The role of nano-sized intergranular phases on nickel alloy 725 brittle failure

Abstract Although precipitation-hardened nickel alloys, such as Alloy 725, are extensively used in the most aggressive oil and gas production conditions given their a priori superior environmentally assisted cracking resistance, recent failures associated with hydrogen embrittlement (HE) cast doubts...

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Autores principales:	Maria Sofia Hazarabedian, Mariano Iannuzzi
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Materials of engineering and construction. Mechanics of materials TA401-492
Acceso en línea:	https://doaj.org/article/9fbd0eb61d9248d3a5dfdb3f3f9c9793
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spelling	oai:doaj.org-article:9fbd0eb61d9248d3a5dfdb3f3f9c97932021-12-02T16:17:16ZThe role of nano-sized intergranular phases on nickel alloy 725 brittle failure10.1038/s41529-021-00185-22397-2106https://doaj.org/article/9fbd0eb61d9248d3a5dfdb3f3f9c97932021-07-01T00:00:00Zhttps://doi.org/10.1038/s41529-021-00185-2https://doaj.org/toc/2397-2106Abstract Although precipitation-hardened nickel alloys, such as Alloy 725, are extensively used in the most aggressive oil and gas production conditions given their a priori superior environmentally assisted cracking resistance, recent failures associated with hydrogen embrittlement (HE) cast doubts about their performance in H-bearing environments. These high-profile incidents have led to extensive research to elucidate the failure mechanism and develop methods to reduce risks. However, the microstructural features that made only specific heats of Alloy 725 susceptible to HE have yet to be agreed upon by the scientific community. Herein, our results showed that the abundant precipitation of F phase, i.e., a recently discovered nano-sized and embrittling phase, at grain boundaries increased cracking susceptibility. A continuous F phase network offered a low-energy path for crack opening by matrix-precipitate interfacial decohesion. Additionally, we correlated Alloy 725 microstructure with HE resistance, which is essential for thermomechanical processing optimization and the design of alternative qualification tests to obtain embrittlement-resistant nickel alloys.Maria Sofia HazarabedianMariano IannuzziNature PortfolioarticleMaterials of engineering and construction. Mechanics of materialsTA401-492ENnpj Materials Degradation, Vol 5, Iss 1, Pp 1-9 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Materials of engineering and construction. Mechanics of materials TA401-492
spellingShingle	Materials of engineering and construction. Mechanics of materials TA401-492 Maria Sofia Hazarabedian Mariano Iannuzzi The role of nano-sized intergranular phases on nickel alloy 725 brittle failure
description	Abstract Although precipitation-hardened nickel alloys, such as Alloy 725, are extensively used in the most aggressive oil and gas production conditions given their a priori superior environmentally assisted cracking resistance, recent failures associated with hydrogen embrittlement (HE) cast doubts about their performance in H-bearing environments. These high-profile incidents have led to extensive research to elucidate the failure mechanism and develop methods to reduce risks. However, the microstructural features that made only specific heats of Alloy 725 susceptible to HE have yet to be agreed upon by the scientific community. Herein, our results showed that the abundant precipitation of F phase, i.e., a recently discovered nano-sized and embrittling phase, at grain boundaries increased cracking susceptibility. A continuous F phase network offered a low-energy path for crack opening by matrix-precipitate interfacial decohesion. Additionally, we correlated Alloy 725 microstructure with HE resistance, which is essential for thermomechanical processing optimization and the design of alternative qualification tests to obtain embrittlement-resistant nickel alloys.
format	article
author	Maria Sofia Hazarabedian Mariano Iannuzzi
author_facet	Maria Sofia Hazarabedian Mariano Iannuzzi
author_sort	Maria Sofia Hazarabedian
title	The role of nano-sized intergranular phases on nickel alloy 725 brittle failure
title_short	The role of nano-sized intergranular phases on nickel alloy 725 brittle failure
title_full	The role of nano-sized intergranular phases on nickel alloy 725 brittle failure
title_fullStr	The role of nano-sized intergranular phases on nickel alloy 725 brittle failure
title_full_unstemmed	The role of nano-sized intergranular phases on nickel alloy 725 brittle failure
title_sort	role of nano-sized intergranular phases on nickel alloy 725 brittle failure
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/9fbd0eb61d9248d3a5dfdb3f3f9c9793
work_keys_str_mv	AT mariasofiahazarabedian theroleofnanosizedintergranularphasesonnickelalloy725brittlefailure AT marianoiannuzzi theroleofnanosizedintergranularphasesonnickelalloy725brittlefailure AT mariasofiahazarabedian roleofnanosizedintergranularphasesonnickelalloy725brittlefailure AT marianoiannuzzi roleofnanosizedintergranularphasesonnickelalloy725brittlefailure
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The role of nano-sized intergranular phases on nickel alloy 725 brittle failure

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