1,725,669 research outputs found
VAMDC extraction with identifier = 14d9f7c5-aa3b-444a-8620-6a12e5c52fc2
No full text<div>This is a dataset extracted from https://cdms.astro.uni-koeln.de/jpl/tap/ VAMDC node.</div><div>Query originating this dataset: query=select species; </div><div> Data source version: 2019-11-27</div><div>Data format: XSAMS 12.07</div><div>Query uuid in VAMDC query store: 14d9f7c5-aa3b-444a-8620-6a12e5c52fc2</div>
Process Practice on Improvement of 300 mm x 360 mm Casting Bloom Macro-Segregation of 8620 Series Gear Steel
No full textThe superheating extent of liquid of 8620 gear steel (/% : 0. 18 〜0. 22C, 0. 17 ~ 0. 26Si, 0. 70 ~ 0.90Mn, ≤ 0.025P, 0.15 ~0.23S, 0.40 ~ 0.60Cr, 0.40 ~0.70Ni, 0.15 〜0.25Mo) for casting 300 mm x 360 mm bloom is 20 ~30 ℃ and the casting speed is 0. 5 ~0. 6 m/min, and by bloom drilling analysis, pin-shooting test, original position analysis and bloom macrostructure analysis the effect of electromagnetic stirring parameters [ M-EMS (100 - 200) A, (2.0 ~ 2.2) Hz, F-EMS ( 150 ~ 200) A, 8 Hz] and secondary cooling water parameters (Ⅰ- zone 28 L/min, Ⅱ - zone 38 ~45.6 L/min and Ⅲ- zone 19. 2 ~24 L/min) on C and S segregation in bloom has been studied. With using optimized process parameters- secondary cooling water Ⅰ- zone 28 L/min, Ⅱ - zone 45.6 L/min and Ⅲ- zone 19.2 L/min, and electromagnetic stirring M-EMS 150 A, 2. 2 Hz, F-EMS 200 A, 8 Hz, the ratio casting bloom of 8620 series gear steel with segregation index 0.98 ~ 1.05 increases to 92.8% from original 30%
SAE 8620 PSPP Map - Infographic
Get PDFThis infographic summarizes a Processing-Structure-Property-Performance (PSPP) Map for SAE 8620 alloy steel, with an emphasis on the gas carburization process. This PSPP map allows researchers and material scientists to better understand the processes that drive the microstructures, material properties, and ultimate performance parameters.https://scholarsjunction.msstate.edu/metallurgy/1023/thumbnail.jp
Comparison of Hardness and Wear Behaviour οf Boronized and Carburized AISI 8620 Steels
No full textIn this study, the hardness and wear behaviour of carburized and boronized AISI 8620 steels have been studied. The boronizing treatment increased the hardness of AISI 8620 steels from 395 to a maximal 1610 compared to the carburized steels and also significantly improved its wear behaviour. From obtained results, it can be concluded that boronizing is very effective surface hardening method for improving the wear properties of AISI 8620 steels
Characterization of Boride Coatings on AISI 8620 Steels without and with Hydrogen Permeation
No full textThe present work studied the characterization of boriding coatings without and with exposed hydrogen permeation on AISI 8620 through microstructure and mechanical behavior. A dehydrated paste pack process was carried out for the formation of boride coatings on AISI 8620 at 1173, 1223, and 1273 K for 6 h of exposure time for each temperature. After boronizing, hydrogen was introduced into the borided steels by in situ cathodic charging using an H2SO4 acid electrolyte. Specimens borided without and with hydrogen were characterized by scanning electron microscopy with energy dispersive spectroscopy and X-ray diffraction. The experimental techniques of the Vickers microhardness and three-point bending were used. As a result, the hydrogen diffusion on steel AISI 8620 borided shows a significant increase in microhardness. Furthermore, three-point bend tests showed an increased strength on 8620 steel borided. However, the ductility and strength value on 8620 steel borided surfaces presented a drastic reduction due to hydrogen permeation. The results revealed that the borided coatings provided strength and reduced the hydrogen embrittlement index on AISI 8620 borided
Linked collectors and determiners for: Herbarium specimens of Société des Sciences Naturelles et Mathématiques de Cherbourg (CHE).
No full textNatural history specimen data linked to collectors and determiners held within, "Herbarium specimens of Société des Sciences Naturelles et Mathématiques de Cherbourg (CHE)". Claims or attributions were made on Bionomia by volunteer Scribes, <a href="http://bionomia.net/dataset/646858f7-8620-4124-9405-279539aec76c">https://bionomia.net/dataset/646858f7-8620-4124-9405-279539aec76c</a> using specimen data from the dataset aggregated by the Global Biodiversity Information Facility, <a href="https://gbif.org/dataset/646858f7-8620-4124-9405-279539aec76c">https://gbif.org/dataset/646858f7-8620-4124-9405-279539aec76c</a>. Formatted as a Frictionless Data package
Linked collectors and determiners for: Herbarium specimens of Société des Sciences Naturelles et Mathématiques de Cherbourg (CHE).
No full textNatural history specimen data linked to collectors and determiners held within, "Herbarium specimens of Société des Sciences Naturelles et Mathématiques de Cherbourg (CHE)". Claims or attributions were made on Bionomia by volunteer Scribes, <a href="http://bionomia.net/dataset/646858f7-8620-4124-9405-279539aec76c">https://bionomia.net/dataset/646858f7-8620-4124-9405-279539aec76c</a> using specimen data from the dataset aggregated by the Global Biodiversity Information Facility, <a href="https://gbif.org/dataset/646858f7-8620-4124-9405-279539aec76c">https://gbif.org/dataset/646858f7-8620-4124-9405-279539aec76c</a>. Formatted as a Frictionless Data package
Characterization of Graphene Coatings on 8620 Alloy Additive Manufactured Steel
No full textSelective laser melting (SLM) is one of the additive manufacturing (AM) processes which create dense components with high control over the alloy compositions [1]. The 8620 alloy is a low carbon, nickel chromium molybdenum alloy steel which is typically used for machine parts. However, its high iron content (∼98%) makes it very susceptible to oxidation. This research focuses on developing graphene surface coatings for 8620 and other iron-rich steels. In this study, AM8620 samples made by SLM were used. Previously, we demonstrated the coating of steel surfaces by a liquid-exfoliated graphene flakes (EGFs) method [2]. In this report, we present a graphene coating formed by directly growing graphene on the AM steel surface using a chemical vapor deposition (CVD) method. The effects of the surface morphologies and microstructure of the AM8620 steel on graphene coatings in relation to the two coating methods were characterized
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
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