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This project has received funding from the Research Fund

for Coal and Steel under grant agreement No 101034039 

Optimisation of high damage tolerance at very high strengths by the quenching and partitioning process

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The
challenge

The objective of the project is to investigate the applicability of Quenching and Partitioning (QP) processes into thick components aiming at keeping or improving the performance of damage tolerance, mainly in terms of toughness and low cycle fatigue, in relatively large section components which currently uses quenching and tempering steels. For this purpose, careful selection of the chemical composition will be proposed taking account fine tuning of the QP parameters, the industrial processing windows in heat treatment and the microstructural gradient to be promoted across the component section. Modelling tools will be used for microstructural and mechanical prediction

 Project objectives

01

Design a steel that, having the

considered dimensions and after

application of optimum QP

processing, leads to Rm of 2000

MPa, yield stress of 1500 MPa

while maintaining adequate

toughness (elongation larger

than 12-15%) and adequate

tolerance to damage in terms

of fracture toughness, fatigue

response and wear

02

Develop and validate a model

for the microstructure

development through

thickness of large-section

steel components. This model

will allow the selection of

optimum QP processing

parameters in thick components

different to the ones evaluated

in this project

03

Evaluate the industrial feasibility and life cycle assessment associated to the application of QP processing to thick components in comparison with typical quenching and tempering treatments

The solution

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With the collaboration of

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Coordinated by

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