time, Nb-rich regions of the primary complex carbide interact with the environment (oxygen from air) during machining with further formation of low strength oxide layer on the surface, forming tears.
机译：加工后的高级高温合金的表面质量是航空航天工业的主要问题之一，因为它直接影响加工零件的服务特性。研究了在粗加工和精加工条件下对直接时效DA 718合金进行机械加工时，带有TiAlN涂层的硬质合金刀片的刀具寿命。研究了加工零件表面上的缺陷来源。 DA 718的金相观察是使用光学金相和SEM / EDS进行的。为了找出形成表面缺陷的起源，已经研究了加工零件的形态和加工表面的横截面。在加工零件的表面检测到两大类缺陷：裂纹和撕裂。加工表面上裂纹的起源与DA 718合金结构中显示的初生TiC / NbC碳化物的剪切有关。同时，在加工过程中，初级复合碳化物的Nb富集区域与环境（空气中的氧气）相互作用，并在表面上进一步形成低强度氧化物层，形成裂缝。

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