Spray forming

Grant, Patrick S.

doi:10.1016/0079-6425(95)00004-6

Cited by 339 publications

(178 citation statements)

References 118 publications

Supporting

Mentioning

149

Contrasting

Unclassified

Order By: Relevance

“…Em um trabalho inédito realizado em nosso grupo, 3,7%B em peso foi adicionado a um aço inoxidável superduplex de uma classe ligeiramente inferior ao 2507 (menor PREn), e houve a formação de boretos de ferro e cromo que aumentaram significativamente a resistência ao desgaste do material sem deteriorar expressivamente a resistência a corrosão [1]. Essa adição foi processada pela conformação por spray que proporciona microestruturas homogêneas, com grãos equiaxiais relativamente pequenos e a presença de precipitados finos [4]. Nos trabalhos realizados por Zepon [2] e Nascimento [3], estudando a adição de boro a aços inoxidáveis supermartensíticos, os boretos também proporcionaram aumentos significativos na resistência ao desgaste.…”

Section: Introductionunclassified

Estudo Da Solidificação De Aços Inoxidáveis Superduplex 2507 Modificados Com Boro Conformados Por Spray

Lopes¹,

Kiminami²,

Filho³

et al. 2018

ABM Proceedings

View full text Add to dashboard Cite

ResumoO presente trabalho teve como objetivo estudar a formação de fases em um aço inoxidável superduplex 2507, com adição de diferentes teores de boro, por meio do software termodinâmico Thermo-Calc, versão 4.0, avaliando a formação de boretos, considerando condições de equílibrio e segundo o modelo de Scheil na solidificação. Os resultados foram comparados com experimentos realizados utilizando-se um aço inoxidável superduplex de uma classe ligeiramente inferior (menor PREn) ao utilizado neste trabalho, com 3,7% em massa de boro. Verificou-se a formação de boretos primários do tipo (Fe,Cr)2B tanto nos cálculos termodinâmicos quanto na microestrutura do aço fundido. Conforme se aumenta o teor de boro, de um modo geral, a temperatura Liquidus aumenta, assim como também a fração da fase (Fe,Cr)2B. Por conta da presença de um teor mais elevado de nitrogênio no AISD 2507, foram formadas duas novas fases, identificadas como BN e Cr2N. Portanto, verificou-se que o software termodinâmico proporcionou uma boa previsibilidade, pois os resultados apresentaram-se em boa conformidade com experimentos. Palavras-chave:Thermo-Calc; Aço inoxidável; Conformação por spray; Solidificação STUDY OF SOLIDIFICATION SUPERDUPLEX STAINLESS STEEL MODIFIED WITH BORON SPRAY-FORMED AbstractThis work aimed to study the formation of phases in a superduplex stainless steel 2507, with the addition of different contents of boron through the thermodynamic software Thermo-Calc, version 4.0, evaluating the formation of borides, taking into consideration the balance condition and according to the Scheil model in solidification. The results were compared with experiments carried out using superduplex stainless steel of one slightly inferior category (lower PREn) than the one used in this work, with 3,7% of boron mass. It was verified the formation of primary borides type (Fe,Cr)2B both thermodynamic calculations as in the cast steel microstructure. As the boron content is increased, in general, the Liquidus temperature rises as well as the fraction of phase (Fe,Cr)2B. Due to the presence of a higher content of nitrogen in the AISD 2507, it was formed two new phases identified as BN and Cr2N. Therefore, it was verified that the thermodynamic software provided a good predictability, as the results showed in good coformity with the experiments.

show abstract

Section: Introductionunclassified

Estudo Da Solidificação De Aços Inoxidáveis Superduplex 2507 Modificados Com Boro Conformados Por Spray

Lopes¹,

Kiminami²,

Filho³

et al. 2018

ABM Proceedings

View full text Add to dashboard Cite

show abstract

“…The spray forming process combines two distinct but integral processes of melt disintegration, with a high velocity inert gas jet, into a spray of micron size droplets and its subsequent deposition onto a substrate. The melt disintegration with high velocity gas jet gives rise to rapid solidification effect in the droplets [12], whereas, subsequent deposition leads indirectly to the annealing effect due to slow cooling from high temperature. Therefore, the aim of the present work is to establish the spray forming route for the production of bulk, dense and chemically homogeneous single-phase icosahedral quasicrystalline Al 62 Cu 25.5 Fe 12.5 alloy.…”

Section: Introductionmentioning

confidence: 99%

“…) and the droplets experience high undercooling [12,14]. The solidification sequence of the alloy, therefore, would change according to the degree of undercooling [15].…”

mentioning

confidence: 99%

Synthesis of single phase i-AlCuFe bulk quasicrystal by spray forming

Srivastava¹,

Uhlenwinkel

Schulz

et al. 2008

Zeitschrift Für Kristallographie

View full text Add to dashboard Cite

Abstract. In the present study, an icosahedral single phase bulk quasicrystalline material based on Al 62 Cu 25.5 Fe 12.5 has been synthesised by a spray forming route. Microstructural characterization showed an average grain size of 10 mm. The oversprayed fine powder showed the presence of b-and lphases, whereas, the deposit consited of the fully single phase bulk quasicrystalline material with compositional homogeneity. The hardness and fracture toughness measurements were carried out at different indentation loads of 50-500 g. The hardness values varied in the range 10.4-8.1 GPa and fracture toughness was seen to decrease with increasing load. The varionan of hardness with load, which is known as indentation size effect (ISE), has been established clearly. Fracture toughness value was constant in the load range from 200 to 500 g at 1.2 MPa m 1/2 . The cracking pattern after indentation at higher load has been observed to be intergranular as well as transgranular. The evolution of the single phase bulk quasicrystalline material has been discussed in light of the unique combination of atomization and deposition process elements in spray forming technique.

show abstract

“…In recent decades, spray forming has become an important technology in the field of metallurgical materials [1][2][3] . Combination of atomization and deposition makes it possible for preparing high-performance materials and near-net shape billets with minimal steps.…”

Section: Introductionmentioning

confidence: 99%