Identification of ductile to brittle transition temperature by using plane strain specimen in tensile test and correlation with instrumented Charpy impact test: experimental and numerical study

Frank Tioguem; Matthieu Mazière; Franck Tankoua; André Galtier; Anne-Françoise Gourgues-Lorenzon

Identification of ductile to brittle transition temperature by using plane strain specimen in tensile test and correlation with instrumented Charpy impact test: experimental and numerical study

Frank Tioguem ^{1, 2} Matthieu Mazière ¹ Franck Tankoua ² André Galtier ² Anne-Françoise Gourgues-Lorenzon ¹

Abstract : This study addresses the correlation between the ductile-to-brittle transition (DBT) temperature ranges of high strength 4140 steel obtained respectively from tensile tests under plane strain (PS) conditions and from conventional Charpy Impact tests. Specimens were taken respectively at 25 mm (P) and at 55 mm (M) from skin of a cylindrical 90-mm-radius hot rolled bar water quenched from 875°C, tempered at 600°C and air cooled. P and M samples respectively showed a fully martensitic and a martensite-bainite microstructure. Fracture surface observations showed good agreement for physical fracture mechanisms (cleavage facet size, mixed ductile + brittle fracture in the transition region, ductile fracture at higher temperatures) between PS and Charpy, in particular sensitivity of upper bainite to cleavage fracture that reduces fracture energy in the lower shelf-energy on Charpy tests.

Keywords : Charpy test notched plane-strain specimen Martensite-bainite carbides experimental and numerical study

Type de document :

Article dans une revue

Domaine :

Sciences de l'ingénieur [physics] / Mécanique [physics.med-ph] / Mécanique des matériaux [physics.class-ph]

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https://hal-mines-paristech.archives-ouvertes.fr/hal-01869103
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Soumis le : jeudi 6 septembre 2018 - 11:23:44
Dernière modification le : vendredi 15 février 2019 - 11:24:07
Document(s) archivé(s) le : vendredi 7 décembre 2018 - 15:32:40

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Identification of ductile to brittle transition temperature by using plane strain specimen in tensile test and correlation with instrumented Charpy impact test: experimental and numerical study

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Identification of ductile to brittle transition temperature by using plane strain specimen in tensile test and correlation with instrumented Charpy impact test: experimental and numerical study

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