The structure of the heat-affected zone in welds of a Ni-29 wt.% Mo commercial alloy (Hastelloy B2)

Cao, Siqi; Brooks, C. R.; S, Whittaker G

doi:10.1016/1044-5803(94)90054-x

Cited by 7 publications

(2 citation statements)

References 6 publications

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“…Given that borides and carbides have higher concentrations of chromium and molybdenum than the BM, these phases are responsible for the deterioration of corrosion resistance and physical properties. The corrosion rate of the alloy increases with the decreasing concentration of Mo and Cr due to the increase in the cathode reaction rate (i.e.,

ion reduction) [ 22 , 23 ]. The emergence of artistic phases leads to the depletion of Cr in diffuse brazed areas; this phenomenon is undesirable and weakens the corrosion behaviour of the joints, leading to the same width of Cr-depleted zone and ASZ [ 24 ].…”

Section: Introductionmentioning

confidence: 99%

Effect of MBF-20 Interlayer on the Microstructure and Corrosion Behaviour of Inconel 625 Super Alloy after Diffusion Brazing

et al. 2023

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The joining zone includes three main parts, which comprise an isothermal solidification zone (ISZ), the athermal solidification zone (ASZ), and a diffusion affected zone (DAZ). Field emission scanning electron microscopy (FESEM) was used here to observe the microstructure equipped with ultra-thin window energy dispersive X-ray spectrometer (EDS) system. Additionally, electrochemical impedance spectroscopy (EIS) and cyclic potentiodynamic polarization tests were conducted to evaluate the effect of the DB process on the corrosion resistance of the Inconel 625 superalloy. In the bonding time period, some Mo- and Cr-rich boride precipitations and Ni-rich γ-solid solution phases with hardened alloy elements, such as Mo and Cr, formed in DAZ and ASZ, respectively, because of the inter-diffusion of melting point depressants (MPD). Moreover, during cooling cycles, Ni-Cr-B, Ni-Mo-B, Ni-Si-B, and Ni-Si phase compounds were formed in the ASZ area at 1110–850 °C. The DAZ area developed by borides compound with cubic, needle, and grain boundary morphologies. The corrosion tests indicated that the DB process led to a reduction in the passive region and increased the sensitivity to pitting corrosion.

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Section: Introductionmentioning

confidence: 99%

Effect of MBF-20 Interlayer on the Microstructure and Corrosion Behaviour of Inconel 625 Super Alloy after Diffusion Brazing

et al. 2023

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“…De esta necesidad nacieron las aleaciones de níquel Hastelloy B2 cuya composición química se caracteriza por su elevado contenido en molibdeno. Este elemento le confiere una excelente resistencia a la corrosión, elevada estabilidad térmica y baja dilatación hasta temperaturas próximas a 1100 °C, (Davis, 2000;Cao et al, 1994).…”

Section: Introductionunclassified

Influencia de los parámetros de soldeo fuerte en la microestructura y propiedades mecánicas de la unión de la aleación base níquel Hastelloy B2

Sotelo¹,

González²,

Porto³

2014

REVMETAL

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RESUMEN:Se realizó un estudio pormenorizado del proceso de soldeo fuerte en horno de alto vacío de la aleación base níquel Hastelloy B2 fortalecida por solución sólida. En una primera fase del trabajo se seleccionó el material de aporte acorde al material objeto de unión y a la fuente de calentamiento seleccionada. Posteriormente, se evaluó la influencia del gap (50 y 200 micrómetros) y tiempo de permanencia a temperatura de soldeo (10 y 90 minutos) sobre los microconstituyentes de la unión, relacionando la microestructura con las propiedades mecá-nicas de la junta. Los análisis metalográficos mostraron una unión constituida por una matriz rica en níquel, siliciuros de níquel y compuestos ternarios. Finalmente, los resultados de los ensayos mecánicos a esfuerzos cortantes mostraron una elevada resistencia para gaps de 50 micrómetros y tiempos de permanencia de 90 minutos.PALABRAS CLAVE: Hastelloy; Níquel; Soldadura fuerte; Vacío Citation / Cómo citar este artículo: Sotelo, J.C., González, M., Porto, E. (2014) "Influencia de los parámetros de soldeo fuerte en la microestructura y propiedades mecánicas de la unión de la aleación base níquel Hastelloy B2". Rev. Metal. 50(3): e019. doi: http://dx.doi.org/10.3989/revmetalm.019. ABSTRACT: Influence of the brazing parameters on microstructure and mechanical properties of brazed joints of Hastelloy B2 nickel base alloy.A study of the high vacuum brazing process of solid solution strengthened Hastelloy B2 nickel alloy has been done. A first stage of research has focused on the selection of the most appropriate brazing filler metal to the base material and vacuum furnace brazing process. The influence of welding parameters on joint microstructure constituents, relating the microstructure of the joint to its mechanical properties, has been evaluated. Two gaps of 50 and 200 micrometers, and two dwell times at brazing temperature of 10 and 90 minutes were studied. The braze joint mainly consists of the nickel rich matrix, nickel silicide and ternary compounds. Finally, the results of this study have shown the high bond strength for small gaps and increased dwell times of 90 minutes.

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Weldability of Nickel-Base Alloys

Caron¹,

Sowards

2014

Comprehensive Materials Processing

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The structure of the heat-affected zone in welds of a Ni-29 wt.% Mo commercial alloy (Hastelloy B2)

Cited by 7 publications

References 6 publications

Effect of MBF-20 Interlayer on the Microstructure and Corrosion Behaviour of Inconel 625 Super Alloy after Diffusion Brazing

Effect of MBF-20 Interlayer on the Microstructure and Corrosion Behaviour of Inconel 625 Super Alloy after Diffusion Brazing

Influencia de los parámetros de soldeo fuerte en la microestructura y propiedades mecánicas de la unión de la aleación base níquel Hastelloy B2

Weldability of Nickel-Base Alloys

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