Welding Metallurgy of
01 Jan 1987-
About: The article was published on 1987-01-01 and is currently open access. It has received 991 citations till now. The article focuses on the topics: Welding.
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TL;DR: In this paper, a fonte de laser de diodo, equipada com um cabecote coaxial continuo, was used for deposicao de revestimentos of Stellite 6 livres de descontinuidades and com geometria adequada sobre aco inoxidavel austenitico.
Abstract: Resumo: O presente trabalho teve como objetivo determinar parâmetros de processamento a laser para deposicao de revestimentos de Stellite 6 livres de descontinuidades e com geometria adequada sobre aco inoxidavel austenitico. Revestimentos foram depositados com uma fonte de laser de diodo, equipada com um cabecote coaxial continuo, utilizando diferentes potencias do feixe e velocidades de varredura. A geometria (largura, altura, ondulacao e diluicao) dos revestimentos foi medida por meio de analise da seccao transversal. Esses dados obtidos foram utilizados para a modelagem do processo (superficie de resposta) e para estimar parâmetros otimizados (funcao desejabilidade), que foram posteriormente verificados experimentalmente. A microestrutura dos revestimentos depositados com os parâmetros otimizados foi caracterizada por microscopia optica e eletronica de varredura. A selecao adequada dos parâmetros resultou em revestimentos com bom acabamento, livre de descontinuidades superficiais e baixa diluicao. Os resultados mostram que a potencia do laser teve efeito significativo sobre a diluicao, enquanto a velocidade influenciou na altura da camada depositada. A microestrutura resultante do revestimento e composta por dendritas ricas em cobalto e a regiao interdendritica com carbonetos de cromo. Os resultados de dureza estao de acordo com o previsto na literatura.
4 citations
Cites background from "Welding Metallurgy of"
...[31] Kou S. Welding metallurgy....
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...Segundo Kou [31], junto a linha de fusão, G é elevado e R é baixa, então G/R é elevado o que corresponde a uma estrutura planar....
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Dissertation•
28 Apr 2017
TL;DR: In this paper, the authors present a table of contents and a list of tables and lists of figures, including the following categories: Table 1 Table 2 Table 3 Table 4 Table 5 Table 6
Abstract: ii TABLE OF CONTENTS iii-vii LIST OF TABLES viii-x LIST OF FIGURES xi-xv CHAPTER
4 citations
Cites background or result from "Welding Metallurgy of"
...These results are consistent with those in the reference (Kou, 2002 [86]), however the reason for this is not very clear....
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...Weld metal chemistry is an important factor in determining the mechanical and metallurgical properties of the weld (Davis, 1977 [33]; Kou, 2002 [86]; Palm, 1972 [116]; Polar, 1991 [127]; Tuliani, 1972 [150])....
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...This can be explained from the fact that Si 4+ metallic cation from slag is reduced and increases the silicon content in the weld pool-slag interface during electrode positive polarity (Kou, 2002 [86])....
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...SiO2 dissociates into silicon and oxygen during slag-metal reactions and thereby raises the silicon content in the weld (Kou, 2002 [86])....
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...6 Weld metal chemistry Weld metal chemistry is an important factor in determining the mechanical and metallurgical properties of the weld (Davis, 1977 [33]; Kou, 2002 [86]; Palm, 1972 [116]; Polar, 1991 [127]; Tuliani, 1972 [150])....
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TL;DR: In this article, a Benard cell was constructed for the solidification of a transparent alloy under Rayleigh-Benard convection, and dendrite fragmentation was observed, and the flow field was mapped.
Abstract: The present paper reports on an in situ experiment to investigate the effects of fluid flow on dendrite fragmentation. A Benard cell was constructed for the solidification of a transparent alloy under Rayleigh–Benard convection. Dendrite fragmentation was observed, and the flow field was mapped. It was found that a Benard cell provides a useful apparatus for studying dendrite fragmentation under controlled conditions in transparent alloys. Preliminary results showed that structural fragmentation occurs under relatively quiescent flow conditions, suggesting that deformation processes play little role in this system.
4 citations
TL;DR: In this article , two samples with different weld parameters (sample A and B) have been considered in order to investigate the metallurgical variation at the interface, and the formation of different phases shows the W6C, interdendritic eutectic phases Cr7C3, Cr23C6 and primary dendritic phases γ-Co, ϵ-Co and CrCo that are chiefly responsible for the higher hardness of sample B which has lower heat input.
4 citations
4 citations
References
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TL;DR: In this article, the state of the art in selective laser sintering/melting (SLS/SLM) processing of aluminium powders is reviewed from different perspectives, including powder metallurgy (P/M), pulsed electric current (PECS), and laser welding of aluminium alloys.
1,172 citations
TL;DR: In this article, the authors show that the pre-existing dislocation network, which maintains its configuration during the entire plastic deformation, is an ideal modulator that is able to slow down but not entirely block the dislocation motion.
557 citations
TL;DR: In this article, the fundamental understanding of structure-properties relationship in automotive steels resistance spot welds is discussed. And a brief review of friction stir spot welding, as an alternative to RSW, is also included.
Abstract: Spot welding, particularly resistance spot welding (RSW), is a critical joining process in automotive industry. The development of advanced high strength steels for applications in automotive industry is accompanied with a challenge to better understand the physical and mechanical metallurgy of these materials during RSW. The present paper critically reviews the fundamental understanding of structure–properties relationship in automotive steels resistance spot welds. The focus is on the metallurgical characteristics, hardness–microstructure correlation, interfacial to pullout failure mode transition and mechanical performance of steel resistance spot welds under quasi-static, fatigue and impact loading conditions. A brief review of friction stir spot welding, as an alternative to RSW, is also included.
369 citations
TL;DR: In this article, a unified equation to compute the energy density is proposed to compare works performed with distinct equipment and experimental conditions, covering the major process parameters: power, travel speed, heat source dimension, hatch distance, deposited layer thickness and material grain size.
369 citations
TL;DR: This study attempted to predict solidification defects by DNN regression with a small dataset that contains 487 data points and found that a pre-trained and fine-tuned DNN shows better generalization performance over shallow neural network, support vector machine, and DNN trained by conventional methods.
314 citations