1,720,954 research outputs found
Dislocation driven evolution of passivity in L-PBF 316 L: Unveiling the impact of thermal exposure
No full textThis study investigates the influence of subcritical thermal exposure on the passivation behaviour of laser powder bed fusion (L-PBF) processed 316 L stainless steel, with a focus on dislocation-driven mechanisms under industrially relevant conditions. A novel approach was taken by systematically examining the evolution of corrosion resistance as a function of both residual stress and dislocation density across a temperature range of 100–400 °C. The methodology integrated electrochemical characterisation with microstructural and crystallographic analysis. Results revealed a progressive decline in passive film stability up to 300 °C, corresponding with reduced dislocation density and stress relaxation. However, at 400 °C, passive film performance improved significantly despite further residual stress reduction. This behaviour was linked to the start of microstructural recovery, dissolution of subgrain boundaries, and a redistribution of geometrically necessary dislocations
Effect of heat treatment on corrosion performance of additive manufactured 316L produced by various techniques
No full textembargoed_20280326Questo studio analizza l’effetto del trattamento termico sulla microstruttura, sulle proprietà meccaniche e sulla resistenza alla corrosione dell’acciaio inossidabile 316L prodotto tramite due diverse tecniche di manifattura additiva: la fusione laser con polvere (LPBF) e il Binder Jetting
(BJ). La ricerca dimostra che il trattamento termico svolge un ruolo chiave nel raffinamento della microstruttura e nel miglioramento delle prestazioni di entrambi i processi, sebbene la loro risposta al trattamento sia differente. I campioni LPBF nello stato as-built presentano una
microstruttura fine con grani colonnari, mentre i campioni BJ risultano più porosi e con una microstruttura più grossolana a causa del processo di sinterizzazione. Il trattamento termico porta a un ingrossamento dei grani e alla trasformazione della δ-ferrite in struttura austenitica,
soprattutto a temperature più elevate. I test meccanici evidenziano una riduzione della durezza con l’aumento della temperatura, particolarmente nei campioni LPBF, mentre i campioni BJ mostrano un miglioramento della densificazione e della stabilità meccanica dopo la sinterizzazione e il trattamento termico. Anche la resistenza alla corrosione migliora significativamente in entrambi i casi, poiché il trattamento termico stabilizza lo strato passivo, riducendo la densità dei difetti e migliorando le prestazioni elettrochimiche. Le analisi confermano che temperature di trattamento più elevate favoriscono un comportamento di passivazione migliore e una maggiore resistenza alla corrosione localizzata, soprattutto nei campioni LPBF. Studi futuri dovrebbero esplorare strategie di post-processing alternative, come parametri di sinterizzazione ottimizzati per i campioni BJ e trattamenti termici per i campioni LPBF, per migliorare ulteriormente le proprietà finali. Questa ricerca conferma che il trattamento termico è un passaggio essenziale per ottimizzare le proprietà dell’acciaio 316L prodotto tramite manifattura additiva, rendendolo più adatto per applicazioni industriali e biomedicali.This study investigates the effect of heat treatment on the microstructure, mechanical properties, and corrosion resistance of 316L stainless steel fabricated using two different additive manufacturing techniques: Laser Powder Bed Fusion (LPBF) and Binder Jetting (BJ). The research demonstrates that heat treatment plays a crucial role in refining the microstructure and improving the performance of both manufacturing methods, although their responses to thermal processing differ. As-built LPBF samples exhibit a fine columnar grain structure, while BJ samples have a more porous and coarser microstructure due to the sintering process. Heat treatment leads to grain coarsening and the transformation of δ-ferrite into an austenitic structure, particularly at higher temperatures. Mechanical tests show a decrease in hardness with increasing temperature, especially in LPBF samples, while BJ specimens demonstrate improved densification and mechanical stability after sintering and thermal treatment. Corrosion resistance is significantly enhanced in both cases, as heat treatment stabilizes the passive layer, reducing defect density and improving electrochemical performance. Electrochemical analyses confirm that higher treatment temperatures contribute to better passivation behavior and higher resistance to localized corrosion, especially for LPBF samples. Future studies should explore alternative post-processing strategies, such as optimized sintering parameters for BJ samples an heat treatments for LPBF samples, to further enhance their properties. This research confirms that heat treatment is a fundamental step in optimizing the properties of 316L stainless steel produced by additive manufacturing, making it more suitable for industrial and biomedical applications
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe 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
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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