The effect of post-weld heat treatment temperature on the microstructure of Inconel 625 deposited metal

Xing, Xi-Xue; Di, Xinjie; Wang, Baosen

doi:10.1016/j.jallcom.2013.12.224

Cited by 139 publications

(49 citation statements)

References 22 publications

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“…However, the segregation of solute elements during solidification in the welding process increases the likelihood for the precipitation of secondary phases, including both c¢¢ and d, Laves phases, and several carbide phases. [15,16] Similar effects have also been observed in rapidly solidified IN625. [17] The as-fabricated microstructure of AM-produced IN625 is strongly influenced by the type of AM process used.…”

Section: Introductionsupporting

confidence: 57%

Formation of the Ni3Nb δ-Phase in Stress-Relieved Inconel 625 Produced via Laser Powder-Bed Fusion Additive Manufacturing

Lass

Stoudt

Williams

et al. 2017

Metall Mater Trans A

163

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The microstructural evolution of laser powder-bed additively manufactured Inconel 625 during a post-build stress-relief anneal of 1 hour at 1143 K (870°C) is investigated. It is found that this industry-recommended heat treatment promotes the formation of a significant fraction of the orthorhombic D0 a Ni 3 Nb d-phase. This phase is known to have a deleterious influence on fracture toughness, ductility, and other mechanical properties in conventional, wrought Inconel 625; and is generally considered detrimental to materials' performance in service. The d-phase platelets are found to precipitate within the inter-dendritic regions of the as-built solidification microstructure. These regions are enriched in solute elements, particularly Nb and Mo, due to the micro-segregation that occurs during solidification. The precipitation of d-phase at 1073 K (800°C) is found to require up to 4 hours. This indicates a potential alternative stress-relief processing window that mitigates d-phase formation in this alloy. Ultimately, a homogenization heat treatment is recommended for additively manufactured Inconel 625 because the increased susceptibility to d-phase precipitation increases the possibility for significant degradation of materials' properties in service.

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Section: Introductionsupporting

confidence: 57%

Formation of the Ni3Nb δ-Phase in Stress-Relieved Inconel 625 Produced via Laser Powder-Bed Fusion Additive Manufacturing

Lass

Stoudt

Williams

et al. 2017

Metall Mater Trans A

163

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show abstract

“…The results confirm that Nb and Mo (k < 1) segregate to the interdendritic spaces. By contrast, Ni and Cr (k > 1) segregate to the dendrite cores [1,6,9].…”

Section: Resultsmentioning

confidence: 97%

“…Apart from the intermetallic phases carbides MC, 6 , nitrides and carbonitrides may be present in multicomponent nickel alloys [5,6]. Carbides can be formed inside the grains or on grain boundaries in the form of large particles uniformly distributed throughout the alloy volume.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Phase Transformations in Inconel 625 Alloy during Annealing

2016

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The investigation focused on the characterization of the microstructure and chemical composition changes after annealing. The research was conducted on the Inconel 625 weld overlay deposited on a boiler steel. The annealing was performed for 10 h at temperatures from 600 to 1000• C. The microstructure and chemical composition were examined by scanning electron microscope and transmission electron microscope equipped with an energy dispersive X-ray spectrometer. Weld overlays were produced by an innovative method of cold metal transfer.

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“…Entretanto, como estes tubos operam constantemente em condições de carregamento dinâmico, eles estão sujeitos ao fenômeno de fadiga. Neste sentido, a variação brusca de dureza na ZTA do substrato, causada pelo processo de deposição a laser da liga inconel não é desejável, pois esta variação acentuada de propriedades em uma extensão tão curta favorece o O tratamento TT_1 mostra que a microdureza do revestimento não sofreu alteração, isto está de acordo com a literatura, pois apesar da fase δ (Ni 3 Nb) ser termodinamicamente estável a 900 °C sua formação necessita de tempo e 20 minutos não é suficiente para este processo difusional [16][17][18]. A parte do substrato que não foi afetada termicamente pelo ciclo térmico da deposição também não sofreu alteração da dureza após TT_1, pois o ciclo térmico TT_1 foi idêntico ao ciclo térmico no estado como recebido.…”

Section: Resultsunclassified

EFEITO DE DIFERENTES TRATAMENTOS TÉRMICOS SOBRE MICROESTRUTURA E MICRODUREZA DE UM SISTEMA AÇO C-Mn/REVESTIMENTO DE INCONEL 625

Trindade¹,

Faria²,

Souza³

et al. 2017

Tecnol. Metal. Mater. Min.

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ResumoA utilização de tubos de aço C-Mn na indústria de óleo e gás é muito comum desde o nascimento desta indústria. Mesmo com a grande evolução da metalurgia destes aços ao longo das últimas décadas, o desafio de desempenho em ambientes severos de corrosão devido às características reativas (H 2 S, CO 2 ) do petróleo e seus derivados, impõem uma nova era para a fabricação de tubos. A solução tecnológica mais direta seria a utilização de aços com alta liga (Ni, Cr) e/ou superligas de níquel. No entanto, os custos de produção tornariam inviáveis pelo alto custo destes materiais. Neste contexto, é crescente iniciativas de pesquisas para o desenvolvimento de overlay e/ou cladding, ou seja, revestimentos de aços C-Mn usando superligas de níquel e aços inoxidáveis. Neste trabalho, foi utilizada a deposição de uma camada da superliga de níquel Inconel 625 através do processo laser. Uma das desvantagens da deposição a laser ou qualquer outro processo de fusão é a formação de uma região de descontinuidade microestrutural no aço, chamada de ZTA (zona termicamente afetada pelo calor). Neste estudo, diferentes rotas de tratamentos térmicos foram investigadas com o objetivo de eliminar a ZTA e preservar as características originais do substrato e do revestimento. Palavras-chave: Revestimento inconel 625/aço C-Mn; Perfil de microdureza; Transformação de fase; Martensita revenida; ZTA; Tratamentos térmicos. EFFECT OF DIFFERENT HEAT TREATMENTS ON MICROSTRUCTURE AND MICROHARDNESS OF A C-Mn STEEL/INCONEL 625 COATING SYSTEM AbstractThe application of C-Mn steel pipe in the oil & gas industry is quite common since starting of this industry. Even with the great evolution of the metallurgy of this type of steel over the last decades, the challenge is to overcome the corrosion severity caused by sour (H 2 S, CO 2 ) species present in the petroleum and its derivates. The direct technological solution would be to replace the C-Mn steel by Ni-based superalloys and/or stainless steels. However, the high costs of these materials would make several projects impracticable. In this context, there are several initiatives in order to develop overlay and/or cladding, that means, coatings of C-Mn steels using superalloys and stainless steels. In this work, it was used an overlay deposition of Inconel 625 on the surface of a C-Mn steel using the laser process. A disadvantage of laser deposition, as it is for any deposition melting process, is the formation of a microstructural discontinuity in the steel substrate caused by the thermal cycle (HAZ = heat affected zone). In this study, different heat treatment routes were investigated aiming to eliminate the HAZ preserving the original characteristics of the substrate and of the coating.

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The effect of post-weld heat treatment temperature on the microstructure of Inconel 625 deposited metal

Cited by 139 publications

References 22 publications

Formation of the Ni3Nb δ-Phase in Stress-Relieved Inconel 625 Produced via Laser Powder-Bed Fusion Additive Manufacturing

Formation of the Ni3Nb δ-Phase in Stress-Relieved Inconel 625 Produced via Laser Powder-Bed Fusion Additive Manufacturing

Analysis of Phase Transformations in Inconel 625 Alloy during Annealing

EFEITO DE DIFERENTES TRATAMENTOS TÉRMICOS SOBRE MICROESTRUTURA E MICRODUREZA DE UM SISTEMA AÇO C-Mn/REVESTIMENTO DE INCONEL 625

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