Temper embrittlement of 9%Ni low carbon steel and nondestructive inspection by magnetic Barkhausen noise

9% Ni and low carbon steel is used in cryogenic services in oil and gas industries. The final mechanical properties are adjusted by quenching and tempering heat treatments. However, the un-correct tempering may cause temper embrittlement, with drastic decrease of toughness at cryogenic temperatures....

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Autores principales:	Tavares Sérgio S.M., Neves Fernanda F., da Igreja Hugo R., Noris Leosdan F., Alves Odivaldo C., Pardal Juan Manuel
Formato:	article
Lenguaje:	EN FR
Publicado:	EDP Sciences 2021
Materias:	Engineering (General). Civil engineering (General) TA1-2040
Acceso en línea:	https://doaj.org/article/a2dba4cc548844c48da48fe8c07d06c7
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spelling	oai:doaj.org-article:a2dba4cc548844c48da48fe8c07d06c72021-12-02T17:13:46ZTemper embrittlement of 9%Ni low carbon steel and nondestructive inspection by magnetic Barkhausen noise2261-236X10.1051/matecconf/202134902020https://doaj.org/article/a2dba4cc548844c48da48fe8c07d06c72021-01-01T00:00:00Zhttps://www.matec-conferences.org/articles/matecconf/pdf/2021/18/matecconf_iceaf2021_02020.pdfhttps://doaj.org/toc/2261-236X9% Ni and low carbon steel is used in cryogenic services in oil and gas industries. The final mechanical properties are adjusted by quenching and tempering heat treatments. However, the un-correct tempering may cause temper embrittlement, with drastic decrease of toughness at cryogenic temperatures. In this study, specimens tempered at 350°C, 400°C and 450°C showed very low toughness at low temperature (-196°C) due to temper embrittlement. Specimens slowly cooled from the tempering temperature (565°C, 585°C and 605°C) also showed toughness reduction in comparison with specimens tempered at the same temperature and cooled in water. The brittle fracture was characterized by intergranular cracks and cleavage. Magnetic Barkhausen Noise (MBN) inspection was conducted to verify if this technique can be used to detect the temper embrittlement in 9Ni steels. The root mean square (RMS) of the MBN signal was higher in specimens as quenched and in specimens tempered in the temper embrittlement range (350°C-500°C) than in specimens which were correctly tempered (565°C-605°C and water cooled). Comparing specimens tempered at 565 and 585°C range and slowly cooled with those which were water cooled, the RMS(MBN) was higher in the former group, which presented the lower toughness. However, the MBN inspection could not separate specimens tempered at 605°C slowly and rapidly, which can be related to the higher austenite volume fraction measured in the specimen slowly cooled.Tavares Sérgio S.M.Neves Fernanda F.da Igreja Hugo R.Noris Leosdan F.Alves Odivaldo C.Pardal Juan ManuelEDP SciencesarticleEngineering (General). Civil engineering (General)TA1-2040ENFRMATEC Web of Conferences, Vol 349, p 02020 (2021)
institution	DOAJ
collection	DOAJ
language	EN FR
topic	Engineering (General). Civil engineering (General) TA1-2040
spellingShingle	Engineering (General). Civil engineering (General) TA1-2040 Tavares Sérgio S.M. Neves Fernanda F. da Igreja Hugo R. Noris Leosdan F. Alves Odivaldo C. Pardal Juan Manuel Temper embrittlement of 9%Ni low carbon steel and nondestructive inspection by magnetic Barkhausen noise
description	9% Ni and low carbon steel is used in cryogenic services in oil and gas industries. The final mechanical properties are adjusted by quenching and tempering heat treatments. However, the un-correct tempering may cause temper embrittlement, with drastic decrease of toughness at cryogenic temperatures. In this study, specimens tempered at 350°C, 400°C and 450°C showed very low toughness at low temperature (-196°C) due to temper embrittlement. Specimens slowly cooled from the tempering temperature (565°C, 585°C and 605°C) also showed toughness reduction in comparison with specimens tempered at the same temperature and cooled in water. The brittle fracture was characterized by intergranular cracks and cleavage. Magnetic Barkhausen Noise (MBN) inspection was conducted to verify if this technique can be used to detect the temper embrittlement in 9Ni steels. The root mean square (RMS) of the MBN signal was higher in specimens as quenched and in specimens tempered in the temper embrittlement range (350°C-500°C) than in specimens which were correctly tempered (565°C-605°C and water cooled). Comparing specimens tempered at 565 and 585°C range and slowly cooled with those which were water cooled, the RMS(MBN) was higher in the former group, which presented the lower toughness. However, the MBN inspection could not separate specimens tempered at 605°C slowly and rapidly, which can be related to the higher austenite volume fraction measured in the specimen slowly cooled.
format	article
author	Tavares Sérgio S.M. Neves Fernanda F. da Igreja Hugo R. Noris Leosdan F. Alves Odivaldo C. Pardal Juan Manuel
author_facet	Tavares Sérgio S.M. Neves Fernanda F. da Igreja Hugo R. Noris Leosdan F. Alves Odivaldo C. Pardal Juan Manuel
author_sort	Tavares Sérgio S.M.
title	Temper embrittlement of 9%Ni low carbon steel and nondestructive inspection by magnetic Barkhausen noise
title_short	Temper embrittlement of 9%Ni low carbon steel and nondestructive inspection by magnetic Barkhausen noise
title_full	Temper embrittlement of 9%Ni low carbon steel and nondestructive inspection by magnetic Barkhausen noise
title_fullStr	Temper embrittlement of 9%Ni low carbon steel and nondestructive inspection by magnetic Barkhausen noise
title_full_unstemmed	Temper embrittlement of 9%Ni low carbon steel and nondestructive inspection by magnetic Barkhausen noise
title_sort	temper embrittlement of 9%ni low carbon steel and nondestructive inspection by magnetic barkhausen noise
publisher	EDP Sciences
publishDate	2021
url	https://doaj.org/article/a2dba4cc548844c48da48fe8c07d06c7
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Temper embrittlement of 9%Ni low carbon steel and nondestructive inspection by magnetic Barkhausen noise

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