Sensitization of as rolled and stable annealed Alloy 625

Roland Lackner; G Mori; R. Egger; F. Winter; Mihaela Albu; Werner Grogger

doi:10.1007/s00501-013-0225-x

Sensitization of as rolled and stable annealed Alloy 625

Titel in Übersetzung: Sensibilisierung von walzharten und stabil geglühten Alloy 625

Roland Lackner^*, G Mori, R. Egger, F. Winter, Mihaela Albu, Werner Grogger

^*Korrespondierende/r Autor/-in für diese Arbeit

Institut für Elektronenmikroskopie und Nanoanalytik (5190)

Publikation: Beitrag in einer Fachzeitschrift › Artikel › Begutachtung

Abstract

Alloy 625 wird als Auflagewerkstoff in der Öl- und Gasindustrie verwendet. Unterschiedliche Wärmebehandlungszustände (stabilgeglüht und walzhart) werden verwendet. Beide Zustände wurden in einem Laborofen isotherm wärmebehandelt (Wärmebehandlungstemperatur bis 1050 °C, Wärmebehandlungsdauer bis 10 h). Der Einfluss auf die interkristalline Korrosion wurde mittels Streicher-Tests (entsprechend ASTM G28A) und Double Loop – Electrochemical Potentiokinetic Reactivation Test (DL-EPR Test) bestimmt. Das Gefüge und die Form des Angriffs nach den Tests wurden mittels Rasterelektronenmikroskop (REM) untersucht. Ausscheidungen wurden mittel REM und Transmissionselektronenmikroskop charakterisiert. Konzentrationsprofile von Mo-reichen Ausscheidungen wurden auf ihren Einfluss auf die Sensibilisierung untersucht.

Titel in Übersetzung	Sensibilisierung von walzharten und stabil geglühten Alloy 625
Originalsprache	englisch
Seiten (von - bis)	12-22
Fachzeitschrift	Berg- und hüttenmännische Monatshefte
Jahrgang	149
Ausgabenummer	1
DOIs	https://doi.org/10.1007/s00501-013-0225-x
Publikationsstatus	Veröffentlicht - 2014

Fields of Expertise

Advanced Materials Science

Treatment code (Nähere Zuordnung)

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10.1007/s00501-013-0225-x

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abstract = "Alloy 625 is used as cladding material in the oil and gas industry. Different annealing conditions are used, these are stable annealed and as rolled. Both conditions have been isothermally sensitized in a laboratory resistance furnace. The annealing temperature was up to 1050 °C and the annealing time up to 10 h. Susceptibility to intergranular corrosion has been investigated by means of a conventional immersion tests according to ASTM G28A and the Double Loop—Electrochemical Potentiokinetic Reactivation Test (DL-EPR method). Scanning electron microscopy (SEM) was used to evaluate microstructure and type of attack after testing. The chemical composition of precipitated phases was characterized by SEM and Transmission Electron Microscopy (TEM). High-resolution investigations with concentration profiles proved high molybdenum precipitates to determine the degree of sensitization.",

author = "Roland Lackner and G Mori and R. Egger and F. Winter and Mihaela Albu and Werner Grogger",

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doi = "10.1007/s00501-013-0225-x",

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T1 - Sensitization of as rolled and stable annealed Alloy 625

AU - Lackner, Roland

AU - Mori, G

AU - Egger, R.

AU - Winter, F.

AU - Albu, Mihaela

AU - Grogger, Werner

PY - 2014

Y1 - 2014

N2 - Alloy 625 is used as cladding material in the oil and gas industry. Different annealing conditions are used, these are stable annealed and as rolled. Both conditions have been isothermally sensitized in a laboratory resistance furnace. The annealing temperature was up to 1050 °C and the annealing time up to 10 h. Susceptibility to intergranular corrosion has been investigated by means of a conventional immersion tests according to ASTM G28A and the Double Loop—Electrochemical Potentiokinetic Reactivation Test (DL-EPR method). Scanning electron microscopy (SEM) was used to evaluate microstructure and type of attack after testing. The chemical composition of precipitated phases was characterized by SEM and Transmission Electron Microscopy (TEM). High-resolution investigations with concentration profiles proved high molybdenum precipitates to determine the degree of sensitization.

AB - Alloy 625 is used as cladding material in the oil and gas industry. Different annealing conditions are used, these are stable annealed and as rolled. Both conditions have been isothermally sensitized in a laboratory resistance furnace. The annealing temperature was up to 1050 °C and the annealing time up to 10 h. Susceptibility to intergranular corrosion has been investigated by means of a conventional immersion tests according to ASTM G28A and the Double Loop—Electrochemical Potentiokinetic Reactivation Test (DL-EPR method). Scanning electron microscopy (SEM) was used to evaluate microstructure and type of attack after testing. The chemical composition of precipitated phases was characterized by SEM and Transmission Electron Microscopy (TEM). High-resolution investigations with concentration profiles proved high molybdenum precipitates to determine the degree of sensitization.

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DO - 10.1007/s00501-013-0225-x

M3 - Article

SN - 1613-7531

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JO - Berg- und hüttenmännische Monatshefte

JF - Berg- und hüttenmännische Monatshefte

IS - 1

ER -

Sensitization of as rolled and stable annealed Alloy 625

Abstract

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