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On the origin of defects in var ingots

Web9 de nov. de 2024 · In the industrial process, the vacuum arc remelting (VAR) process is widely used to manufacture high-performance stainless steel, nickel-based alloy, and titanium-based alloy, which can improve the cleanliness, homogeneity, and refinement of solidification structure [ 1 ]. Web13 de abr. de 2024 · Fe-based amorphous alloys often exhibit severe brittleness induced by annealing treatment, which increases the difficulties in handling and application in the industry. In this work, the shear transformation zone and its correlation with fracture characteristics for FeSiB amorphous alloy ribbons in different structural states were …

High cerium content (Nd-Pr-Ce)2Fe14B melt-spun ribbons with …

Web8 de nov. de 2016 · Remelting processes such as electroslag remelting (ESR) or vacuum arc remelting (VAR) or their combination are extensively used to enhance the quality of primary melted materials with respect to their homogeneity, solidification structure, soundness, and cleanliness. Web15 de jan. de 2012 · @misc{etde_21547772, title = {Influence of defects and impurities on the deteriorated border region in multicrystalline silicon ingots} author = {Wu, Shanshan, Wang, Lei, Li, Xiaoqiang, Wang, Peng, Yang, Deren, You, Da, Du, Jiabin, Zhang, Tao, and Wan, Yuepeng} abstractNote = {The origin of the lower minority carrier lifetime in the … on this regard synonym https://sreusser.net

Segregation Defects in VAR Titanium Alloys: I. Common Defects

Web6 de nov. de 2007 · process may contribute to the initiation and formation of freckle defects in INCONEL 718 ingot. DOI: 10.1007/s11661-008-9638-7 The Minerals, Metals & Materials Society and ... On longitudinal sections of VAR ingots, tree rings appear as fragments of chains of equiaxed grains that decorate the solid/liquid interface and can be used to ... Web26 RUSSIAN JOURNAL OF NON-FERROUS METALS Vol. 49 No. 1 2008 KONDRASHOV et al. nates G–v, the boundaries of the appearance of defects and the varying morphology of crystallization are plot- Web15 de abr. de 2011 · Our study focuses on the prevention of “white spots” in the alloy IN 718. These defects, which are small volumes of a few millimeters of characteristic length, are depleted in niobium. They are known to result from the fall of metal fragments in the liquid pool during VAR processing. on this regard 意味

Origin of Defects - BrainKart

Category:Metals Free Full-Text Numerical Investigation of Segregation

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On the origin of defects in var ingots

Effect of different factors on the formation of “crown” defects in ...

Webism of formation of "crown" defects in ingots made by vacuum-arc~remelting (VAR) and have studied the factors peculiar to the remelting process, specifically, the height and strength of the projecting part of the slag crust; the … Web1 de jan. de 2009 · An attempt is made to explain the origin of the defects, observed by a group of investigators in Alloy 718 ingot, remelted at abnormally long arc gap. It is shown …

On the origin of defects in var ingots

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WebK. McNamara, ... S.A.M. Tofail, in Comprehensive Materials Finishing, 2024 3.21.3.1.1 VAR. VAR is a consumable electrode remelting process which is carried out in vacuum and generally used for the production of NiTi. It is not a commonly used method for melting and producing of metals as it is both expensive and time consuming, this method is for … Web9 de fev. de 2024 · The surfaces of cold-rolled titanium-containing ferrite stainless steel (TCFSS) strips produced from scrap are prone to severe peeling owing to cracking near slab inclusions during hot rolling. In this study, the Taguchi method was used to prevent peeling defects and clogging of the submerged entrance nozzle, and the optimal casting …

Web11 de abr. de 2024 · The effects of wheel speeds on the magnetic properties and microstructures of [(Nd,Pr) 1–x Ce x]-Fe-B melt-spun ribbons were investigated.Compared to melt-spun ribbons with low cerium (Ce) content (x = 0.2), amorphous formation can be suppressed at high wheel speed in the ribbons with a relatively high Ce content (x = 0.8), … WebLab Ingots Macrostructure. The macrostructure of the as-cast lab ingots showed a typical structure with equiaxed and columnar regions. After homogeniza- tion, the …

WebThe VAR process melts the electrode made in the VIM furnace into a water cooled copper crucible at a controlled melt rate. Although the VAR process reduces the levels of volatile …

Web1 de mai. de 2024 · 2.2. Evaluation of solidification quality. The solidification quality of an ingot mainly depends on the LST, which represents the time required from the start to the end of solidification [28].The shorter LST leads to the less chance of formation of various solidification defects, and thus the better solidification quality of the ingots.

WebThe remelting steps would first be electro-slag remelting (ESR) followed by vacuum arc remelting (VAR). The modelers hypothesized two scenarios to back-calculate the initial size of the defect: 1) If an iron piece falls into the melt during the VAR process (1 remelting step) and experiences partial melting. 2) If an iron piece falls into the ... on this roadWeb1 de jul. de 2011 · Our study focuses on the prevention of “white spots” in the alloy IN 718. These defects, which are small volumes of a few millimeters of characteristic length, are … iosi the regretful spyWeb5 de jul. de 2024 · The VAR process is used to improve the purity and refine the structure of specialty metal ingots through the removal of potential defects and crack initiation sites. VAR utilizes a consumable electrode that generates heat from a DC arc formed between the electrode and ingot. ioskamean medicationWeb18 de fev. de 2024 · The ingot melted at the current corresponding to the minimum local solidification time was free of segregation defects. It should be noted that even the simple model presented in this work needs the knowledge of a large number of numerical values of the properties of an alloy and boundary conditions. on this road to gloryland lyricsWebPEWTER/TIN INGOTS,5 lbs 96% TIN, SCRAP,JEWELRY,HOBBIES,CASTING,RELOADING,BULLION. Sponsored. $81.49. ... packaging, or in the original packaging but not sealed. The item may be a factory second or a new, unused item with defects. See the seller’s listing for full details and description of … on this road for glorylandWebThe origin of the lower minority carrier lifetime in the border region of multicrystalline silicon (mc-Si) ingots was investigated. Based on minority carrier lifetime measurements and … ios kcgpatheofillWeb27 de jun. de 2024 · In VAR titanium alloy ingots, the zonal segregation increases with the electric current, which facilitates mixing in the molten pool. To reduce the rotation of the … ios jpg to heic