Influence of P and C Intergranular Segregation During Manufacturing and Ageing on the Fracture Toughness of Nuclear Pressure Vessel Steels☆

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Abstract

Mechanical tests on Charpy and CT specimens of a low alloy MnNiMo steel under two conditions, as received and thermally aged, revealed a shift of the ductile to brittle transition temperature. In this paper, an approach based on the combination of local fracture mechanics and segregation kinetics is proposed in order to describe this shift.

Keywords

Low alloy steels
thermal ageing
fracture
DBTT shift
intergranular
Phosphorus

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Selection and peer-review under responsibility of the Norwegian University of Science and Technology (NTNU), Department of Structural Engineering.

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